Journal
BEHAVIOURAL BRAIN RESEARCH
Volume 175, Issue 1, Pages 62-74Publisher
ELSEVIER
DOI: 10.1016/j.bbr.2006.08.004
Keywords
dopamine; raclopride; cortico-striatal circuits; preparatory interval; reaction time; timing and time perception
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In a series of three experiments, simple reaction time (RT) was characterized with respect to a variable preparatory interval (PI) in order to investigate the relationship between interval timing and RT. In Experiment 1, it was shown that RT decreases as a function of PI and that this effect varies with amount of training. In Experiment 2, RT was shown to increase during probe trials that used a novel 6.25 s PI, suggesting that the specific durations of the PIs encoded during initial training contribute to the PI effect on RT. In Experiment 3, 100 mu g/kg i.p. of raclopride proportionally slowed RT as a function of the PI. These results are discussed within the context of neuropsychological models of interval timing and support an underlying role for cortico-striatal dopaminergic function in temporal processing and simple RT measurements. (c) 2006 Elsevier B.V. All rights reserved.
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