Institut für Psychologie
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When a key press causes a stimulus, the key press is perceived later and the stimulus earlier than key presses and stimuli presented independently. This bias in time perception has been linked to the intention to produce the effect and thus been called intentional binding (IB). In recent studies it has been shown that the IB effect is stronger when participants believed that they caused the effect stimulus compared to when they believed that another person caused the effect (Desantis et al., 2011). In this experiment we ask whether causal beliefs influence the perceived time of an effect when the putative effect occurs temporally close to another stimulus that is also an effect. In our study two participants performed the same task on connected computers with separate screens. Each trial started synchro- nously on both computers. When a participant pressed a key, a red and a yellow stimulus appeared as action effects simultaneously or with a slight delay of up to 50 ms. The partic- ipants’ task was to judge the temporal order of these two effect stimuli. Participants were either told that one participant caused one of the two stimuli while the other participant seated at the other computer caused the other stimulus, or each participant was told that he/she caused both stimuli. The different causal beliefs changed the perceived time of the effects’ appearance relative to each other. When participants believed they each caused one effect, their “own” effect was perceived earlier than the other participant’s effect. When the participants believed each caused both effects, no difference in the perceived temporal order of the red and yellow effect was found. These results confirm that higher order causal beliefs change the perceived time of an action effect even in a setting in which the occurrence of the putative effect can be directly compared to a reference stimulus.
Flexible behavior is only possible if contingencies between own actions and following environmental effects are acquired as quickly as possible; and recent findings indeed point toward an immediate formation of action-effect bindings already after a single coupling of an action and its effect. The present study explored whether these short-term bindings occur for both, stimulus- and goal-driven actions (“forced-choice actions” vs. “free-choice actions”). Two experiments confirmed that immediate action-effect bindings are formed for both types of actions and affect upcoming behavior. These findings support the view that action-effect binding is a ubiquitous phenomenon which occurs for any type of action.
Previous research using neuroimaging methods proposed a link between mechanisms controlling motor response inhibition and suppression of unwanted memories.The present study investigated this hypothesis behaviorally by combining the think/no-think paradigm (TNT) with a go/no-go motor inhibition task. Participants first learned unpleasant cue-target pairs. Cue words were then presented as go or no-go items in the TNT. Participants’ task was to respond to the cues and think of the target word aloud or to inhibit their response to the cue and the target word from coming to mind. Cued recall assessed immediately after the TNT revealed reduced recall performance for no-go targets compared to go targets or baseline cues not presented in the TNT. The results demonstrate that doing the no-think and no-go task concurrently leads to memory suppression of unpleasant items during later recall. Results are discussed in line with recent empirical research and theoretical positions.
Introduction: Sleep disturbances are common in adolescents and adversely affect performance, social contact, and susceptibility to stress. We investigated the hypothesis of a relationship between sleep and health-related quality of life (HRQoL), and applied self- and proxy ratings. Materials and Methods: The sample comprised 92 adolescents aged 11–17 years. All participants and their parents completed a HRQoL measure and the Sleep Disturbance Scale for Children (SDSC ). Children with SDSC T -scores above the normal range (above 60) were classified as poor sleepers. Results: According to self- and proxy ratings, good sleepers reported significantly higher HRQoL than poor sleep- ers. Sleep disturbances were significantly higher and HRQoL significantly lower in self- as compared to parental ratings. Parent-child agreement was higher for subscales measuring observable aspects. Girls experienced significantly stronger sleep disturbances and lower self-rated HRQoL than boys. Discussion: Our findings support the positive relationship of sleep and HRQoL. Furthermore, parents significantly underestimate sleep disturbances and overestimate HRQoL in their children.
A brain-computer interface (BCI) enables communication without movement based on brain signals measured with electroencephalography (EEG). BCIs usually rely on one of three types of signals: the P300 and other components of the event-related potential (ERP), steady state visual evoked potential (SSVEP), or event related desynchronization (ERD). Although P300 BCIs were introduced over twenty years ago, the past few years have seen a strong increase in P300 BCI research. This closed-loop BCI approach relies on the P300 and other components of the ERP, based on an oddball paradigm presented to the subject. In this paper, we overview the current status of P300 BCI technology, and then discuss new directions: paradigms for eliciting P300s; signal processing methods; applications; and hybrid BCIs. We conclude that P300 BCIs are quite promising, as several emerging directions have not yet been fully explored and could lead to improvements in bit rate, reliability, usability, and flexibility.
