Supplementary eye fields (SEF) and memory-based smooth pursuit eye movements: Working memory and decision processes

We investigated the spatial distribution of simple-spike response types of Purkinje cells (P-cells) within the cerebellar nodulus and uvula during sinusoidal head rotation in vertical plane in awake cats. Cells demonstrating the strongest response to the roll plane tended to be located in a parasagittal band extending more than 1.0 mm lateral to the midline, while those with the strongest response to pitch plane tended to be located in a band extending up to 1.0 mm from the midline. These findings suggest that there are at least 2 sagittal functional zones with a rostrocaudal extent in the search area examined in the present study. Such spatial information might be transmitted to the brainstem nuclei to control motor dynamics for the optokinetic responses under head-tilt conditions in each specific plane.