EQUILUMINANCE CELLS IN VISUAL CORTICAL AREA V4
| Autor: | Anitha Pasupathy, Philip J. Harding, Yoshito Kosai, Brittany N. Bushnell, Wyeth Bair |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Male
Time Factors genetic structures Sensory Receptor Cells Color vision Luminance Article law.invention Contrast Sensitivity law medicine Reaction Time Animals Lighting Hue Visual Cortex Communication business.industry General Neuroscience Macaca mulatta Visual cortex medicine.anatomical_structure Pattern Recognition Visual Achromatic lens Evoked Potentials Visual Female business Psychology Neuroscience Color Perception Photic Stimulation |
| Popis: | We report a novel class of V4 neuron in the macaque monkey that responds selectively to equiluminant colored form. These “equiluminance” cells stand apart because they violate the well established trend throughout the visual system that responses are minimal at low luminance contrast and grow and saturate as contrast increases. Equiluminance cells, which compose ∼22% of V4, exhibit the opposite behavior: responses are greatest near zero contrast and decrease as contrast increases. While equiluminance cells respond preferentially to equiluminant colored stimuli, strong hue tuning is not their distinguishing feature—some equiluminance cells do exhibit strong unimodal hue tuning, but many show little or no tuning for hue. We find that equiluminance cells are color and shape selective to a degree comparable with other classes of V4 cells with more conventional contrast response functions. Those more conventional cells respond equally well to achromatic luminance and equiluminant color stimuli, analogous to color luminance cells described in V1. The existence of equiluminance cells, which have not been reported in V1 or V2, suggests that chromatically defined boundaries and shapes are given special status in V4 and raises the possibility that form at equiluminance and form at higher contrasts are processed in separate channels in V4. |
| Databáze: | OpenAIRE |
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