@article{WinterKernGalletal.2021,
  author    = {Winter, Carla and Kern, Florian and Gall, Dominik and Latoschik, Marc Erich and Pauli, Paul and K{\"a}thner, Ivo},
  title     = {Immersive virtual reality during gait rehabilitation increases walking speed and motivation: a usability evaluation with healthy participants and individuals with multiple sclerosis and stroke},
  series = {Journal of Neuroengineering and Rehabilitation},
  volume    = {18},
  journal   = {Journal of Neuroengineering and Rehabilitation},
  number    = {1},
  issn      = {1743-0003},
  doi       = {10.1186/s12984-021-00848-w},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-258698},
  year      = {2021},
  abstract  = {Background: The rehabilitation of gait disorders in patients with multiple sclerosis (MS) and stroke is often based on conventional treadmill training. Virtual reality (VR)-based treadmill training can increase motivation and improve therapy outcomes. The present study evaluated an immersive virtual reality application (using a head-mounted display, HMD) for gait rehabilitation with patients to (1) demonstrate its feasibility and acceptance and to (2) compare its short-term effects to a semi-immersive presentation (using a monitor) and a conventional treadmill training without VR to assess the usability of both systems and estimate the effects on walking speed and motivation. Methods: In a within-subjects study design, 36 healthy participants and 14 persons with MS or stroke participated in each of the three experimental conditions (VR via HMD, VR via monitor, treadmill training without VR). Results: For both groups, the walking speed in the HMD condition was higher than in treadmill training without VR and in the monitor condition. Healthy participants reported a higher motivation after the HMD condition as compared with the other conditions. Importantly, no side effects in the sense of simulator sickness occurred and usability ratings were high. No increases in heart rate were observed following the VR conditions. Presence ratings were higher for the HMD condition compared with the monitor condition for both user groups. Most of the healthy study participants (89\%) and patients (71\%) preferred the HMD-based training among the three conditions and most patients could imagine using it more frequently. Conclusions For the first time, the present study evaluated the usability of an immersive VR system for gait rehabilitation in a direct comparison with a semi-immersive system and a conventional training without VR with healthy participants and patients. The study demonstrated the feasibility of combining a treadmill training with immersive VR. Due to its high usability and low side effects, it might be particularly suited for patients to improve training motivation and training outcome e. g. the walking speed compared with treadmill training using no or only semi-immersive VR. Immersive VR systems still require specific technical setup procedures. This should be taken into account for specific clinical use-cases during a cost-benefit assessment.},
  language  = {en}
}
@article{KrishnaRiedMeixner2021,
  author    = {Krishna, Anand and Ried, Sophia and Meixner, Marie},
  title     = {State-trait interactions in regulatory focus determine impulse buying behavior},
  series = {PLoS One},
  volume    = {16},
  journal   = {PLoS One},
  number    = {7},
  doi       = {10.1371/journal.pone.0253634},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-261206},
  year      = {2021},
  abstract  = {Little research has focused on motivational state-trait interactions to explain impulse buying. Although the trait chronic regulatory focus has been linked to impulse buying, no evidence yet exists for an effect of situational regulatory focus and no research has examined whether the fit of chronic and situational regulatory focus can influence impulse buying with actual consumptive consequences rather than purchase intentions. Two laboratory experiments (total N = 250) manipulated situational regulatory focus before providing opportunities for impulse buying. In addition, cognitive constraint was manipulated as a potential boundary condition for regulatory focus effects. Situational promotion focus increased impulse buying relative to situational prevention focus in participants with strong chronic promotion, consistent with regulatory fit theory and independently of cognitive constraint. Surprisingly, situational promotion focus also increased impulse buying in participants with strong chronic prevention, but only under low cognitive constraint. These results may be explained by diverging mediating cognitive processes for promotion vs. prevention focus' effect on impulse buying. Future research must focus more on combining relevant states and traits in predicting consumer behavior. Marketing implications are discussed.},
  language  = {en}
}
@article{KleihDahmsBotrelKuebler2021,
  author    = {Kleih-Dahms, Sonja Christina and Botrel, Loic and K{\"u}bler, Andrea},
  title     = {The influence of motivation and emotion on sensorimotor rhythm-based brain-computer interface performance},
  series = {Psychophysiology},
  volume    = {58},
  journal   = {Psychophysiology},
  number    = {8},
  doi       = {10.1111/psyp.13832},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-259664},
  year      = {2021},
  abstract  = {While decades of research have investigated and technically improved brain-computer interface (BCI)-controlled applications, relatively little is known about the psychological aspects of brain-computer interfacing. In 35 healthy students, we investigated whether extrinsic motivation manipulated via monetary reward and emotional state manipulated via video and music would influence behavioral and psychophysiological measures of performance with a sensorimotor rhythm (SMR)-based BCI. We found increased task-related brain activity in extrinsically motivated (rewarded) as compared with nonmotivated participants but no clear effect of emotional state manipulation. Our experiment investigated the short-term effect of motivation and emotion manipulation in a group of young healthy subjects, and thus, the significance for patients in the locked-in state, who may be in need of a BCI, remains to be investigated.},
  language  = {en}
}