TY - JOUR A1 - Postema, Merel C. A1 - Hoogman, Martine A1 - Ambrosino, Sara A1 - Asherson, Philip A1 - Banaschewski, Tobias A1 - Bandeira, Cibele E. A1 - Baranov, Alexandr A1 - Bau, Claiton H.D. A1 - Baumeister, Sarah A1 - Baur‐Streubel, Ramona A1 - Bellgrove, Mark A. A1 - Biederman, Joseph A1 - Bralten, Janita A1 - Brandeis, Daniel A1 - Brem, Silvia A1 - Buitelaar, Jan K. A1 - Busatto, Geraldo F. A1 - Castellanos, Francisco X. A1 - Cercignani, Mara A1 - Chaim‐Avancini, Tiffany M. A1 - Chantiluke, Kaylita C. A1 - Christakou, Anastasia A1 - Coghill, David A1 - Conzelmann, Annette A1 - Cubillo, Ana I. A1 - Cupertino, Renata B. A1 - de Zeeuw, Patrick A1 - Doyle, Alysa E. A1 - Durston, Sarah A1 - Earl, Eric A. A1 - Epstein, Jeffery N. A1 - Ethofer, Thomas A1 - Fair, Damien A. A1 - Fallgatter, Andreas J. A1 - Faraone, Stephen V. A1 - Frodl, Thomas A1 - Gabel, Matt C. A1 - Gogberashvili, Tinatin A1 - Grevet, Eugenio H. A1 - Haavik, Jan A1 - Harrison, Neil A. A1 - Hartman, Catharina A. A1 - Heslenfeld, Dirk J. A1 - Hoekstra, Pieter J. A1 - Hohmann, Sarah A1 - Høvik, Marie F. A1 - Jernigan, Terry L. A1 - Kardatzki, Bernd A1 - Karkashadze, Georgii A1 - Kelly, Clare A1 - Kohls, Gregor A1 - Konrad, Kerstin A1 - Kuntsi, Jonna A1 - Lazaro, Luisa A1 - Lera‐Miguel, Sara A1 - Lesch, Klaus‐Peter A1 - Louza, Mario R. A1 - Lundervold, Astri J. A1 - Malpas, Charles B A1 - Mattos, Paulo A1 - McCarthy, Hazel A1 - Namazova‐Baranova, Leyla A1 - Nicolau, Rosa A1 - Nigg, Joel T. A1 - Novotny, Stephanie E. A1 - Oberwelland Weiss, Eileen A1 - O'Gorman Tuura, Ruth L. A1 - Oosterlaan, Jaap A1 - Oranje, Bob A1 - Paloyelis, Yannis A1 - Pauli, Paul A1 - Picon, Felipe A. A1 - Plessen, Kerstin J. A1 - Ramos‐Quiroga, J. Antoni A1 - Reif, Andreas A1 - Reneman, Liesbeth A1 - Rosa, Pedro G.P. A1 - Rubia, Katya A1 - Schrantee, Anouk A1 - Schweren, Lizanne J.S. A1 - Seitz, Jochen A1 - Shaw, Philip A1 - Silk, Tim J. A1 - Skokauskas, Norbert A1 - Soliva Vila, Juan C. A1 - Stevens, Michael C. A1 - Sudre, Gustavo A1 - Tamm, Leanne A1 - Tovar‐Moll, Fernanda A1 - van Erp, Theo G.M. A1 - Vance, Alasdair A1 - Vilarroya, Oscar A1 - Vives‐Gilabert, Yolanda A1 - von Polier, Georg G. A1 - Walitza, Susanne A1 - Yoncheva, Yuliya N. A1 - Zanetti, Marcus V. A1 - Ziegler, Georg C. A1 - Glahn, David C. A1 - Jahanshad, Neda A1 - Medland, Sarah E. A1 - Thompson, Paul M. A1 - Fisher, Simon E. A1 - Franke, Barbara A1 - Francks, Clyde T1 - Analysis of structural brain asymmetries in attention‐deficit/hyperactivity disorder in 39 datasets JF - Journal of Child Psychology and Psychiatry N2 - Objective Some studies have suggested alterations of structural brain asymmetry in attention‐deficit/hyperactivity disorder (ADHD), but findings have been contradictory and based on small samples. Here, we performed the largest ever analysis of brain left‐right asymmetry in ADHD, using 39 datasets of the ENIGMA consortium. Methods We analyzed asymmetry of subcortical and cerebral cortical structures in up to 1,933 people with ADHD and 1,829 unaffected controls. Asymmetry Indexes (AIs) were calculated per participant for each bilaterally paired measure, and linear mixed effects modeling was applied separately in children, adolescents, adults, and the total sample, to test exhaustively for potential associations of ADHD with structural brain asymmetries. Results There was no evidence for altered caudate nucleus asymmetry in ADHD, in contrast to prior literature. In children, there was less rightward asymmetry of the total hemispheric surface area compared to controls (t = 2.1, p = .04). Lower rightward asymmetry of medial orbitofrontal cortex surface area in ADHD (t = 2.7, p = .01) was similar to a recent finding for autism spectrum disorder. There were also some differences in cortical thickness asymmetry across age groups. In adults with ADHD, globus pallidus asymmetry was altered compared to those without ADHD. However, all effects were small (Cohen’s d from −0.18 to 0.18) and would not survive study‐wide correction for multiple testing. Conclusion Prior studies of altered structural brain asymmetry in ADHD were likely underpowered to detect the small effects reported here. Altered structural asymmetry is