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The Journal of Neuroscience, January 1, 2002, 22(1):305-314

Differential Metabolic Activity in the Striosome and Matrix Compartments of the Rat Striatum during Natural Behaviors

Lucy L. Brown¹, Samuel M. Feldman², Diane M. Smith¹, James R. Cavanaugh², Robert F. Ackermann³, and Ann M. Graybiel⁴

¹ Departments of Neurology and Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461, ² Center for Neural Science, New York University, New York, New York 10003, ³ Department of Psychiatry and Behavioral Neurobiology, University of Alabama School of Medicine, Birmingham, Alabama 35294, and ⁴ Department of Brain and Cognitive Sciences and the McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

The striosome and matrix compartments of the striatum are clearly identified by their neurochemical expression patterns and anatomical connections. To determine whether these compartments are distinguishable functionally, we used [¹⁴C]deoxyglucose metabolic mapping in the rat and tested whether neutral behavioral states (free movement, gentle restraint, and focal tactile stimulation under gentle restraint) were associated with regions of high metabolic activity in the matrix, in striosomes, or in both. We identified metabolic peaks in the striatum by means of image analysis, striosome-matrix boundaries by [³H]naloxone binding, and primary somatosensory corticostriatal input clusters by injections of anterograde tracer into electrophysiologically identified sites in SI. Peak metabolic activity was primarily confined to the matrix compartment under each behavioral condition. These findings show that during relatively neutral behavioral conditions the balance of activity between the two compartments favors the matrix and suggest that this balance is present in the striatum as part of normal behavior and processing of afferent activity.

Key words: basal ganglia; caudate-putamen; deoxyglucose; metabolic mapping; somatosensory cortex; striosome; matrix

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Copyright © 2002 Society for Neuroscience  0270-6474/02/221305-10$05.00/0

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