The goals of my proposed research are to use functional magnetic resonance imaging to (1) clarify the role of the orbitofrontal cortex (OFC) in using reinforcements to guide reward-seeking behavior, and (2) test the hypothesis that individual differences in impulsivity are reflected in OFC activity during reward-seeking behavior. Evidence suggests that OFC is critically involved in reward-based motivation and reinforcement, but the precise function of this region remains debated. I will test the hypothesis that OFC mediates the relationship between reinforcements of current behavior and adjustments in future reward-seeking risk-taking behavior. Two existing theoretical frameworks make differing predictions about how OFC activity would relate to adjustments in behavior, and my experiment is designed to test these predictions. Further, researchers have hypothesized that highly impulsive individuals, who are at risk for developing addictive disorders, fail to use contextual information to guide their behavior. I will test the hypothesis that this is reflected both in the ability to use reinforcements to guide future behavior, and in the extent to which OFC is recurited during these behavioral adjustments.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Predoctoral Individual National Research Service Award (F31)
Project #
5F31DA018505-02
Application #
7148080
Study Section
Human Development Research Subcommittee (NIDA)
Program Officer
Grant, Steven J
Project Start
2005-09-22
Project End
2007-09-21
Budget Start
2006-09-22
Budget End
2007-09-21
Support Year
2
Fiscal Year
2006
Total Cost
$29,856
Indirect Cost
Name
University of California Davis
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
047120084
City
Davis
State
CA
Country
United States
Zip Code
95618
Cohen, Michael X; Axmacher, Nikolai; Lenartz, Doris et al. (2009) Nuclei accumbens phase synchrony predicts decision-making reversals following negative feedback. J Neurosci 29:7591-8
Cohen, Michael X; Elger, Christian E; Ranganath, Charan (2007) Reward expectation modulates feedback-related negativity and EEG spectra. Neuroimage 35:968-78
Cohen, Michael X (2007) Individual differences and the neural representations of reward expectation and reward prediction error. Soc Cogn Affect Neurosci 2:20-30