unlikely to provide a useful biomarker for ADHD, but may provide neurobiological insights into the trait. KW - attention‐deficit KW - hyperactivity disorder KW - brain asymmetry KW - brain laterality KW - structural MRI KW - large‐scale data Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-239968 VL - 62 IS - 10 SP - 1202 EP - 1219 ER - TY - JOUR A1 - Herrmann, Martin J. A1 - Glotzbach, Evelyn A1 - Mühlberger, Andreas A1 - Gschwendtner, Kathrin A1 - Fallgatter, Andreas J. A1 - Pauli, Paul T1 - Prefrontal Brain Activation During Emotional Processing: A Functional Near Infrared Spectroscopy Study (fNIRS) JF - The Open Neuroimaging Journal N2 - The limbic system and especially the amygdala have been identified as key structures in emotion induction and regulation. Recently research has additionally focused on the influence of prefrontal areas on emotion processing in the limbic system and the amygdala. Results from fMRI studies indicate that the prefrontal cortex (PFC) is involved not only in emotion induction but also in emotion regulation. However, studies using fNIRS only report prefrontal brain activation during emotion induction. So far it lacks the attempt to compare emotion induction and emotion regulation with regard to prefrontal activation measured with fNIRS, to exclude the possibility that the reported prefrontal brain activation in fNIRS studies are mainly caused by automatic emotion regulation processes. Therefore this work tried to distinguish emotion induction from regulation via fNIRS of the prefrontal cortex. 20 healthy women viewed neutral pictures as a baseline condition, fearful pictures as induction condition and reappraised fearful pictures as regulation condition in randomized order. As predicted, the view-fearful condition led to higher arousal ratings than the view-neutral condition with the reappraise-fearful condition in between. For the fNIRS results the induction condition showed an activation of the bilateral PFC compared to the baseline condition (viewing neutral). The regulation condition showed an activation only of the left PFC compared to the baseline condition, although the direct comparison between induction and regulation condition revealed no significant difference in brain activation. Therefore our study underscores the results of previous fNIRS studies showing prefrontal brain activation during emotion induction and rejects the hypothesis that this prefrontal brain activation might only be a result of automatic emotion regulation processes. KW - fNIRS KW - Emotional processing KW - emotional regulation Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-97437 ER - TY - JOUR A1 - Glotzbach, Evelyn A1 - Mühlberger, Andreas A1 - Gschwendtner, Kathrin A1 - Fallgatter, Andreas J A1 - Pauli, Paul A1 - Herrmann, Martin J T1 - Prefrontal Brain Activation During Emotional Processing: A Functional Near Infrared Spectroscopy Study (fNIRS) JF - The Open Neuroimaging Journal N2 - The limbic system and especially the amygdala have been identified as key structures in emotion induction and regulation. Recently research has additionally focused on the influence of prefrontal areas on emotion processing in the limbic system and the amygdala. Results from fMRI studies indicate that the prefrontal cortex (PFC) is involved not only in emotion induction but also in emotion regulation. However, studies using fNIRS only report prefrontal brain activation during emotion induction. So far it lacks the attempt to compare emotion induction and emotion regulation with regard to prefrontal activation measured with fNIRS, to exclude the possibility that the reported prefrontal brain activation in fNIRS studies are mainly caused by automatic emotion regulation processes. Therefore this work tried to distinguish emotion induction from regulation via fNIRS of the prefrontal cortex. 