Contrast affects speed tuning, space-time slant, and receptive-field organization of simple cells in macaque V1.

Contrast affects speed tuning , space - time slant , and receptive - field organization of simple cells in macaque

stimuli. We found that the space-time slant of the receptive field of directional simple cells differed for high and low contrast stimuli, with the space-time slant predicting higher optimum speeds for the higher contrast stimuli; i.e. there was a larger spatial shift of the receptive-field organization per unit time. Not only did the space-time maps of directional simple cells show different s...

Margaret S . Livingstone and Bevil R . Conway Macaque V 1 Receptive - Field Organization of Simple Cells in Contrast Affects Speed Tuning , Space - Time

Primate hunting by bonobos at LuiKotale, Salonga National Park

References 1. Sclar, G., Maunsell, J.H., and Lennie, P. (1990). Coding of image contrast in central visual pathways of the macaque monkey. Vision Res. 30, 1–10. 2. Shapley, R. (1990). Visual sensitivity and parallel retinocortical channels. Annu. Rev. Psychol. 41, 635–658. 3. Shapley, R.M., and Victor, J.D. (1978). The effect of contrast on the transfer properties of cat retinal ganglion cells....

Space-time maps and two-bar interactions of different classes of direction-selective cells in macaque V-1.

We used one-dimensional sparse noise stimuli to generate first-order spatiotemporal maps and second-order two-bar interaction maps for 65 simple and 124 complex direction-selective cells in alert macaque V1. Spatial and temporal phase differences between light and dark space-time maps clearly distinguished simple and complex cell populations. Complex cells usually showed similar direction prefe...

A study on surface slant encoding in V1

Inter-ocular differences in spatial frequency occur during binocular viewing of a surface slanted in depth. Cortical cells with inter-ocular differences in preferred spatial frequency (dif-frequency cells) are expected to detect surfaces slanted in depth or vertical surface slant. Using our reaction-diffusion model, we obtain receptive fields and responses of simple cells in layer IV in cat V1....