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- Title
A Retinal Source of Spatial Contrast Gain Control.
- Authors
Scholl, Benjamin; Latimer, Kenneth W.; Priebe, Nicholas J.
- Abstract
Sensory cortex is able to encode a broad range of stimulus features despite a great variation in signal strength. In cat primary visual cortex (V1), for example, neurons are able to extract stimulus features like orientation or spatial configuration over a wide range of stimulus contrasts. The contrast-invariant spatial tuning found in V1 neuron responses has been modeled as a gain control mechanism, but at which stage of the visual pathway it emerges has remained unclear. Here we describe our findings that contrast-invariant spatial tuning occurs not only in the responses of lateral geniculate nucleus (LGN) relay cells but also in their afferent retinal input. Our evidence suggests that a similar contrast-invariant mechanism is found throughout the stages of the early visual pathway, and that the contrastinvariant spatial selectivity is evident in both retinal ganglion cell and LGN cell responses.
- Subjects
RETINA; SPATIAL ability; STIMULUS &; response (Biology); CELLULAR signal transduction; CATS as laboratory animals; VISUAL cortex; NEURONS; VISUAL pathways
- Publication
Journal of Neuroscience, 2012, Vol 32, Issue 29, p9824
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.0207-12.2012