20 healthy women viewed neutral pictures as a baseline condition, fearful pictures as induction condition and reappraised fearful pictures as regulation condition in randomized order. As predicted, the view-fearful condition led to higher arousal ratings than the view-neutral condition with the reappraise-fearful condition in between. For the fNIRS results the induction condition showed an activation of the bilateral PFC compared to the baseline condition (viewing neutral). The regulation condition showed an activation only of the left PFC compared to the baseline condition, although the direct comparison between induction and regulation condition revealed no significant difference in brain activation. Therefore our study underscores the results of previous fNIRS studies showing prefrontal brain activation during emotion induction and rejects the hypothesis that this prefrontal brain activation might only be a result of automatic emotion regulation processes. KW - fNIRS KW - Emotional processing KW - emotional regulation Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-141714 VL - 5 ER - TY - JOUR A1 - Hahn, Tim A1 - Karolien, Hilde A1 - Dresler, Thomas A1 - Kowarsch, Linda A1 - Reif, Andreas A1 - Fallgatter, Andreas J. T1 - Linking online gaming and addictive behavior: converging evidence for a general reward deficiency in frequent online garners JF - Frontiers in Behavioral Neuroscience N2 - Millions of people regularly play so-called massively multiplayer online role playing games (MMORPGs). Recently, it has been argued that MMORPG overuse is becoming a significant health problem worldwide. Symptoms such as tolerance, withdrawal, and craving have been described. Based on behavioral, resting state, and task-related neuroimaging data, we test whether frequent players of the MMORPG "World of VVarcraft" (WoW) similar to drug addicts and individuals with an increased risk for addictions show a generally deficient reward system. In frequent players of the MMORPG "World of VVarcraft" (WoW-players) and in a control group of non-gamers we assessed (1) trait sensitivity to reward (SR), (2) BOLD responses during monetary reward processing in the ventral striatum, and (3) ventral-striatal resting-state dynamics. We found a decreased neural activation in the ventral striatum during the anticipation of both small and large monetary rewards. Additionally, we show generally altered neurodynamics in this region independent of any specific task for WoW players (resting state). On the behavioral level, we found differences in trait SR, suggesting that the reward processing deficiencies found in this study are not a consequence of gaming, but predisposed to it. These findings empirically support a direct link between frequent online gaming and the broad field of behavioral and drug addiction research, thus opening new avenues for clinical interventions in addicted gamers and potentially improving the assessment of addiction-risk in the vast population of frequent gamers. KW - behavioral activation system KW - video-game KW - drug-addiction KW - sensitivity KW - dopamine KW - anticipation KW - massively multiplayer online role playing games KW - world of warcraft KW - resting-state fMRI KW - monetary incentive delay task KW - reward deficiency syndrome Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-114737 SN - 1662-5153 VL - 14 IS - 8 ER - TY - JOUR A1 - Ziegler, Georg C. A1 - Ehlis, Ann-Christine A1 - Weber, Heike A1 - Vitale, Maria Rosaria A1 - Zöller, Johanna E. M. A1 - Ku, Hsing-Ping A1 - Schiele, Miriam A. A1 - Kürbitz, Laura I. A1 - Romanos, Marcel A1 - Pauli, Paul A1 - Kalisch, Raffael A1 - Zwanzger, Peter A1 - Domschke, Katharina A1 - Fallgatter, Andreas J. A1 - Reif, Andreas A1 - Lesch, Klaus-Peter T1 - A Common CDH13 Variant is Associated with Low Agreeableness and Neural Responses to Working Memory Tasks in ADHD JF - Genes N2 - The cell—cell signaling gene CDH13 is associated with a wide spectrum of neuropsychiatric disorders, including attention-deficit/hyperactivity disorder (ADHD), autism, and major depression. CDH13 regulates axonal outgrowth and synapse formation, substantiating its relevance for neurodevelopmental processes. Several studies support the influence of CDH13 on personality traits, behavior, and executive functions. However, evidence for functional effects of common gene variation in the CDH13 gene in humans is sparse. Therefore, we tested for association of a functional intronic CDH13 SNP rs2199430 with ADHD in a sample of 998 adult patients