Asymmetry of the amplitude-time properties of directed saccades in monkeys depending on the complexity of the spatial scheme of visual stimulation.

Three Macaca rhesus monkeys were used for studies of the performance of visually evoked saccades in single-step changes in the position of a stimulus using standard schemes for presentation of GAP-OVERLAP stimuli. Two spatial schemes were used: presentation of stimuli along the horizontal meridian (one-dimensional) and presentation of stimuli within a rectangular area of the visual field (two-dimensional). Asymmetrical foci of short-and long-latency saccades were found in the visual field. Dispersion factor analysis demonstrated that the dimensionality factor (one-dimensional versus two-dimensional stimulation schemes) had greater effects on the latent period of saccades than the lateralization factor (presentation on the left or right sides of the gaze point). The precision of the performance of visually evoked saccades decreased with increases in its eccentricity in both spatial stimulation schemes.