Numerous studies have shown that humans automatically react with congruent facial reactions, i.e., facial mimicry, when seeing a vis-á-vis’ facial expressions. The current experiment is the first investigating the neuronal structures responsible for differences in the occurrence of such facial mimicry reactions by simultaneously measuring BOLD and facial EMG in an MRI scanner. Therefore, 20 female students viewed emotional facial expressions (happy, sad, and angry) of male and female avatar characters. During picture presentation, the BOLD signal as well as M. zygomaticus major and M. corrugator supercilii activity were recorded simultaneously. Results show prototypical patterns of facial mimicry after correction for MR-related artifacts: enhanced M. zygomaticus major activity in response to happy and enhanced M. corrugator supercilii activity in response to sad and angry expressions. Regression analyses show that these congruent facial reactions correlate significantly with activations in the IFG, SMA, and cerebellum. Stronger zygomaticus reactions to happy faces were further associated to increased activities in the caudate, MTG, and PCC. Corrugator reactions to angry expressions were further correlated with the hippocampus, insula, and STS. Results are discussed in relation to core and extended models of the mirror neuron system (MNS).
Brain–computer interfaces (BCI) based on event-related potentials (ERP) allow for selection of characters from a visually presented character-matrix and thus provide a communica- tion channel for users with neurodegenerative disease. Although they have been topic of research for more than 20 years and were multiply proven to be a reliable communication method, BCIs are almost exclusively used in experimental settings, handled by qualified experts. This study investigates if ERP–BCIs can be handled independently by laymen without expert support, which is inevitable for establishing BCIs in end-user’s daily life situations. Furthermore we compared the classic character-by-character text entry against a predictive text entry (PTE) that directly incorporates predictive text into the character- matrix. N = 19 BCI novices handled a user-centered ERP–BCI application on their own without expert support. The software individually adjusted classifier weights and control parameters in the background, invisible to the user (auto-calibration). All participants were able to operate the software on their own and to twice correctly spell a sentence with the auto-calibrated classifier (once with PTE, once without). Our PTE increased spelling speed and, importantly, did not reduce accuracy. In sum, this study demonstrates feasi- bility of auto-calibrating ERP–BCI use, independently by laymen and the strong benefit of integrating predictive text directly into the character-matrix.
Background: A solid diagnosis of sleep disorders in children should include both self-ratings and parent ratings. However, there are few standardized self-assessment instruments to meet this need. The Children’s Sleep Comic is an adapted version of the unpublished German questionnaire “Freiburger Kinderschlafcomic” and provides pictures for items and responses. Because the drawings were outdated and allowed only for qualitative analysis, we revised the comic, tested its applicability in a target sample, and suggest a procedure for quantitative analysis. Methods: All items were updated and pictures were newly drawn. We used a sample of 201 children aged 5–10 years to test the applicability of the Children’s Sleep Comic in young children and to run a preliminary analysis. Results: The Children’s Sleep Comic comprises 37 items covering relevant aspects of sleep disorders in children. Application took on average 30 minutes. The procedure was well accepted by the children, as reflected by the absence of any dropouts. First comparisons with established questionnaires indicated moderate correlations. Conclusion: The Children’s Sleep Comic is appropriate for screening sleep behavior and sleep problems in children. The interactive procedure can foster a good relationship between the investigator and the child, and thus establish the basis for successful intervention if necessary.
We examined whether movement costs as defined by movement magnitude have an impact on distance perception in near space. In Experiment 1, participants were given a numerical cue regarding the amplitude of a hand movement to be carried out. Before the movement execution, the length of a visual distance had to be judged. These visual distances were judged to be larger, the larger the amplitude of the concurrently prepared hand movement was. In Experiment 2, in which numerical cues were merely memorized without concurrent movement planning, this general increase of distance with cue size was not observed. The results of these experiments indicate that visual perception of near space is specifically affected by the costs of planned hand movements.
