PMID: 2493792Feb 1, 1989Paper

Behavioral lateralization in rats and dopaminergic system: individual and population laterality

Behavioral Neuroscience
M A CastellanoM Rodriguez

Abstract

Recently, we reported that practice facilitates the expression of the behavioral asymmetry in rats at individual and population levels. In the present study we investigated the side preference in the performance of four different tasks during 10 successive days. The practice increased individual laterality and internal consistency in all tasks. In addition, practice facilitated the expression of marked population laterality in two tasks (78.1% and 63.3% for right bias). The influence of dopaminergic systems on these behaviors was evaluated with apomorphine and with 6-hydroxydopamine lesions ipsi- and contralateral to the side preference. The results suggest that there is a presynaptic dominance contralateral to the side preference in the four tests. However, as influences of dopaminergic systems were different in each task and because the tests were unrelated, the results suggest that the behavioral laterality in rats, as in humans, is a phenomenon caused by different and relatively independent systems.

Citations

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