Effects of lesions to the cerebellar vermis and hemispheres on timing and counting in rats.

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Abstract
The effects of lesions to the cerebellum on numerical and temporal discrimination were examined in rats using a psychophysical choice procedure. Lesions to the cerebellar hemispheres but not the cerebellar vermis produced performance deficits in a numerical discrimination task (2-8 events) and a milliseconds temporal discrimination task (0.2-0.8 s). However, temporal discriminations in the seconds range (2-8 s) were unaffected by either type of lesion. Using W. H. Meck and R. M. Church's (1983) mode-control model of timing and counting, these findings suggest that damage to the cerebellar hemispheres influences a source of constant variability (e.g., switch processes) because constant variability is a prominent source of error during both milliseconds timing and counting but is masked by other sources of variability when timing longer durations (>2 s).

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