CORTICAL PROCESSING: EXTRA- CLASSICAL RECEPTIVE FIELD … · 2019. 4. 24. · 3. Kapadia MK, Ito M,...
Transcript of CORTICAL PROCESSING: EXTRA- CLASSICAL RECEPTIVE FIELD … · 2019. 4. 24. · 3. Kapadia MK, Ito M,...
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CORTICAL PROCESSING: EXTRA-CLASSICAL RECEPTIVE FIELD
INFLUENCESINFLUENCES
Valentin Dragoi
Department of Neurobiology and Anatomy
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Surround effects in retina
Center Response Surround Response Opponent Field Response
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Neuronal circuits incircuits in striate cortex
Cells with i ilsimilar
function are linked through ghorizontal connections
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Filling-in effect in visual cortex (De Weerd et alFilling in effect in visual cortex (De Weerd et al, 1995)
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Stimulus collinearity: psychophysical y p y p yresults (Kapadia et al, 1995)
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Stimulus collinearity: psychophysical y p y p yresults (Kapadia et al, 1995)
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Stimulus collinearity in monkey visual cortex (Kapadia et al, 1995)
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Center-surround interactions in primary visual cortex (adapted from Levitt and Lund 1997)visual cortex (adapted from Levitt and Lund, 1997)
A: spatial arrangement of the receptive field center and surround used to investigate contextual effects. The center ggrating stimulus is surrounded by a larger annulus field with the same mean luminance. B: responses to the high-contrast optimal center stimulus paired with high contrast surround gratings ofwith high-contrast surround gratings of varying orientations. Cells 1 and 2 are adapted from Fig. 1, A and D, of Levitt and Lund (1997) . C: responses to the low-contrast optimal center stimulus paired with high-contrast surround gratings of varying orientations. Cells 3 and 4 are adapted from Fig. 1, D and E, of Levitt and Lund (1997) . Dashed lines in all panels indicate response to the optimal stimulusindicate response to the optimal stimulus alone.
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Model of center-surround interactionssurround interactions in primary visual cortex (Dragoi and Surcortex (Dragoi and Sur, 2000)
Orientation- and contrast-dependent suppression and facilitation. A: responses to high-contrast optimal center stimulus (contrast 100%) paired with high-contrast surround of varying orientation ( ) and to y g ( )surround stimulus alone ( ). Center contrast and surround orientation values are identical with those used by Levitt and Lund (1997) . B: responses to the low-contrast optimal center stimulus (contrast 15%) paired with a high contrast surround of varying15%) paired with a high-contrast surround of varying orientation ( ) and to the surround stimulus alone ( ). Center contrast and surround orientation values are identical with those used by Levitt and Lund (1997) . Dashed lines: response to the optimal stimulus alone (high center contrast value is 100% in A; low center contrast value is 15% in B).
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Model of center-d i t tisurround interactions
in V1 (Dragoi and Sur, 2000)
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Pop-out effect
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What is the function of horizontal connections?
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Geometrical illusions
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Examples of geometrical illusions
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Surround stimulation increases response sparseness in V1 (Vinje and Gallant, 2000)
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Surround effects in rat somatosensoryycortex (Moore et al, 1999)
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S ffSurround effects in rat somatosensorycortex (Moore et al, 1999)
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Model of center-surround interactions in rat S1 (Moore et al, 1999)
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Suggested readingsSuggested ead gs
1. De Weerd P, Gattass R, Desimone R, Ungerleider LG. Responses of cells in monkey visual cortex during perceptual filling-in of an artificial scotoma. Nature. 1995 Oct 26;377(6551):731-4.
2. Levitt JB, Lund JS. Contrast dependence of contextual effects in primate visual cortex. Nature. 1997 May 1;387(6628):73-6.
3. Kapadia MK, Ito M, Gilbert CD, Westheimer G. Improvement in visual sensitivity by p p y ychanges in local context: parallel studies in human observers and in V1 of alert monkeys. Neuron. 1995 Oct;15(4):843-56.
4. Vinje WE, Gallant JL. Sparse coding and decorrelation in primary visual cortex during j p g p y gnatural vision. Science. 2000 Feb 18;287(5456):1273-6.
5. Moore CI, Nelson SB, Sur M. Dynamics of neuronal processing in rat somatosensorycortex. Trends Neurosci. 1999 Nov;22(11):513-20. Review.( )