and 884 healthy controls. The Big Five personality traits were assessed by the NEO-PI-R questionnaire. Assuming that altered neural correlates of working memory and cognitive response inhibition show genotype-dependent alterations, task performance and electroencephalographic event-related potentials were measured by n-back and continuous performance (Go/NoGo) tasks. The rs2199430 genotype was not associated with adult ADHD on the categorical diagnosis level. However, rs2199430 was significantly associated with agreeableness, with minor G allele homozygotes scoring lower than A allele carriers. Whereas task performance was not affected by genotype, a significant heterosis effect limited to the ADHD group was identified for the n-back task. Heterozygotes (AG) exhibited significantly higher N200 amplitudes during both the 1-back and 2-back condition in the central electrode position Cz. Consequently, the common genetic variation of CDH13 is associated with personality traits and impacts neural processing during working memory tasks. Thus, CDH13 might contribute to symptomatic core dysfunctions of social and cognitive impairment in ADHD. KW - ADHD KW - CDH13 KW - neurodevelopment KW - executive functions KW - working memory KW - Big Five KW - agreeableness Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-245220 SN - 2073-4425 VL - 12 IS - 9 ER - TY - JOUR A1 - Egetemeir, Johanna A1 - Stenneken, Prisca A1 - Koehler, Saskia A1 - Fallgatter, Andreas J. A1 - Herrmann, Martin J. T1 - Exploring the neural basis of real-life joint action: measuring brain activation during joint table setting with functional near-infrared spectroscopy JF - FRONTIERS IN HUMAN NEUROSCIENCE N2 - Many every-day life situations require two or more individuals to execute actions together. Assessing brain activation during naturalistic tasks to uncover relevant processes underlying such real-life joint action situations has remained a methodological challenge. In the present study, we introduce a novel joint action paradigm that enables the assessment of brain activation during real-life joint action tasks using functional near-infrared spectroscopy (fNIRS). We monitored brain activation of participants who coordinated complex actions with a partner sitting opposite them. Participants performed table setting tasks, either alone (solo action) or in cooperation with a partner (joint action), or they observed the partner performing the task (action observation). Comparing joint action and solo action revealed stronger activation (higher [oxy-Hb]-concentration) during joint action in a number of areas. Among these were areas in the inferior parietal lobule (IPL) that additionally showed an overlap of activation during action observation and solo action. Areas with such a close link between action observation and action execution have been associated with action simulation processes. The magnitude of activation in these IPL areas also varied according to joint action type and its respective demand on action simulation. The results validate fNIRS as an imaging technique for exploring the functional correlates of interindividual action coordination in real-life settings and suggest that coordinating actions in real-life situations requires simulating the actions of the partner. KW - joint action KW - fNIRS KW - neuroimaging KW - social interaction KW - real-life interaction KW - simulation Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-137054 N1 - Copyright © 2011 Egetemeir, Stenneken, Koehler, Fallgatter and Herrmann.This is an open-access article subject to a non-exclusive license between the authors and Frontiers Media SA,which permits use, distribution and reproduction in other forums, provided the original authors and source are credited andother Frontiers conditions are complied with. VL - 5 IS - 9, Artikel 95 ER - TY - JOUR A1 - Schecklmann, Martin A1 - Giani, Anette A1 - Tupak, Sara A1 - Langguth, Berthold A1 - Raab, Vincent A1 - Polak, Thomas A1 - Varallyay, Csanad A1 - Harnisch, Wilma A1 - Herrmann, Martin J. A1 - Fallgatter, Andreas J. T1 - Functional Near-Infrared Spectroscopy to Probe State- and Trait-Like Conditions in Chronic Tinnitus: A