Quinpirole-induced sensitization to noisy/sparse periodic input: temporal synchronization as a component of obsessive-compulsive disorder

Abstract Quinpirole-sensitized rats were tested on a discrete-trials 40-s peak-interval procedure using lever pressing as the instrumental response. Although there was no evidence of rhythmical activity in lever pressing, periodic output was observed in a secondary response (food-cup entries) during...

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Bibliographic Details
Published in:Neuroscience 2011-04, Vol.179, p.143-150
Main Authors: Gu, B.M, Cheng, R.K, Yin, B, Meck, W.H
Format: Article
Language:English
Subjects:
Animals
Behavior, Animal - drug effects
Behavior, Animal - physiology
Biological and medical sciences
Brain - drug effects
Brain - physiopathology
Cortical Synchronization - physiology
cyclic behavior
Dopamine Agonists - pharmacology
duration discrimination
Fundamental and applied biological sciences. Psychology
interval timing
Male
Neurology
Obsessive-Compulsive Disorder - physiopathology
Quinpirole - pharmacology
Rats
Rats, Sprague-Dawley
rhythm production
timing and time perception
Vertebrates: nervous system and sense organs
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Summary:Abstract Quinpirole-sensitized rats were tested on a discrete-trials 40-s peak-interval procedure using lever pressing as the instrumental response. Although there was no evidence of rhythmical activity in lever pressing, periodic output was observed in a secondary response (food-cup entries) during the inter-trial interval following the delivery of reinforcement on fixed-interval trials, but not during unreinforced probe trials. This repetitive pattern of behavior with a 40-s period points to the primacy of reinforcement as a time marker and an increased tendency to synchronize to noisy and sparse periodic input as a result of reduced inhibitory control in cortico-striatal circuits following chronic quinpirole administration. Parallels between quinpirole-induced rhythmical behavior and the repetitive motor habits frequently observed in obsessive-compulsive disorder are discussed.
ISSN:0306-4522
1873-7544
DOI:10.1016/j.neuroscience.2011.01.048