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Sensation & Perception

Ψ. Sensation & Perception. Ψ. -Discussion Section- Session 6 – Beyond V1 Illusory Contours Context Effects. Administrative stuff. Presentation 1: Illusory Contours and Cortical Neuron Responses (1984) presented by Robert Wilson.

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Sensation & Perception

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  1. Ψ Sensation & Perception

  2. Ψ -Discussion Section- Session 6 – Beyond V1 Illusory Contours Context Effects

  3. Administrative stuff

  4. Presentation 1:Illusory Contours and Cortical Neuron Responses (1984)presented by Robert Wilson Presentation 2:Visual responses in monkey areas V1 and V2 to three-dimensional surface configurations (2000)presented by Tara McCrimmon

  5. Next week • Week 7: SfN 2005 – • Conference! • No Class • No Readings • No Section • MIDTERM (sans Dave, me, other TAs)

  6. The future Week 7: 11/14/2005, 11/15/2005; Away at conference, no session no readings Week 8: 11/21/2005, 11/22/2005; Higher visual perception: Objects and Space Paper 1 (Classic): Mishkin et al., 1983 Paper 2 (Modern): Logothetis et al., 2002

  7. BACKGROUND

  8. This weeks issues:

  9. Issues: • How does SF fit into the organizational structure of V1? • How come we perceive illusory contours? • What does V2 do that V1 doesn’t do? • Implications for RF model? • Bug or feature?

  10. Naoum P. Issa (UofC) Michael P. Stryker The organization of Spatial frequency in V1

  11. SF/Contrast

  12. V1 vs. extrastriate visual

  13. Illusory contours • Have been studied psychophysically for a long time • Physiological investigation of illusory contours a recent phenomenon • Raises a lot of interesting issues • Highly dependent on visual experience, cortical plasticity

  14. Ruediger von der Heydt (John-Hopkins University)

  15. Issues • Mind/Body: See it in the mind, see it in the brain • Context phenomena. Structure in the world. Used to segment image • Suggestion of a “nonclassical” receptive field • Awake, behaving monkeys

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