期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 3, 页码 1210-1215出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1314690111
关键词
light adaptation; cortical inhibition; laminar pattern
资金
- National Key Basic Research Program of China [2014CB846101]
- National Natural Science Foundation of China [31371110]
- Fundamental Research Funds for the Central Universities
- US National Institutes of Health [T32 EY-07158, R01 EY-01472]
- US National Science Foundation [0745253]
- Swartz Foundation
- Robert Leet and Clara Guthrie Patterson Trust
- STFC [ST/K001051/1] Funding Source: UKRI
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0745253] Funding Source: National Science Foundation
Darkness and brightness are very different perceptually. To understand the neural basis for the visual difference, we studied the dynamical states of populations of neurons in macaque primary visual cortex when a spatially uniform area (8 degrees x 8 degrees) of the visual field alternated between black and white. Darkness evoked sustained nerve-impulse spiking in primary visual cortex neurons, but bright stimuli evoked only a transient response. A peak in the local field potential (LFP)gamma band (30-80 Hz) occurred during darkness; white-induced LFP fluctuations were of lower amplitude, peaking at 25 Hz. However, the sustained response to white in the evoked LFP was larger than for black. Together with the results on spiking, the LFP results imply that, throughout the stimulus period, bright fields evoked strong net sustained inhibition. Such cortical brightness adaptation can explain many perceptual phenomena: interocular speeding up of dark adaptation, tonic interocular suppression, and interocular masking.
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