0 present participle of drift --
1 to move slowly, especially as a result of outside forces, with no control over direction: --
Overall, the majority of neurons sampled in this study (1390 193) exhibited some modification of their responses by activation of surrounding regions with drifting gratings.
Open circles represent spatial-frequency tuning for first-order gratings drifting in the preferred direction.
For drifting gratings of optimal spatial configuration, lower contrasts produced less surround suppression resulting in increases in preferred size.
It must also be noted that keeping the same grating's speed while changing the spatial frequency modifies the drifting temporal frequency.
But, some ganglion cells respond poorly, if at all to these stimuli, yet did respond to the gratings, particularly when they were drifting.
The numbers indicate the angles between the drifting components.
Therefore, in the second experiment, we measured temporal tuning functions of cor tical neurons using drifting plaid patterns (or thogonal contrast modulated sine-wave gratings).
Necessity of acetylcholine for retinal directionally selective responses to drifting gratings in rabbit.
