David studied mathematics at the TU Kaiserslautern until 2008. In his master thesis he analyzed the earth’s gravity signal derived from satellite measurements. He was interested in detecting local gravity field anomalies in areas with strong volcanic activity (e.g. Iceland, Hawaii) utilizing so called Wavelets. As a lateral entrant in the field of neuroscience, he focuses on obesity-related alterations in reward-based learning and cost-benefit decision-making processes. Specifically, in his latest PhD project he’s aiming at revealing if obese subjects show alterations in the trade-off between physical effort as a form of costs and different types of rewards (e.g. high-caloric snacks, money, etc.) during cost-benefit decisions. Beside basic behavioral measurements, he uses functional magnetic resonance imaging (fMRI) techniques to detect the neural correlates that underlie the behavioral observations.
Kube, J., Mathar, D., Horstmann, A., Kotz, S. A., Villringer, A., & Neumann, J. (2017).
Altered monetary loss processing and reinforcement-based learning in individuals with obesity. Brain
Imaging and Behavior. doi:10.1007/s11682-017‑9786-8.
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Mathar, D., Neumann, J., Villringer, A., & Horstmann, A. (2017). Failing to learn
from negative prediction errors: Obesity is associated with alterations in a fundamental neural learning mechanism.
Cortex, 95, 222–237. doi:10.1016/j.cortex.2017.08.022.
Mühlberg, C., Mathar, D., Villringer, A., Horstmann, A., & Neumann, J. (2016).
Stopping at the sight of food – How gender and obesity impact on response inhibition. Appetite,
107, 663–676. doi:10.1016/j.appet.2016.08.121.
Mathar, D., Wilkinson, L., Holl, A., Neumann, J., Deserno, L., Villringer, A., Jahanshahi, M., & Horstmann, A. (2016).
The role of dopamine in positive and negative prediction error utilization during incidental learning: Insights from Positron
Emission Tomography, Parkinson’s disease and Huntington’s disease. Cortex. doi:10.1016/j.cortex.2016.09.004.
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Dietrich, A., Hollmann, M., Mathar, D., Villringer, A., & Horstmann, A. (2016).
Brain regulation of food craving: Relationships with weight status and eating behavior. International
Journal of Obesity, 982–989. doi:10.1038/ijo.2016.28.
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Mathar, D., Horstmann, A., Pleger, B., Villringer, A., & Neumann, J. (2016). Is
it worth the effort? Novel insights into obesity-associated alterations in cost-benefit decision-making.
Frontiers in Behavioral Neuroscience, 9: 360. doi:10.3389/fnbeh.2015.00360.
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Horstmann, A., Dietrich, A., Mathar, D., Poessel, M., Villringer, A., & Neumann, J. (2015).
Slave to habit? Obesity is associated with decreased behavioural sensitivity to reward devaluation.
Appetite, 87, 175–183. doi:10.1016/j.appet.2014.12.212.
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Horstmann, A., Busse, F. P., Mathar, D., Mueller, K., Lepsien, J., Schlögl, H., Kabisch, S., Kratzsch, J., Neumann, J., Stumvoll,
M., Villringer, A., & Pleger, B. (2011). Obesity-related differences between women
and men in brain structure and goal-directed behavior. Frontiers in Human Neuroscience,
5: 58. doi:10.3389/fnhum.2011.00058.