*I will not be accepting graduate student applications for the 2018-19 academic year*
Dr. Orr’s research examines the psychological and neural mechanisms underlying executive functions. Specifically, he is interested in the factors that underlie voluntary task selection; while we may think we have control over which task we choose at any given moment, there are a number of factors that influence our choices. Dr. Orr work suggests that overcoming task choice biases from external stimuli depends on the frontal pole of the brain, which is thought to be involved in coordinating the activity of multiple other brain areas. More recently, this work has focused on how stimuli associated with reward bias our task choices. Dr. Orr’s work involves behavioral approaches, non-invasive brain stimulation, and neuroimaging (structural and functional MRI, EEG/ERP, and DWI) in both healthy and clinical populations. Dr. Orr’s work was recently funded by the National Institute on Drug Abuse.
NIDA 1F32DA034412 Kirschstein National Research Service Award, “Organization and timecourse of the neural mechanisms for cognitive flexibility.” April 2013 – April 2016.
Orr, J.M., Paschall, C.J., & Banich, M.T. (2016). Recreational marijuana use impacts white matter integrity and subcortical (but not cortical) morphometry. NeuroImage: Clinical, 12, 45-56.
Orr, J.M., Smolker, H.R., & Banich, M.T. (2015). Organization of the human frontal pole revealed by large-scale DTI-based connectivity: Implications for control of behavior. PLoS one.
Bernard, J.A., Orr, J.M., & Mittal, V.A. (2015). Abnormal hippocampal-thalamic white matter tract development and positive symptom course in adolescents at ultra high-risk for psychosis. npj Schizophrenia.
Orr, J.M., Turner, J., & Mittal, V.A. (2014). Altered resting-state functional connectivity associated with psychotic experiences in the general population. NeuroImage: Clinical, 4, 343–351.
Orr, J.M. & Banich, M.T. (2014). Neural mechanisms underlying internally and externally guided task selection. NeuroImage, 84, 191-205.