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Binocular Rivalry  and Visual Awareness  in Human Extrastriate Cortex Frank Tong, Ken Nakayama, J. Thomas Vaughan,  and Na...
Talk Outline M E T H O D S B A C K G R O U N D R E S U L T S C O N C L U S I O N
B A C K G R O U N D
Monocular Rivalry Examples
Binocular Rivalry  Brain 2 Stimuli 1 Perception 
Binocular Rivalry Brain 2 Stimuli 1 Perception 
Where is rivalry resolved? <ul><li>First guess: LGN or PVC </li></ul><ul><li>But, single-unit recordings in monkeys…  </li...
Where is rivalry resolved? FFA  = Fusiform  Face  Area PPA  = Parahippocampal  Place  Area FFA PPA  LGN PVC
M E T H O D S
Creating binocular rivalry
fMRI Scans <ul><li>Localizer Scans </li></ul><ul><li>Rivalry Scans </li></ul><ul><li>Non-rivalry Scans </li></ul>Four heal...
1. Localizer Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Locate FFA and PPA </li></ul>
Localizer Scan (In actual experiment, stimuli were presented for 16 second intervals.)
1. Localizer Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Locate FFA and PPA </li></ul>
2. Rivalry Scans <ul><li>Present single rivalry-causing stimulus </li></ul><ul><li>Record timing of subject-reported domin...
Rivalry Scan
2. Rivalry Scans <ul><li>Present single rivalry-causing stimulus </li></ul><ul><li>Record timing of subject-reported domin...
3. Non-rivalry Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Present stimuli in identical temporal se...
Non-Rivalry Scan (Stimuli presented in same sequence and duration as reported in rivalry scan.)
3. Non-rivalry Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Present stimuli in identical temporal se...
R E S U L T S
1. Localizer Scans FFA  = Fusiform  Face  Area PPA  = Parahippocampal  Place  Area
Localizer Scans – Raw Data FFA  = Fusiform  Face  Area PPA  = Parahippocampal  Place  Area
Rivalry Scans – Raw Data FFA  = Fusiform  Face  Area PPA  = Parahippocampal  Place  Area
Averaged Transition Data
Everything together
C O N C L U S I O N
What can we conclude? <ul><li>FFA & PPA are confirmed. </li></ul><ul><li>FFA & PPA activity matches perception. </li></ul>...
Upper bound on rivalry resolution FFA  = Fusiform  Face  Area PPA  = Parahippocampal  Place  Area FFA PPA  LGN PVC
Executive Summary M E T H O D S B A C K G R O U N D R E S U L T S C O N C L U S I O N Where is rivalry resolved? Chic glas...
Questions?
 
<ul><li>Picture of cool guy in glasses taken from: http:// bill.innanen.com / parkinsons/diary200110.shtml   </li></ul>
Binocular Rivalry  and Visual Awareness  in Human Extrastriate Cortex Frank Tong, Ken Nakayama, J. Thomas  Vaughan,  and N...
Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex Frank Tong, Ken Nakayama, J. Thomas Vaughan,  and Nanc...
Executive Summary M E T H O D S B A C K G R O U N D R E S U L T S C O N C L U S I O N Where is rivalry resolved? Stylish g...
 
2. Rivalry Scans – Raw Data FFA  = Fusiform  Face  Area PPA  = Parahippocampal  Place  Area
Still not convinced?
Rivalry
Binocular Rivalry Brain  2 Stimuli 1 Perception 
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Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex

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A presentation concerning the paper "Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex " by Frank Tong, Ken Nakayama, J. Thomas Vaughan, and Nancy Kanwisher Department of Psychology Harvard University Neuron, Vol. 21 753-759, October 1998

Created by Stan James while a student at the University of Osnabrück, Germany

Published in: Health & Medicine
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Binocular Rivalry and Visual Awareness in Human Extrastriate Cortex