Proof-of-Principle Study JF - Neural Plasticity N2 - Objective. Several neuroscience tools showed the involvement of auditory cortex in chronic tinnitus. In this proof-of-principle study we probed the capability of functional near-infrared spectroscopy (fNIRS) for the measurement of brain oxygenation in auditory cortex in dependence from chronic tinnitus and from intervention with transcranial magnetic stimulation. Methods. Twenty-three patients received continuous theta burst stimulation over the left primary auditory cortex in a randomized sham-controlled neuronavigated trial (verum = 12; placebo = 11). Before and after treatment, sound-evoked brain oxygenation in temporal areas was measured with fNIRS. Brain oxygenation was measured once in healthy controls (n = 12). Results. Sound-evoked activity in right temporal areas was increased in the patients in contrast to healthy controls. Left-sided temporal activity under the stimulated area changed over the course of the trial; high baseline oxygenation was reduced and vice versa. Conclusions. By demonstrating that rTMS interacts with auditory evoked brain activity, our results confirm earlier electrophysiological findings and indicate the sensitivity of fNIRS for detecting rTMS induced changes in brain activity. Moreover, our findings of trait-and state-related oxygenation changes indicate the potential of fNIRS for the investigation of tinnitus pathophysiology and treatment response. KW - transcranial magnetic stimulation KW - positron-emission-tomography KW - auditory cortex KW - FNIRS KW - RTMS KW - neural activity KW - FMRI KW - brain KW - activation KW - humans Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-117801 SN - 1687-5443 IS - 894203 ER - TY - JOUR A1 - Rosenbaum, David A1 - Blum, Leonore A1 - Schweizer, Paul A1 - Fallgatter, Andreas J. A1 - Herrmann, Martin J. A1 - Ehlis, Ann-Christine A1 - Metzger, Florian G. T1 - Comparison of speed versus complexity effects on the hemodynamic response of the trail making test in block designs JF - Neurophotonics N2 - The use of functional near-infrared spectroscopy (fNIRS) in block designs provides measures of cortical activity in ecologically valid environments. However, in some cases, the use of block designs may be problematic when data are not corrected for performance in a time-restricted block. We sought to investigate the effects of task complexity and processing speed on hemodynamic responses in an fNIRS block design. To differentiate the effects of task complexity and processing speed, 20 subjects completed the trail making test (TMT) in two versions (TMT-A versus TMT-B) and three different speed levels (slow versus moderate versus fast). During TMT-A, subjects are asked to connect encircled numbers in numerically ascending order (1-2-3 ... ). In the more complex TMT-B, subjects are instructed to connect encircled numbers and letters in alternating ascending order (1-A-2-B ... ). To illustrate the obscuring effects of processing speed on task complexity, we perform two different analyses. First, we analyze the classical measures of oxygenated blood, and second, we analyze the measures corrected for the number of processed items. Our results show large effects for processing speed within the bilateral inferior frontal gyrus, left dorsolateral prefrontal cortex, and superior parietal lobule (SPL). The TMT contrast did not show significant effects with classical measures, although trends are observed for higher activation during TMT-B. When corrected for processed items, higher activity for TMT-B in comparison to TMT-A is found within the SPL. The results are discussed in light of recent research designs, and simple to use correction methods are suggested. (c) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. KW - functional near-infrared spectroscopy KW - trail making test KW - processing speed KW - task complexity Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-226982 VL - 5 IS - 4 ER - TY - JOUR A1 - Haeussinger, Florian B. A1 - Heinzel, Sebastian A1 - Hahn, Tim A1 - Schecklmann, Martin A1 - Ehlis, Ann-Christine A1 - Fallgatter, Andreas J. T1 - Simulation of Near-Infrared Light Absorption Considering Individual