Spatial- and temporal-frequency selectivity as a basis for velocity preference in cat striate cortex neurons. 
Measurements were made of the optimal velocity for drifting bar-shaped stimuli to excite striate cortex neurons of the cat.  These data were compared to the optimal spatial and temporal frequencies of the same neurons, as determined with drifting sine-wave grating stimuli.  A systematic relationship was revealed, whereby those neurons preferring higher velocities of bar motion also preferred lower spatial and higher temporal frequencies of gratings.  The optimal bar velocity for a given neuron could be quantitatively predicted from the ratio of that neuron's optimal temporal frequency to its optimal spatial frequency.