The neural basis of Object and face recognition
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Transcript of The neural basis of Object and face recognition
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The neural basis ofObject and face recognition
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Ventral pathway receptive field properties 0
2
TE receptive fieldV4 receptive field V1 receptive field
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Responses of IT neurons to various stimuli
Fir
ing
rate
Stimulus
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Neural Coding
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The question of specificity:Is a face cell truly a “face specific”
#1
#10 #100
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Face selectivity in single units human MTL(Jennifer Aniston cell)
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Face selectivity in single units human MTL
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Face neuron clusters in IT
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Responses of IT (TE)
neurons
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Tanaka’s stimulus reduction method
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Tanaka et al, 1991
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Tanaka Features
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Columns in IT
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Optical imaging in IT cortex
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Columns in IT (seen with optical imaging)
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Columns in IT
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Microstimulation of face populations in IT
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Cortical Microstimulation biases perceptual decisions
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fMRIfMRI
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The human visual pathways
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Malach et al., PNAS 1995
Object-Selective Regions in the Human BrainLateral Occipital Complex: LOC
10-4
10-4
10-10
10-4
10-10
right hemisphere
lateral view
ventral view
left hemisphere
>
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Grill-Spector et al. , Neuron 1998
Objects from motion
Objects from texture
Objects from luminance
Cue-independent representations
Left hemisphere
lateral
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Are Faces Special?Are Faces Special?Having a dedicated Having a dedicated
representationrepresentation
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Face-related activation
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Whole vs. Parts
12V41664256 2h
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Whole vs. Parts
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Face blindness (Prosopagnosia)
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Is face blindness associated witha disfunctional FFA
NO!
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But it may depend on the integrity of the face network
(its connections with other areas)
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Functional organization of the human ventral areas
Hasson et al., 2003
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Distributed & overlapping representation of
faces & objects in ventral temporal cortex
Haxby et al., 2001
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Mapping the similarity between visual categories
Kriegskorte et al., 2008
A division between animate and inanimate objects
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Mapping is similar in humans and monkeys
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