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Volume 16, Number 10,
Issue of May 15, 1996
pp. 3444-3458
Copyright ©1996 Society for Neuroscience
Implementation of Action Sequences by a Neostriatal Site: A
Lesion Mapping Study of Grooming Syntax
Received Oct. 26, 1995; revised Jan. 16, 1996; accepted Feb. 9, 1996.
Howard C. Cromwell and
Kent C. Berridge
Department of Psychology, The University of Michigan, Ann Arbor,
Michigan 48109-1109
The neostriatum and its connections control the sequential
organization of action (``action syntax'') as well as simpler aspects
of movement. This study focused on sequential organization of rodent
grooming. Grooming syntax provides an opportunity to study how neural
systems coordinate natural patterns of serial order. The most
stereotyped of these grooming patterns, a ``syntactic chain,'' has a
particularly stereotyped order that recurs thousands of times more
often than could occur by chance. The purpose of the present study was
to identify the crucial site within the striatopallidal system where
lesions disrupt the syntax or serial order of syntactic grooming chains
without disrupting constituent movements. Small excitotoxin lesions
were made using quinolinic acid at bilateral sites within the
dorsolateral, dorsomedial, ventrolateral, or ventromedial neostriatum,
or in the ventral pallidum or globus pallidus of rats. An objective
technique for mapping functional lesions was used to quantify cell
death and to map precisely those lesions that disrupted grooming
syntax. Our results identified a single site within the anterior
dorsolateral neostriatum, slightly more than a cubic millimeter in size
(1.3 × 1.0 × 1.0 mm), as crucial to grooming syntax. Damage to this
site did not disrupt the ability to emit grooming actions. By contrast,
damage to sites in the ventral pallidum and globus pallidus impaired
grooming actions but left the sequential organization of grooming
syntax intact. Neural circuits within this crucial ``action syntax
site'' seem to implement sequential patterns of behavior as a specific
function.
Key words:
neostriatum;
globus pallidus;
basal ganglia;
pallidum;
movement;
sensorimotor;
sequence;
serial order;
syntax;
lesion;
quinolinic acid;
excitotoxin;
stereology;
grooming;
neuroethology
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