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Concept of receptive field

Concept of receptive field. Stan Gielen Dept. of Biophysics. 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:

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Concept of receptive field

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

  2. 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

  3. Retinal organization M.Sc. CNS Visual Perception

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

  5. Receptive field in retina M.Sc. CNS Visual Perception

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

  7. 2D spatial receptive field M.Sc. CNS Visual Perception

  8. 2D spatial receptive field Spatial frequency k M.Sc. CNS Visual Perception

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

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

  11. 2D (spatio-)temporal receptive field h(t) log temp freq M.Sc. CNS Visual Perception

  12. 2D spatio-temporal receptive fieldeffect of centre-surround on temporal properties Stimulation of C + S: Higher sensitivity for high temporal frequencies h(t) M.Sc. CNS Visual Perception

  13. Temporal sensitivity of Center M.Sc. CNS Visual Perception

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

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

  16. Measured and simulated responsesfor cells with linear spatial summation Data Model On center Off center M.Sc. CNS Visual Perception

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

  18. Cortical receptive fields M.Sc. CNS Visual Perception

  19. 2D spatial receptive field of center of cell in visual cortex M.Sc. CNS Visual Perception

  20. 2D spatial receptive field of center of cell in visual cortex M.Sc. CNS Visual Perception

  21. 2D spatial receptive field of center of cell in visual cortex ky kx M.Sc. CNS Visual Perception

  22. 2D spatial receptive field of cell in visual cortex ky Surround causes sharpening of receptive field kx M.Sc. CNS Visual Perception

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

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

  25. M.Sc. CNS Visual Perception

  26. Receptive field sizes Receptive fields form a local “Taylor expansion” of image M.Sc. CNS Visual Perception

  27. References • S. Shamma, On the role of space and time in auditory processing, Trends in Cognitive Sciences Vol.5, 340-348 2001 M.Sc. CNS Visual Perception

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