Head and Prefrontal Cortex Anatomy: Implications for Optical Neuroimaging JF - PLoS ONE N2 - Functional near-infrared spectroscopy (fNIRS) is an established optical neuroimaging method for measuring functional hemodynamic responses to infer neural activation. However, the impact of individual anatomy on the sensitivity of fNIRS measuring hemodynamics within cortical gray matter is still unknown. By means of Monte Carlo simulations and structural MRI of 23 healthy subjects (mean age: (25.0 +/- 2.8) years), we characterized the individual distribution of tissue-specific NIR-light absorption underneath 24 prefrontal fNIRS channels. We, thereby, investigated the impact of scalp-cortex distance (SCD), frontal sinus volume as well as sulcal morphology on gray matter volumes (V(gray)) traversed by NIR-light, i.e. anatomy-dependent fNIRS sensitivity. The NIR-light absorption between optodes was distributed describing a rotational ellipsoid with a mean penetration depth of (23.6 +/- 0.7) mm considering the deepest 5% of light. Of the detected photon packages scalp and bone absorbed (96.4 +/- 9: 7)% and V(gray) absorbed (3.1 +/- 1.8)% of the energy. The mean V(gray) volume (1.1 +/- 0.4)cm(3) was negatively correlated (r = - .76) with the SCD and frontal sinus volume (r = - .57) and was reduced by 41.5% in subjects with relatively large compared to small frontal sinus. Head circumference was significantly positively correlated with the mean SCD (r = .46) and the traversed frontal sinus volume (r = .43). Sulcal morphology had no significant impact on V(gray). Our findings suggest to consider individual SCD and frontal sinus volume as anatomical factors impacting fNIRS sensitivity. Head circumference may represent a practical measure to partly control for these sources of error variance. KW - Beer-lambert law KW - Adult head KW - Human brain KW - Spectroscopy fnirs KW - Photon migration KW - Propagation KW - Scattering KW - Model KW - Tissues KW - Media Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-142311 VL - 6 IS - 10 ER - TY - JOUR A1 - Üçeyler, Nurcan A1 - Kewenig, Susanne A1 - Kittel-Schneider, Sarah A1 - Fallgatter, Andreas J. A1 - Sommer, Claudia T1 - Increased cortical activation upon painful stimulation in fibromyalgia syndrome JF - BMC Neurology N2 - Background Fibromyalgia syndrome (FMS) is a chronic condition characterized by widespread pain and associated symptoms. We investigated cerebral activation in FMS patients by functional near-infrared spectroscopy (fNIRS). Methods Two stimulation paradigms were applied: a) painful pressure stimulation at the dorsal forearm; b) verbal fluency test (VFT). We prospectively recruited 25 FMS patients, ten patients with unipolar major depression (MD) without pain, and 35 healthy controls. All patients underwent neurological examination and all subjects were investigated with questionnaires (pain, depression, FMS, empathy). Results FMS patients had lower pressure pain thresholds than patients with MD and controls (p < 0.001) and reported higher pain intensity (p < 0.001). Upon unilateral pressure pain stimulation fNIRS recordings revealed increased bilateral cortical activation in FMS patients compared to controls (p < 0.05). FMS patients also displayed a stronger contralateral activity over the dorsolateral prefrontal cortex in direct comparison to patients with MD (p < 0.05). While all three groups performed equally well in the VFT, a frontal deficit in cortical activation was only found in patients with depression (p < 0.05). Performance and cortical activation correlated negatively in FMS patients (p < 0.05) and positively in patients with MD (p < 0.05). Conclusion Our data give further evidence for altered central nervous processing in patients with FMS and the distinction between FMS and MD. KW - fibromyalgia syndrome KW - depression KW - cortical activation KW - pain KW - near-infrared spectroscopy Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-125230 VL - 15 IS - 210 ER - TY - JOUR A1 - Bender, Stephan A1 - Resch, Franz A1 - Klein, Christoph A1 - Renner, Tobias A1 - Fallgatter, Andreas J. A1 - Weisbrod, Matthias A1 - Romanos, Marcel T1 - Influence of Stimulant Medication