Aufgabenstellung dieser Arbeit ist die Prozessdarstellung des Kompetenzerwerbs im Umgang mit menügesteuerten Informationssystemen (kurz: Menüsysteme) im Fahrzeug. Hierzu zählen die Darstellung des Lernverlaufs sowie der Bedeutung von förderlichen und hinderlichen Lernbedingungen. Als ein Schwerpunkt der Arbeit werden mentale Repräsentationen der Nutzer bezüglich des Menüsystems betrachtet. Zusätzlich wird die Kompatibilität des Kompetenzerwerbs für Menüsysteme mit der Fahrzeugführung geprüft. Aus diesen Analysen ergeben sich Methoden der Überprüfung des Lernaufwands, -verlaufs und -erfolgs. Zur empirischen Überprüfung werden prototypische Menüsysteme konstruiert. Anhand sog. Raumschiff-Systeme wird z.B. der Umgang des Nutzers mit einem begrifflich weitgehend eindeutigen Menüsystem eines Raumschiffs der Bedienung eines Menüsystems ohne bedeutungshaltige Informationen (sog. System sinnloser Silben) gegenübergestellt. Um die Auswirkungen des Kompetenzerwerbs für Menüsysteme auf die Fahrsicherheit zu untersuchen, werden fahrkontextnahe Systeme konzipiert. Diese werden sowohl unter Single-Task Bedingungen (z.B. an einem Bildschirmarbeitsplatz, im stehenden Fahrzeug) als auch unter Dual-Task Bedingungen (z.B. während der Fahrt) bedient. Zielsetzung weiterer Explorationsstudien ist die Analyse der zeitlichen Struktur einer Bedienhandlung in einem Menüsystem in Abhängigkeit des Kompetenzerwerbs. Insgesamt werden sechs Hauptstudien und fünf Explorationsstudien in dieser Arbeit berichtet. Es wird gezeigt, dass der Kompetenzerwerb für Menüsysteme dem sog. Potenzgesetz der Übung folgt: So findet sich zu Übungsbeginn ein starker Leistungsanstieg im Umgang mit einem Menüsystem unter Single-Task Bedingungen, in späteren Übungsphasen verringert sich dieser Leistungsanstieg. Das erzielte Leistungsniveau in der Menübedienung ist nach einer längeren Lernpause (von bis zu 12 Wochen) weitgehend stabil. Zu Übungsbeginn treten v.a. Orientierungs- und Bedienfehler auf, in späteren Übungsphasen vermehrt Flüchtigkeitsfehler. Diese Fehler stellen voneinander unabhängige Fehlerklassen dar. Zu Lernbeginn ist v.a. die Bediengenauigkeit von Bedeutung, mit zunehmender Übung die Bediengeschwindigkeit. Insbesondere antizipative Aspekte der Handlungsvorbereitung und -initiierung im Umgang mit Menüsystemen sind Lerneinflüssen zugänglich. Für exekutive Aspekte der Handlungsdurchführung und -kontrolle ist der Kompetenzerwerb von untergeordneter Bedeutung. Als Nutzermerkmale erweisen sich das bereichsspezifische Vorwissen, die kognitive Leistungsfähigkeit und das Nutzeralter als bedeutsam: Diese Merkmale werden mit zunehmender Übung weniger wichtig für interindividuelle Leistungsunterschiede. Die realisierten Systemvariationen eines Menüsystems (Menüstruktur und Bedienmodell) wirken sich unabhängig vom Lernstatus auf das Bedienverhalten der Systemnutzer aus. Auf Nutzerseite werden im Umgang mit einem Menüsystem mentale Repräsentationen konstruiert: Zu Lernbeginn wird insbesondere begriffliches Wissen (sog. Inhaltsstruktur und begriffliche Unterbegriffs-Oberbegriffs-Relationen) angeeignet. Mit zunehmender Übung wird eine räumliche Repräsentation, in der die Positionen der einzelnen Menüinhalte abgebildet sind, aufgebaut. Eine motorische Repräsentation als Resultat einer Optimierung des Umgangs mit dem Bedienelement bis hin zu einer (Teil-)Automatisierung der motorischen Handlungssequenz wird erst nach umfangreicher Übung im Umgang mit einem Menüsystem erworben. Diese Repräsentationen beeinflussen wiederum die Bedienleistung: Zu Übungsbeginn ist z.B. das Erkennen der sog. Inhaltsstruktur für die starken Lernzuwächse verantwortlich. Die Kompatibilität von Vorwissen auf Nutzerseite und für die Bedienung notwendiges Systemwissen bestimmt den Lernaufwand und –verlauf. Die Veränderung räumlicher Positionen von Menüinhalten geht mit Einbußen in der Bedienleistung einher. Personen mit präzisem räumlichem Wissen können effizienter mit einem Menüsystem umgehen. Bedienfehler treten v.a. zu Übungsbeginn auf. Mit zunehmender Übung wird der sensumotorische Umgang mit dem Bedienelement optimiert. Diese Befunde führen zu folgenden Schlussfolgerungen: (1) Der Umgang mit Menüsystemen führt zu einer trialen Kodierung der für die Menübedienung notwendigen Informationen. (2) Das Potenzgesetz der Übung beschreibt den Kompetenzerwerb für Menüsysteme lediglich summativ und resultiert aus der Kombination der einzelnen Lernfunktionen der zu kodierenden Lerninhalte. Unter Dual-Task Bedingungen treten zu Übungsbeginn stärkere Interferenzen zwischen Fahrzeugführung und Menübedienung auf. Mit zunehmender Übung verringern sich diese Interferenzen v.a. auf Seiten der Menübedienung. Dies ist u.a. auf die Instruktion der Probanden zurückzuführen. Übungsbedingt schauen die Nutzer seltener bei vergleichbarer Blickdauer auf das Systemdisplay. Insbesondere ältere Nutzer haben Probleme mit einer Verschränkung von Fahrzeugführung und Menübedienung. Mit zunehmender Übung verringern sich diese Alterseffekte, werden aber nicht eliminiert. Wird ein Menüsystem parallel zur Fahrzeugführung bedient, werden zudem stärkere und präzisere begriffliche und räumliche Repräsentationen über das Menüsystem vom Nutzer konstruiert. Bei diesen Studien wird ein multimethodaler Messansatz verfolgt, in dem verschiedenartige Werkzeuge zur Bestimmung des Kompetenzerwerbs und seiner Wirkungen auf die Fahrsicherheit eingesetzt werden. Es kann dabei zu einer Dissoziation der Ergebnisse in verschiedenen Messmethoden kommen. Unter Single-Task Bedingungen gewonnene Ergebnisse können nicht ohne weiteres auf Dual-Task Bedingungen generalisiert werden.
