the neural basis of object and face recognition
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The neural basis of Object and face recognition. 0. 2. TE receptive field. V1 receptive field. V4 receptive field. Ventral pathway receptive field properties. Firing rate. Stimulus. Responses of IT neurons to various stimuli. Neural Coding. - PowerPoint PPT PresentationTRANSCRIPT
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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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