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Behavioral and Cognitive Neuroscience Reviews, Vol. 2, No. 3, 198-221 (2003)
DOI: 10.1177/1534582303259057
© 2003 SAGE Publications

Brain Systems Underlying Susceptibility to Helplessness and Depression

J. Shumake

University of Texas at Austin

F. Gonzalez-Lima

University of Texas at Austin, gonzalez-lima{at}psy.utexas.edu

There has been a relative lack of research into the neurobiological predispositions that confer vulnerability to depression. This article reviews functional brain mappings from a genetic animal model, the congenitally helpless rat, which is predisposed to develop learned helplessness. Neurometabolic findings from this model are integrated with the neuroscientific literature from other animal models of depression as well as depressed humans. Changes in four major brain systems are suggested to underlie susceptibility to helplessness and possibly depression: (a) an unbalanced prefrontal-cingulate cortical system, (b) a dissociated hypothalamic-pituitary-adrenal axis, (c) a dissociated septal-hippocampal system, and (d) a hypoactive brain reward system, as exemplified by a hypermetabolic habenula-interpeduncular nucleus pathway and a hypometabolic ventral tegmental area-striatum pathway. Functional interconnections and causal relationships among these systems are considered and further experiments are suggested, with theoretical attention to how an abnormality in any one system could affect the others.

Key Words: depression • helplessness • brain mapping • animal model • genetic predisposition


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