The aim of this study was both to investigate the influence of cognitive control on unconscious processing, and to investigate the influence of unconscious processing on cognitive control. At first, different mechanisms and accounts to explain unconscious priming are presented. Here, perceptual and motor processes, as well as stimulus-response learning, semantic categorization, and the action trigger account as theories to explain motor priming are discussed. Then, the issue of the potential limits of unconscious processing is presented. Findings that indicate that active current intentions and expertise modulate unconscious processing are illustrated. Subsequently, results that imply an influence of unconsciously presented stimuli that goes beyond motor processes are discussed, with a special focus on inhibition processes, orienting of attention, task set activation, and conflict adaptation. Then I present the results of my own empirical work. Experiment 1 shows that the effective processing of unconsciously presented stimuli depends on expertise, even when potentially confounding difference between the expert and novice groups are controlled. The results of Experiments 2 and 3 indicate that the intention to use particular stimuli is a crucial factor for the effectiveness of these stimuli when they are presented unconsciously. Additionally, these findings show that shifts of attention can be triggered by centrally presented masked arrow cues. Experiments 4 and 5 broaden these results to cue stimuli that are not inherently associated with a spatial meaning. The finding corroborate that typically endogenously controlled shifts of attention can also be induced by unconscious stimuli. Experiments 6 and 7 demonstrate that even a central cognitive control process like task set activation is not contingent on conscious awareness, but can in contrast be triggered through unconscious stimulation. Finally, these results are integrated and I discuss how the concept of cognitive control and the limits of unconscious processing may have to be reconsidered. Furthermore, potential future research possibilities in this field are presented.
In 1999, a tragic catastrophe occurred in the Mont Blanc Tunnel, one of the most important transalpine road tunnels. Twenty-seven of the victims never left their vehicles as a result of which they were trapped in smoke and suffocated (Beard & Carvel, 2005). Immediate evacuation is crucial in tunnel fires, but still many tunnel users stay passive. During emergency situations people strongly influence each other’s behavior (e.g. Nilsson & Johansson, 2009a). So far, only few empirical experimental studies investigated the interaction of individuals during emergencies. Recent developments of advanced immersive virtual worlds, allow simulating emergency situations which makes analogue studies possible. In the present dissertation project, theoretical aspects of human behavior and SI in emergencies are addressed (Chapter 1). The question of Social Influence in emergency situations is investigated in five simulation studies during different relevant stages of the evacuation process from a simulated road tunnel fire (Chapter 2). In the last part, the results are discussed and criticized (Chapter 3). Using a virtual reality (VR) road tunnel scenario, study 1 (pilot study) and 2 investigated the effect of information about adequate behavior in tunnel emergencies as well as Social Influence (SI) on drivers’ behavior. Based on a classic study of Darley and Latané (1968) on bystander inhibition, the effect of passive bystanders on self-evacuation was analyzed. Sixty participants were confronted with an accident and smoke in a road tunnel. The presence of bystanders and information status was manipulated and consequently, participants were randomly assigned into four different groups. Informed participants read a brochure containing relevant information about safety behavior in emergency situations prior to the tunnel drives. In the bystander conditions, passive bystanders were situated in a car in front of the emergency situation. Participants who had received relevant information left the car more frequently than the other participants. Neither significant effect of bystanders nor interaction with information status on the participants’ behavior was observed. Study 3 (pilot study) examined a possible alternative explanation for weak SI in VR. Based on the Threshold Theory of Social Influence (Blascovich, 2002b) and the work of Guadagno et al. (2007), the perception of virtual humans