Gamma frequency feedback inhibition accounts for key aspects of orientation selectivity in V1
نویسندگان
چکیده
منابع مشابه
Orientation selectivity and noise correlation in awake monkey area V1 are modulated by the gamma cycle.
Gamma-band synchronization adjusts the timing of excitatory and inhibitory inputs to a neuron. Neurons in the visual cortex are selective for stimulus orientation because of dynamic interactions between excitatory and inhibitory inputs. We hypothesized that these interactions and hence also orientation selectivity vary during the gamma cycle. We determined for each spike its phase relative to t...
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We addressed how spatial frequency and orientation selectivity coexist and co-vary in Macaque primary visual cortex (V1) by simulating cortical layer 4Cα of V1 with a large-scale network model and then comparing the model's behavior with a population of cells we recorded in layer 4Cα. We compared the distributions of orientation and spatial frequency selectivity, as well as the correlation betw...
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Form has a strong influence on color perception. We investigated the neural basis of the form-color link in macaque primary visual cortex (V1) by studying orientation selectivity of single V1 cells for pure color patterns. Neurons that responded to color were classified, based on cone inputs and spatial selectivity, into chromatically single-opponent and double-opponent groups. Single-opponent ...
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We studied the steady-state orientation selectivity of single neurons in macaque primary visual cortex (V1). To analyze the data, two measures of orientation tuning selectivity, circular variance and orientation bandwidth, were computed from the tuning curves. Circular variance is a global measure of the shape of the tuning curve, whereas orientation bandwidth is a local measure of the sharpnes...
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Several models exist for explaining V1 orientation tuning. The modified feedforward model (MFM) and the recurrent model (RM) are major examples. We have implemented, at the same level of detail, these two models alongside a few newer variations, and thoroughly compared their receptive-field structures. We found that anti-phase inhibition in the MFM enhances both spatial phase information and or...
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ژورنال
عنوان ژورنال: Network: Computation in Neural Systems
سال: 2014
ISSN: 0954-898X,1361-6536
DOI: 10.3109/0954898x.2013.877611