期刊
JOURNAL OF NEUROSCIENCE
卷 32, 期 29, 页码 9824-9830出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.0207-12.2012
关键词
-
资金
- National Institutes of Health [EY-019288]
- Pew Charitable Trusts
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 contrast-invariant spatial selectivity is evident in both retinal ganglion cell and LGN cell responses.
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