as an avatar (a virtual representation of a real human being) or as an agent (a computer-controlled animated character) was manipulated. Subsequently, 32 participants experienced an accident similar to the one in study 1. However, they were co-drivers and a virtual agent (VA) was the driver. Participants reacted differently in avatar and agent condition. Consequently, the manipulation of the avatar condition was implemented in study 4. In study 4, SI within the vehicle was investigated, as drivers are mostly not alone in their car. In a tunnel scenario similar to the first study, 34 participants were confronted with an emergency situation either as drivers or co-drivers. In the driver group, participants drove themselves and a VA was sitting on the passenger seat. Correspondently, participants in the co-driver group were seated on the passenger seat and the VA drove the vehicle on a pre-recorded path. Like in study 1, the tunnel was blocked by an accident and smoke was coming from the accident in one drive. The VA initially stayed inactive after stopping the vehicle but started to evacuate after ca. 30 seconds. About one third of the sample left the vehicle during the situation. There were no significant differences between drivers and co-drivers regarding the frequency of leaving the vehicle. Co-drivers waited significantly longer than drivers before leaving the vehicle. Study 5 looked at the pre-movement and movement phase of the evacuation process. Forty participants were repeatedly confronted with an emergency situation in a virtual road tunnel filled with smoke. Four different experimental conditions systematically varied the presence and behavior of a VA. In all but one conditions a VA was present. Across all conditions at least 60% of the participants went to the emergency exit. If the VA went to the emergency exit, the ratio increased to 75%. If the VA went in the opposite direction of the exit, however, only 61% went there. If participants were confronted with a passive VA, they needed significantly longer until they started moving and reached the emergency exit. The main and most important finding across all studies is that SI is relevant for self-evacuation, but the degree of SI varies across the phases of evacuation and situation. In addition to the core findings, relevant theoretical and methodological questions regarding the general usefulness and limitations of VR as a research tool are discussed. Finally, a short summary and outlook on possible future studies is presented.
Renewal of fear is one form of relapse that occurs after successful therapy, resulting from an encounter with a feared object in a context different from the context of the exposure therapy. According to Bouton (1994), the return of fear, provoked by context change, indicates that the fear was not erased in the first place. More importantly, the return of fear indicates that during the exposure session a new association was learned that connected the feared object with “no fear”; yet, as Bouton further argues, this association is context dependent. Such dependence could explain effects like renewal. In a new context, the therapeutic association will not be expressed and thus will no longer inhibit the fear. The assumption that an association is context dependent has been tested and showed robust results (Balooch & Neumann, 2011; Siavash Bandarian Balooch, Neumann, & Boschen, 2012; Culver, Stoyanova, & Craske, 2011; Kim & Richardson, 2009; Neumann & Kitlertsirivatana, 2010). Research for the treatment of anxiety disorders, aiming to reduce fear and, more importantly, prevent relapse, is flourishing. There are several exposure protocols currently under investigation: multiple contexts exposure (MCE), which aims at reducing the return of fear due to renewal (e.g., Balooch & Neumann, 2011); prolonged exposure (PE), which aims at strengthening the inhibitory association during the extinction learning (e.g., Thomas, Vurbic, & Novak, 2009); and reconsolidation update (RU), which aims at “updating” the reconsolidation process by briefly exposing the CS+ before the actual extinction takes place (Schiller et al., 2010). So far, however, few clinical studies conducted on humans have investigated these novel treatment protocols, and as far as I know none has investigated the mechanisms of action behind these protocols with a human clinical sample. The present thesis has three main goals. The first is to demonstrate that exposure therapy in multiple contexts reduces the likelihood of renewal. The second is to examine the mechanisms contributing to the effect of MCE and the third is to shed light on the concept of context in the framework of the conditioning and extinction paradigm. To this end, three studies were conducted. The first study investigated the effect of MCE on renewal, the second and third studies examined working mechanisms of MCE. In the first study thirty spider-phobic participants were exposed four times to a virtual spider. The exposure trials were conducted either in one single context or in four different contexts. Finally, all