T18_InvarObjRec_v2

Answer somewhere in the middle neurons are responding

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Unformatted text preview: h the brain? Answer: somewhere in the middle Neurons are responding to something about “objects” (not just features) in IT IT neurons are not all specific object detectors How does the neural code for objects change as signals propagate through the brain? Hypothesis 1: the brain builds up object detectors (table detectors, face detectors) “Sparse representation” IT? V4? V2? V1 Where (reds) What (blues) John Maunsell, after Peter Lennie after Felleman & Van Essen, 1991 Neurons in V2 .... ARTICLES a 2 Neurons in V2 .... b V2 1.0 1 0.5 0 0 –0.5 –1 –2 –2 d V2 24 spikes per s 0 –1.0 2 V2 11 spikes per s –1 e 2 0 1 V2 1 y (°) 1 0 0 –1 –1 16 spikes per s –2 14 spikes per s c2 Figure maps Respo 1 to the are plo 0 stimul hexag –1 locatio –2 to obt 18 spikes per s secon –2 0 2 indica by the V1 Orient 0.5 the 3 for the were r 0 circle. tuned –0.5 V2 ne Anzai, Peng, Van Essen 2007) (b–e 32 spikes per s f V2 ARTICLES a 2 Neurons in V2 .... b V2 1.0 1 0.5 0 0 –0.5 –1 –2 –2...
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