M.Sc. CNS Visual Perception Concept of receptive field Stan Gielen Dept. of Biophysics.

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Presentation transcript:

M.Sc. CNS Visual Perception Concept of receptive field Stan Gielen Dept. of Biophysics

M.Sc. CNS Visual Perception What is a “receptive field” ? That part in stimulus space that affects the responses of a neuron: visual system: –direction in space, corresponding with a particular retinal area –frequency range in colour space auditory system: –frequency –direction relative to the head

M.Sc. CNS Visual Perception Retinal organization

M.Sc. CNS Visual Perception Origin of Centre-Surround organisation

M.Sc. CNS Visual Perception Receptive field in retina

M.Sc. CNS Visual Perception Local excitation; global inhibition

M.Sc. CNS Visual Perception 2D spatial receptive field

M.Sc. CNS Visual Perception 2D spatial receptive field Spatial frequency k

M.Sc. CNS Visual Perception 2D spatial receptive field centre surround

M.Sc. CNS Visual Perception Spatial contrast sensitivity O Centre only Centre plus surround

M.Sc. CNS Visual Perception 2D (spatio-)temporal receptive field h(t) log temp freq

M.Sc. CNS Visual Perception 2D spatio-temporal receptive field effect of centre-surround on temporal properties h(t) Stimulation of C + S: Higher sensitivity for high temporal frequencies

M.Sc. CNS Visual Perception Temporal sensitivity of Center

M.Sc. CNS Visual Perception Temporal sensitivity of C+S

M.Sc. CNS Visual Perception Spatial sensitivity of C+S

M.Sc. CNS Visual Perception Measured and simulated responses for cells with linear spatial summation On centerOff center DataModel

M.Sc. CNS Visual Perception Cells in Primary visual cortex

M.Sc. CNS Visual Perception Cortical receptive fields

M.Sc. CNS Visual Perception 2D spatial receptive field of center of cell in visual cortex

M.Sc. CNS Visual Perception 2D spatial receptive field of center of cell in visual cortex

M.Sc. CNS Visual Perception 2D spatial receptive field of center of cell in visual cortex kyky kxkx

M.Sc. CNS Visual Perception 2D spatial receptive field of cell in visual cortex kyky kxkx Surround causes sharpening of receptive field

M.Sc. CNS Visual Perception Spatial frequencies for testing visual receptive fields

M.Sc. CNS Visual Perception Visual vs auditory receptive field

M.Sc. CNS Visual Perception

Receptive field sizes Receptive fields form a local “Taylor expansion” of image

M.Sc. CNS Visual Perception References S. Shamma, On the role of space and time in auditory processing, Trends in Cognitive Sciences Vol.5,

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