Diffusion Tensor Imaging and Decision Making in Cocaine Dependence

• Published in: PloS one Vol. 5; no. 7; p. e11591
• Main Authors: Lane, Scott D., Steinberg, Joel L., Ma, Liangsuo, Hasan, Khader M., Kramer, Larry A., Zuniga, Edward A., Narayana, Ponnada A., Moeller, Frederick Gerard
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 16.07.2010; Public Library of Science (PLoS)
• Subjects: Abnormalities; Adult; Alcohol; Alcohol use; Anisotropy; Attention deficit hyperactivity disorder; Behavioral sciences; Brain; Cocaine; Cocaine-Related Disorders - physiopathology; Corpus callosum; Decision making; Decision Making - physiology; Diffusion; Diffusion Tensor Imaging - methods; Drug abuse; Eigenvalues; Female; Gambling; Humans; Impairment; Integrity; Magnetic resonance imaging; Male; Mental Health/Psychology; Mental Health/Psychopharmacology; Mental Health/Substance Abuse; Narcotics; Neuroimaging; Neuroscience/Neurobiology of Disease and Regeneration; Neuroscience/Psychology; Neurosciences; Psychiatry; Studies; Substantia alba; Tobacco; Trauma centers; United States > US; Texas
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0011591

Chronic stimulant abuse is associated with both impairment in decision making and structural abnormalities in brain gray and white matter. Recent data suggest these structural abnormalities may be related to functional impairment in important behavioral processes. In 15 cocaine-dependent and 18 control subjects, we examined relationships between decision-making performance on the Iowa Gambling Task (IGT) and white matter integrity as measured by diffusion tensor imaging (DTI). Whole brain voxelwise analyses showed that, relative to controls, the cocaine group had lower fractional anisotropy (FA) and higher mean of the second and third eigenvalues (lambda perpendicular) in frontal and parietal white matter regions and the corpus callosum. Cocaine subjects showed worse performance on the IGT, notably over the last 40 trials. Importantly, FA and lambda perpendicular values in these regions showed a significant relationship with IGT performance on the last 40 trials. Compromised white matter integrity in cocaine dependence may be related to functional impairments in decision making.