  1. 1. 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
  2. 2. Talk Outline M E T H O D S B A C K G R O U N D R E S U L T S C O N C L U S I O N
  3. 3. B A C K G R O U N D
  4. 4. Monocular Rivalry Examples
  5. 5. Binocular Rivalry  Brain 2 Stimuli 1 Perception 
  6. 6. Binocular Rivalry Brain 2 Stimuli 1 Perception 
  7. 7. Where is rivalry resolved? <ul><li>First guess: LGN or PVC </li></ul><ul><li>But, single-unit recordings in monkeys… </li></ul>???  LGN PVC
  8. 8. Where is rivalry resolved? FFA = Fusiform Face Area PPA = Parahippocampal Place Area FFA PPA  LGN PVC
  9. 9. M E T H O D S
  10. 10. Creating binocular rivalry
  11. 11. fMRI Scans <ul><li>Localizer Scans </li></ul><ul><li>Rivalry Scans </li></ul><ul><li>Non-rivalry Scans </li></ul>Four healthy right-handed human subjects, aged 20-39.
  12. 12. 1. Localizer Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Locate FFA and PPA </li></ul>
  13. 13. Localizer Scan (In actual experiment, stimuli were presented for 16 second intervals.)
  14. 14. 1. Localizer Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Locate FFA and PPA </li></ul>
  15. 15. 2. Rivalry Scans <ul><li>Present single rivalry-causing stimulus </li></ul><ul><li>Record timing of subject-reported dominant percept </li></ul>
  16. 16. Rivalry Scan
  17. 17. 2. Rivalry Scans <ul><li>Present single rivalry-causing stimulus </li></ul><ul><li>Record timing of subject-reported dominant percept </li></ul>
  18. 18. 3. Non-rivalry Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Present stimuli in identical temporal sequence reported during rivalry scans </li></ul>
  19. 19. Non-Rivalry Scan (Stimuli presented in same sequence and duration as reported in rivalry scan.)
  20. 20. 3. Non-rivalry Scans <ul><li>Alternating house and face stimuli </li></ul><ul><li>Present stimuli in identical temporal sequence reported during rivalry scans </li></ul>
  21. 21. R E S U L T S
  22. 22. 1. Localizer Scans FFA = Fusiform Face Area PPA = Parahippocampal Place Area
  23. 23. Localizer Scans – Raw Data FFA = Fusiform Face Area PPA = Parahippocampal Place Area
  24. 24. Rivalry Scans – Raw Data FFA = Fusiform Face Area PPA = Parahippocampal Place Area
  25. 25. Averaged Transition Data
  26. 26. Everything together
  27. 27. C O N C L U S I O N
  28. 28. What can we conclude? <ul><li>FFA & PPA are confirmed. </li></ul><ul><li>FFA & PPA activity matches perception. </li></ul><ul><li>And back to our original question… </li></ul>
  29. 29. Upper bound on rivalry resolution FFA = Fusiform Face Area PPA = Parahippocampal Place Area FFA PPA  LGN PVC
  30. 30. Executive Summary M E T H O D S B A C K G R O U N D R E S U L T S C O N C L U S I O N Where is rivalry resolved? Chic glasses + fMRI. 3 experiments. FFA & PPA respond the same for rivalry and non-rivalry. Rivalry is resolved before these stages of processing.
  31. 31. Questions?
  32. 33. <ul><li>Picture of cool guy in glasses taken from: http:// bill.innanen.com / parkinsons/diary200110.shtml </li></ul>
  33. 34. 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 Presented by Stan James and Mayumi Koguchi [email_address] [email_address]
  34. 35. 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 Presented by Stan James and Mayumi Koguchi [email_address] [email_address]
  35. 36. Executive Summary M E T H O D S B A C K G R O U N D R E S U L T S C O N C L U S I O N Where is rivalry resolved? Stylish glasses, fMRI FFA & PPA respond the same for rivalry and non. Rivalry is resolved before these stages of processing.
  36. 38. 2. Rivalry Scans – Raw Data FFA = Fusiform Face Area PPA = Parahippocampal Place Area
  37. 39. Still not convinced?
  38. 40. Rivalry
  39. 41. Binocular Rivalry Brain  2 Stimuli 1 Perception 

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