Monkey saccadic latency and pursuit velocity show a preference for upward directions of target motion.

Saccadic latency was studied as a function of the direction of sudden target displacements (steps) and of subsequent smooth target motion (ramps) in Macaca fascicularis. The monkey fixated a central spot that suddenly changed its position and then moved constantly at 10 deg s-1, thus eliciting initial saccades and subsequent pursuit eye movements (recorded by a magnetic search-coil technique). Latencies for initial saccades differed markedly in the vertical axis, being shorter in upward than downward directions for both step and ramp components of target motion.

Motion-onset visual-evoked potentials as a function of retinal eccentricity in man.

Visual-evoked potentials were elicited by the motion-onset of a black-and-white square-wave grating of 2.4 cycles/deg that drifted from right to left at a velocity of 3 deg/s. The center of the 2 x 2 deg stimulus field was binocularly viewed either foveally or at eccentricities of 6, 12, or 20 deg in the lower visual field along the vertical meridian.

The human motion VEP as a function of size and eccentricity of the stimulation field.

A 'motion onset VEP' was elicited by the onset of a pattern drift. The amplitude of the most distinct wave (AN200) was determined on the following stimulation conditions: eccentricity, 0 to 23 deg; velocity. 1.

[Topography of the movement visual evoked potential in the human].

The amplitudes of the motion VEP waves P100, N200 and P300 were investigated on 12 subjects at six electrode positions (2.5, 5, 7.5 and 10 cm above the inion and 5 cm bilaterally from the 2.

[Visual evoked potentials in pattern motion].

Our intention was to obtain a visual evoked potential (VEP) consisting only of a movement-related component for the purpose of further investigations of movement detection. This was attempted by selection of appropriate stimulus conditions. Evoked by initial movement a VEP with five typical waves was observed at the human occipital scalp.