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Generalization over contrast and mirror reversal, but not figure-ground reversal, in an "edge-based

Baylis & Driver (Nature Neuroscience, 2001) have recently presented data on the response of neurons in macaque inferotemporal cortex (IT) to various stimulus transformations. They report that neurons can generalize over contrast and mirror reversal, but not over figure-ground reversal. This finding is taken to demonstrate that ``the selectivity of IT neurons is not determined simply by the distinctive contours in a display, contrary to simple edge-based models of shape recognition'', citing our recently presented model of object recognition in cortex (Riesenhuber & Poggio, Nature Neuroscience, 1999). In this memo, I show that the main effects of the experiment can be obtained by performing the appropriate simulations in our simple feedforward model. This suggests for IT cell tuning that the possible contributions of explicit edge assignment processes postulated in (Baylis & Driver, 2001) might be smaller than expected.

Identiferoai:union.ndltd.org:MIT/oai:dspace.mit.edu:1721.1/7265
Date10 December 2001
CreatorsRiesenhuber, Maximilian
Source SetsM.I.T. Theses and Dissertation
Languageen_US
Detected LanguageEnglish
Format3 p., 798352 bytes, 91696 bytes, application/postscript, application/pdf
RelationAIM-2001-034, CBCL-211

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