Face Recognition in the Brain

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• Face Recognition in the Brain
• Arash Afraz

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• How Does the Brain Represent FACE???

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• Electrophysiological Studies
• Imaging Studies
• Behavioral Studies

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• Electro
• -physiological
• Studies

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• Face selective neurons in the temporal cortex of
  monkey were reported in 1972.

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• TE ? Face Identity
• STS ? Facial Expression

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Neural Encoding!?!?
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• Global Categories Monkey, Human Shape.
• Fine Categories Monkey Identity (F1), Monkey
  Expression (F2), Human Identity (F3) Human
  Expression (F4)

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I See a face a happy face!
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Latency Coding in Face neurons?
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Imaging Studies
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Fusiform Face Area

• Imaging studies (Nancy Kanwisher).

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• Face neurons are clustered in ventral visual
  pathway in few patches (say 5 or 6)
• Amount and distribution of face selective patches
  are similar in humans and monkeys

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Optical Imaging investigations convey the same
results.
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• Behavioral
• Studies

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Face Inversion Effects
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Face Inversion Effects
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Face Inversion Effects
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Face Inversion Effects
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Laterality in Perceiving Facial Expression
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Prosopagnosia
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Adaptation and After-effects in Face Perception!?
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Simple Adaptations
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What about high level visual stimuli like faces?
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• Morphing
• Computerized
• Controlled
• Distortion of
• Faces

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Effect of inversion
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Effect of translation
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A simple experiment!
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Adaptation
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Test!
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Adaptation
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Test!
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A simple experiment!
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Use of adaptation paradigms in investigating
higher level questions

• Face adaptation is reduced by binocular
  suppression.
• Farshad Moradi , Christof Koch, Shinsuke Shimojo

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New ProspectsFace as a dynamic visual stimulus
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• Facial mimic and Facial Motion

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