participants completed both a virtual renewal test, with the virtual spider presented in a novel virtual context, and an in vivo behavioral avoidance test with a real spider. This study successfully demonstrated the efficacy of MCE on reducing renewal. Study 2 investigated the working mechanisms behind MCE by utilizing a differential conditioning paradigm and conducting the extinction in multiple contexts, targeting similar renewal attenuation as achieved in study 1. This was followed by two tests that attempted to reveal extinction-relevant associations like ones causing context inhibitory effects. This study had three main hypotheses: (1) The extinction context is associated with the exposure, and thus operates as a safety signal at some point during the extinction; it will therefore compete with the safety learning of the CS, leading to a decreased extinction effect on the CS if the extinction is conducted in only one context. (2) The elements (e.g., room color, furniture) of the extinction context are connected to the therapeutic association and therefore should serve as reminders of the extinction, causing a stronger fear inhibition when presented during a test. (3) Therapy process factors, according to emotional processing theory, determine the renewal effect (e.g., initial fear activation, and within-session and between-session activation are correlated with the strength of renewal). In this study, however, no differences between the groups at the renewal phase were observed, presumably because the extinction was too strong to enable a renewal of fear at the test phase conducted immediately following the extinction. This hence rendered the two inhibitory tests useless. Study 3 aimed at defining the concept of context in the conditioning and exposure framework. Study 3 utilized the phenomenon known as generalization decrement, whereby a conditioned response is reduced due to change in the environment. This allowed context similarity to be quantified. After an acquisition phase in one context, participants were tested in one of three contexts, two of which differed in only one dimension (configuration of objects vs. features). The third group was tested in the same context and served as control group. The goal was to show that both configuration and features play an important role in the definition of context. There was, however, no significant statistical difference between the groups at the test phases, likely because of context novelty effects (participants exposed to a new context following extinction in another context expected a second extinction phase, and thus demonstrated greater fear than expected in all three groups).
Ziel der vorliegenden Arbeit ist es, herauszufinden, wie sich die Motivation bei Schülerinnen und Schülern in speziellen homogenen Begabtenklassen verglichen mit regulären Schulklassen entwickelt. Dazu wurden im Rahmen des „Projekts zur Untersuchung des Lernens in der Sekundarstufe“ (PULSS-Projekt) zu vier Messzeitpunkten die Leistungs- und Lernzielorientierung sowie die intrinsische Motivation in Mathematik und Deutsch erfasst. Der Untersuchungszeitraum erstreckte sich vom Beginn der 5. Jahrgangsstufe bis zum Ende der 7. Klasse. Um eine größtmögliche Vergleichbarkeit der Begabten- und der Regelklässler zu gewährleisten, wurden die Stichproben anhand entscheidender Merkmale parallelisiert (Schule, Geschlecht, IQ, sozioökonomischer Status). Die statistische Auswertung bestätigte den Rückgang der Motivation aller Schülerinnen und Schüler über die vier Messzeitpunkte hinweg. Darüber hinaus zeigten sich keine bedeutsamen Unterschiede zwischen den beiden Klassentypen. Differenzierte man in den einzelnen Klassen nach Schülerinnen und Schülern unterschiedlicher Begabung, so zeigte sich, dass die Ausprägung der Intelligenz keinen Einfluss auf die Höhe der Motivation nimmt. Beim akademischen Selbstkonzept verhält es sich teilweise anders. Wurde neben dem Klassentyp zwischen Schülerinnen und Schülern mit hohem und solchen mit niedrigem akademischen Selbstkonzept unterschieden, so war bei einigen Kennwerten die Höhe der Motivation in den Begabtenklassen stärker vom Selbstkonzept beeinflusst als in den Regelklassen. Dies äußerte sich dahingehend, dass die Begabtenklässler mit hohem akademischem Selbstkonzept verhältnismäßig stark motiviert waren, wohingegen die Begabtenklässler mit niedrigem akademischem Selbstkonzept die geringste Motivation zeigten. Eine abschließende Bewertung dieser Entwicklung kann aufgrund der in vorliegender Arbeit gefundenen Ergebnisse jedoch nicht vorgenommen werden. Insgesamt konnte die Befürchtung eines ungünstigeren Entwicklungsverlaufs in begabungshomogenen Klassen widerlegt werden. Das Ausmaß, inwieweit einzelne Schülerinnen und Schüler von der Beschulung in Begabtenklassen profitieren, scheint hinsichtlich der motivationalen Entwicklung nicht so sehr von der Intelligenz, sondern vielmehr von nicht-kognitiven Persönlichkeitsfaktoren abzuhängen. So legen die Resultate nahe, die Ausprägung des akademischen Selbstkonzepts bei Auswahlverfahren stärker zu berücksichtigen.
