On the contrast response function of adapted neural populations
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Updated: Jul 5, 2025

Visualizing Visual Adaptation
Published on: April 24, 2017
Elaine Tring1, Mario Dipoppa1, Dario L Ringach2,1
1Department of Neurobiology, David Geffen School of Medicine, University of California, Los Angeles, California, United States.
Abstract:
The magnitude of neural responses in sensory cortex depends on the intensity of a stimulus and its probability of being observed within the environment. How these two variables combine to influence the overall response of cortical populations remains unknown. Here we show that, in primary visual cortex, the vector magnitude of the population response is described by a separable power law that factors the intensity of a stimulus and its probability. Moreover, the discriminability between two contrast levels in a cortical population is proportional to the logarithm of the contrast ratio.NEW & NOTEWORTHY The magnitude of neural responses in sensory cortex depends on the intensity of a stimulus and its probability of being observed within the environment. The authors show that, in primary visual cortex, the vector magnitude of the population response is described by a separable power law that factors the intensity of a stimulus and its probability.
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