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

2. 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

3. M.Sc. CNS Visual Perception Retinal organization

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

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

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

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

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

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

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

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

12. 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

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

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

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

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

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

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

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

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

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

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

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

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

25. M.Sc. CNS Visual Perception

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

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