The aim of the present piece of work was to give information about the frequency of psychoactive substances within the German driver population and to identify preventive and promotive circumstances of drug driving. Furthermore, a new methodological approach to gather and link data about the consumption of psychoactive substances and the mobility of drug users is shown. Traditionally, roadside surveys are conducted to estimate the prevalence of drug driving within a population. By the present study, an alternative method is introduced. In total, 195 drug users (mainly cannabis users) and 100 controls out of the normal driving population were queried for four weeks about their driving and drug consumption behaviour by a questionnaire that was deployed on smartphones. The prevalences of drug driving within the sample were extrapolated into representative values. Because the subjects reported all daily activities within the study-period, it was also possible to describe situations in which the subjects decided against driving under influence. Besides, relevant previous experiences, attitudes, the approval of legal regulations, other traffic-specific parameters, social influences and personality variables were queried. So, individual factors that are associated with drug driving can be specified. The results are integrated in a model that shows dependencies of different societal, behavioural and legal variables. They can serve as major input to the discussion on drug driving and can be of practical use for rehabilitation and prevention purposes. The results can be summarised as follows: - Compared to the results of a German roadside survey from 1994, the prevalences that are found within the present study seem pretty low. This finding is discussed and possible explanations for the described trend are lined out. Furthermore, the prevalences that were calculated in the present study are compared to current data from other European countries. - The results show differences between users and controls on several variables. The differences indicate that substance use impacts on the structuring of day-to-day life. Overall, the controls’ days proceed more along a daily working routine than the users’ (e.g. less mobility at night, more mobility at rush-hour, alcohol consumption mainly at nights out). - The individual extent to which drugs are consumed differs dependent on daytime, day of the week and kind of substance. Of course, these dependencies also influence the occurrence of drug driving. Other factors of influence on drug driving are the distance, the availability of alternative modes of transport as well as the presence of female companions. - Not everybody who uses drugs drives under the influence of drugs. A striking predictor for frequent drug driving and highly intoxicated driving is a high consumption, associated with risky consumption patterns and a low subjective feeling of impairment after drug consumption. - The subjects’ attitudes towards drug driving and their beliefs about social norms largely go in line with the behaviour they engage in. Drug users have rather liberal attitudes towards drug use and driving under influence. - A possible deterrence effect of sanctioning and police enforcement and its dependence on the acceptance and awareness of the measures is delineated. - Only small effects are found when examining the objective impairment that is caused by drug use by a computer-based test battery. This result is critically discussed with regards to the operationalisation of the study groups. - Except from driving under influence, there is no evidence to suggest that DUI offenders also show problematic behaviour according to other traffic-related measures. - Parents and peers may have an influence as role models on the development of problematic behaviour. A good relationship between parents and children may have a positive impact on the development of conventional values and behaviour. - Drug use is associated with some crucial personality dimensions and drugs are often used to solve personal problems. A less precise but similar difference was found for users who commit many drives under influence compared to users who never or only sometimes drive under influence. Moreover, users marginally more often have psychological problems compared to controls. Finally, the strengths and weaknesses of the new methodological approach of data collection are discussed as well as the challenges that are faced when implementing it. All in all, it has proved to be a promising method and should serve as a standard to which future studies should aspire.
The present study investigated event-related brain potentials elicited by true and false negated statements to evaluate if discrimination of the truth value of negated information relies on conscious processing and requires higher-order cognitive processing in healthy subjects across different levels of stimulus complexity. The stimulus material consisted of true and false negated sentences (sentence level) and prime-target expressions (word level). Stimuli were presented acoustically and no overt behavioral response of the participants was required. Event-related brain potentials to target words preceded by true and false negated expressions were analyzed both within group and at the single subject level. Across the different processing conditions (word pairs and sentences), target words elicited a frontal negativity and a late positivity in the time window from 600–1000 msec post target word onset. Amplitudes of both brain potentials varied as a function of the truth value of the negated expressions. Results were confirmed at the single-subject level. In sum, our results support recent suggestions according to which evaluation of the truth value of a negated expression is a time- and cognitively demanding process that cannot be solved automatically, and thus requires conscious processing. Our paradigm provides insight into higher-order processing related to language comprehension and reasoning in healthy subjects. Future studies are needed to evaluate if our paradigm also proves sensitive for the detection of consciousness in non-responsive patients.
