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Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex

Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex. Frank Tong, Ken Nakayama, J. Thomas Vaughan, and Nancy Kanwisher Department of Psychology Harvard University Neuron, Vol. 21 753-759, October 1998. Talk Outline. B A C K G R O U N D. M E T H O D S. R E S U L T S.

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Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex

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  1. Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex Frank Tong, Ken Nakayama, J. Thomas Vaughan, and Nancy KanwisherDepartment of PsychologyHarvard UniversityNeuron, Vol. 21 753-759, October 1998

  2. Talk Outline B A C K G R O U N D M E T H O D S R E S U L T S C O N C L U S I O N

  3. B A C K G R O U N D

  4. Monocular Rivalry Examples

  5. J Binocular Rivalry J Brain 1 Perception 2 Stimuli

  6. J Binocular Rivalry Brain 1 Perception 2 Stimuli

  7. J LGN PVC Where is rivalry resolved? ??? • First guess: LGN or PVC • But, single-unit recordings in monkeys…

  8. J LGN PVC Where is rivalry resolved? FFAPPA FFA = Fusiform Face Area PPA = Parahippocampal Place Area

  9. M E T H O D S

  10. Creating binocular rivalry

  11. fMRI Scans • Localizer Scans • Rivalry Scans • Non-rivalry Scans Four healthy right-handed human subjects, aged 20-39.

  12. 1. Localizer Scans • Alternating house and face stimuli • Locate FFA and PPA

  13. Localizer Scan(In actual experiment, stimuli were presented for 16 second intervals.)

  14. 1. Localizer Scans • Alternating house and face stimuli • Locate FFA and PPA

  15. 2. Rivalry Scans • Present single rivalry-causing stimulus • Record timing of subject-reported dominant percept

  16. Rivalry Scan

  17. 2. Rivalry Scans • Present single rivalry-causing stimulus • Record timing of subject-reported dominant percept

  18. 3. Non-rivalry Scans • Alternating house and face stimuli • Present stimuli in identical temporal sequence reported during rivalry scans

  19. Non-Rivalry Scan(Stimuli presented in same sequence and duration as reported in rivalry scan.)

  20. 3. Non-rivalry Scans • Alternating house and face stimuli • Present stimuli in identical temporal sequence reported during rivalry scans

  21. R E S U L T S

  22. 1. Localizer Scans FFA = Fusiform Face Area PPA = Parahippocampal Place Area

  23. Localizer Scans – Raw Data FFA = Fusiform Face Area PPA = Parahippocampal Place Area

  24. Rivalry Scans – Raw Data FFA = Fusiform Face Area PPA = Parahippocampal Place Area

  25. Averaged Transition Data

  26. Everything together

  27. C O N C L U S I O N

  28. What can we conclude? • FFA & PPA are confirmed. • FFA & PPA activity matches perception. • And back to our original question…

  29. J LGN PVC Upper bound on rivalry resolution FFAPPA FFA = Fusiform Face Area PPA = Parahippocampal Place Area

  30. Executive Summary Where is rivalry resolved? B A C K G R O U N D Chic glasses + fMRI.3 experiments. M E T H O D S FFA & PPA respond the same for rivalry and non-rivalry. R E S U L T S Rivalry is resolved before these stages of processing. C O N C L U S I O N

  31. Questions?

  32. Picture of cool guy in glasses taken from: http://bill.innanen.com/ parkinsons/diary200110.shtml

  33. Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex Frank Tong, Ken Nakayama, J. Thomas Vaughan, and Nancy KanwisherDepartment of PsychologyHarvard UniversityNeuron, Vol. 21 753-759, October 1998 Presented by Stan James and Mayumi Koguchi stan@wanderingstan.com koguchischoepf@tiscali.de

  34. Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex Frank Tong, Ken Nakayama, J. Thomas Vaughan, and Nancy KanwisherDepartment of PsychologyHarvard UniversityNeuron, Vol. 21 753-759, October 1998 Presented by Stan James and Mayumi Koguchi stan@wanderingstan.com koguchischoepf@tiscali.de

  35. Executive Summary Where is rivalry resolved? Stylish glasses, fMRI FFA & PPA respond the same for rivalry and non. Rivalry is resolved before these stages of processing. B A C K G R O U N D M E T H O D S R E S U L T S C O N C L U S I O N

  36. 2. Rivalry Scans – Raw Data FFA = Fusiform Face Area PPA = Parahippocampal Place Area

  37. Still not convinced?

  38. Rivalry

  39. J Binocular Rivalry J Brain 1 Perception 2 Stimuli

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