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Receptive Field Dynamics in Adult Primary Visual Cortex

Receptive Field Dynamics in Adult Primary Visual Cortex. Group A3 Presenters: Anastasia Christopher, Carol Rego , Sarah McNeil Technical Experts: Bonnie Chan, Herman Gill, Marisa Leung. Anastasia Christopher. Table of Contents. Brief overview of Module 3

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Receptive Field Dynamics in Adult Primary Visual Cortex

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  1. Receptive Field Dynamics in Adult Primary Visual Cortex Group A3 Presenters: Anastasia Christopher, Carol Rego, Sarah McNeil Technical Experts: Bonnie Chan, Herman Gill, Marisa Leung

  2. Anastasia Christopher Table of Contents • Brief overview of Module 3 • Background information and important definitions • Anatomy of the brain • Lateral Geniculate Nucleus • Method • Results • Primary Visual Cortex • Method • Results • Conclusion

  3. Anastasia Christopher Receptive Field Dynamics in Adult Primary Visual Cortex By: Charles Gilbert and Torsten Wiesel

  4. Anastasia Christopher Important Definitions • Cortical Topography • Binocular Retinal Lesion • Scotoma Receptive Field Size

  5. Anastasia Christopher Is the locus of change in regards to sensory input located at the cortical level (Primary Visual Cortex) or at a prior stage in the sensory pathway (Lateral Geniculate Nucleus)?

  6. Anastasia Christopher Lateral Geniculate Nucleus (LGN)

  7. Anastasia Christopher Primary Visual Cortex

  8. Anastasia Christopher

  9. Carol Rego LGN - Methods • Studied 2 cats and 1 monkey • Topographical mapping of the LGN • Multiple electrode penetrations across the LGN • Two injections of retrograde tracers in V1

  10. Carol Rego LGN – Electrode Readings • Large silent area about 1mm in diameter • Shift in RF position

  11. Carol Rego

  12. Sarah McNeil Primary Visual Cortex - Methods • Studied 4 cats and 6 monkeys • RF maps were made using vertical electrode penetration • RF maps were made at the same sites before, immediately after, and 2 months after making the lesion

  13. Sarah McNeil Primary Visual Cortex - Results • Immediately after: • Inactivity in original sites • 5X larger sites • Centrifugal shift Before lesion Immediately after lesion

  14. Sarah McNeil Primary Visual Cortex - Results • 2 months after: • RF field size shrunk • 5˚ centrifugal shift in position • Area of activity expanded beyond affected area Before Lesion 2 Months After Lesion

  15. Sarah McNeil • Initial shock • Long term consolidation

  16. Sarah McNeil

  17. Anastasia Christopher Is the locus of change in regards to sensory input located at the cortical level (Primary Visual Cortex) or at a prior stage in the sensory pathway (Lateral Geniculate Nucleus)?

  18. Anastasia Christopher Conclusion • Brain is high in plasticity • Compensation of damaged tissue as a result of binocular retinal lesions does not take place in LGN • Takes place at the cortical level of V1

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