and Response Speed on Lateralization of Movement-Related Potentials in Attention-Deficit/Hyperactivity Disorder JF - PLoS One N2 - Background: Hyperactivity is one of the core symptoms in attention deficit hyperactivity disorder (ADHD). However, it remains unclear in which way the motor system itself and its development are affected by the disorder. Movement-related potentials (MRP) can separate different stages of movement execution, from the programming of a movement to motor post-processing and memory traces. Pre-movement MRP are absent or positive during early childhood and display a developmental increase of negativity. Methods: We examined the influences of response-speed, an indicator of the level of attention, and stimulant medication on lateralized MRP in 16 children with combined type ADHD compared to 20 matched healthy controls. Results: We detected a significantly diminished lateralisation of MRP over the pre-motor and primary motor cortex during movement execution (initial motor potential peak, iMP) in patients with ADHD. Fast reactions (indicating increased visuo-motor attention) led to increased lateralized negativity during movement execution only in healthy controls, while in children with ADHD faster reaction times were associated with more positive amplitudes. Even though stimulant medication had some effect on attenuating group differences in lateralized MRP, this effect was insufficient to normalize lateralized iMP amplitudes. Conclusions: A reduced focal (lateralized) motor cortex activation during the command to muscle contraction points towards an immature motor system and a maturation delay of the (pre-) motor cortex in children with ADHD. A delayed maturation of the neuronal circuitry, which involves primary motor cortex, may contribute to ADHD pathophysiology. KW - deficit-hyperactivity disorder KW - anticipatory mechanisms KW - motor preparation KW - TIC disorder KW - children KW - ADHD KW - methylphenidate KW - contingent negative-variation KW - continuous performance-test KW - slow cortical potentials Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-135262 VL - 7 IS - 6 ER - TY - JOUR A1 - Hahn, Tim A1 - Dresler, Thomas A1 - Pyka, Martin A1 - Notebaert, Karolien A1 - Fallgatter, Andreas J. T1 - Local Synchronization of Resting-State Dynamics Encodes Gray's Trait Anxiety JF - PLoS ONE N2 - The Behavioral Inhibition System (BIS) as defined within the Reinforcement Sensitivity Theory (RST) modulates reactions to stimuli indicating aversive events. Gray's trait Anxiety determines the extent to which stimuli activate the BIS. While studies have identified the amygdala-septo-hippocampal circuit as the key-neural substrate of this system in recent years and measures of resting-state dynamics such as randomness and local synchronization of spontaneous BOLD fluctuations have recently been linked to personality traits, the relation between resting-state dynamics and the BIS remains unexplored. In the present study, we thus examined the local synchronization of spontaneous fMRI BOLD fluctuations as measured by Regional Homogeneity (ReHo) in the hippocampus and the amygdala in twenty-seven healthy subjects. Correlation analyses showed that Gray's trait Anxiety was significantly associated with mean ReHo in both the amygdala and the hippocampus. Specifically, Gray's trait Anxiety explained 23% and 17% of resting-state ReHo variance in the left amygdala and the left hippocampus, respectively. In summary, we found individual differences in Gray's trait Anxiety to be associated with ReHo in areas previously associated with BIS functioning. Specifically, higher ReHo in resting-state neural dynamics corresponded to lower sensitivity to punishment scores both in the amygdala and the hippocampus. These findings corroborate and extend recent findings relating resting-state dynamics and personality while providing first evidence linking properties of resting-state fluctuations to Gray's BIS. KW - reward KW - bold activity KW - amygdala KW - brain KW - personality KW - sensitivity KW - punishment KW - dimensions KW - modulation KW - predict Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-131057 VL - 8 IS - 3 ER -