Just do it! Guilt as a moral intuition to cooperate - A parallel constraint satisfaction approach
(2011)
After a long dominance of rational models of judgment and decision-making in moral psychology (e.g. Kohlberg, 1969) there is now a strong interest in how intuitions and emotions influence moral judgments and decisions (e.g. Greene, 2007; Haidt, 2001; Monin, Pizarro, & Beer, 2007). In the literature, the influence of emotions on moral decisions is explained by heuristic or non-compensatory information processing (e.g. Sinnott-Armstrong, Young, & Cushman, 2010; Sunstein, 2005; Tobler, Kalis, & Kalenscher, 2008). However, the process of emotion elicitation is ignored. Appraisal theories postulate that emotion elicitation is due to the incoherence (or discrepancy) of behavioral representations like goals and actions (Moors, 2009). Emotion elicitation and intuitive decision-making can be combined if both processes apply a connectionist information processing structure (e.g. Barnes & Thagard, 1996). The current work contrasts both perspectives of intuitive-emotional decision-making with respect to guilt and cooperation.
The wardrobe malfunction—an unanticipated exposure of bodily parts in the public—has become a prevailing issue in concerts, shows and other celebrity events that is reliably reported by the media. The internet as the fastest source for celebrity gossip allows measuring the impact of such wardrobe malfunctions on the public in-terest in a celebrity. This measurement in turn allows conclusions about intention, motivation, and internet be-haviour of a wide variety of internet users. The present study exemplifies the use of an innovative non-reactive measure of active interest—the Search Volume Index—to assess the impact of a variety of internet-related phe-nomena, including wardrobe malfunctions. Results indicate that interest in a celebrity increases immediately af-ter such an event and stays at a high level for about three weeks (the wardrobe plateau). This special form of ce-lebrity gossip thus meets a constant interest of a substantial proportion of internet users.
Brain–computer interfaces (BCIs) enable paralyzed patients to communicate; however, up to date, no creative expression was possible. The current study investigated the accuracy and user-friendliness of P300-Brain Painting, a new BCI application developed to paint pictures using brain activity only. Two different versions of the P300-Brain Painting application were tested: A colored matrix tested by a group of ALS-patients (n = 3) and healthy participants (n = 10), and a black and white matrix tested by healthy participants (n = 10). The three ALS-patients achieved high accuracies; two of them reaching above 89% accuracy. In healthy subjects, a comparison between the P300-Brain Painting application (colored matrix) and the P300-Spelling application revealed significantly lower accuracy and P300 amplitudes for the P300-Brain Painting application. This drop in accuracy and P300 amplitudes was not found when comparing the P300-Spelling application to an adapted, black and white matrix of the P300-Brain Painting application. By employing a black and white matrix, the accuracy of the P300-Brain Painting application was significantly enhanced and reached the accuracy of the P300-Spelling application. ALS-patients greatly enjoyed P300-Brain Painting and were able to use the application with the same accuracy as healthy subjects. P300-Brain Painting enables paralyzed patients to express themselves creatively and to participate in the prolific society through exhibitions.
Several studies have investigated the neural responses triggered by emotional pictures, but the specificity of the involved structures such as the amygdala or the ventral striatum is still under debate. Furthermore, only few studies examined the association of stimuli’s valence and arousal and the underlying brain responses. Therefore, we investigated brain responses with functional magnetic resonance imaging of 17 healthy participants to pleasant and unpleasant affective pictures and afterwards assessed ratings of valence and arousal. As expected, unpleasant pictures strongly activated the right and left amygdala, the right hippocampus, and the medial occipital lobe, whereas pleasant pictures elicited significant activations in left occipital regions, and in parts of the medial temporal lobe. The direct comparison of unpleasant and pleasant pictures, which were comparable in arousal clearly indicated stronger amygdala activation in response to the unpleasant pictures. Most important, correlational analyses revealed on the one hand that the arousal of unpleasant pictures was significantly associated with activations in the right amygdala and the left caudate body. On the other hand, valence of pleasant pictures was significantly correlated with activations in the right caudate head, extending to the nucleus accumbens (NAcc) and the left dorsolateral prefrontal cortex. These findings support the notion that the amygdala is primarily involved in processing of unpleasant stimuli, particularly to more arousing unpleasant stimuli. Reward-related structures like the caudate and NAcc primarily respond to pleasant stimuli, the stronger the more positive the valence of these stimuli is.