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• W2047094630 abstract "Neural mechanisms underlying invariant behaviour such as object recognition are not well understood. For brain regions critical for object recognition, such as inferior temporal cortex (ITC), there is now ample evidence indicating that single cells code for many stimulus aspects, implying that only a moderate degree of invariance is present. However, recent theoretical and empirical work seems to suggest that integrating responses of multiple non-invariant units may produce invariant representations at population level. We provide an explicit test for the hypothesis that a linear read-out mechanism of a pool of units resembling ITC neurons may achieve invariant performance in an identification task. A linear classifier was trained to decode a particular value in a 2-D stimulus space using as input the response pattern across a population of units. Only one dimension was relevant for the task, and the stimulus location on the irrelevant dimension (ID) was kept constant during training. In a series of identification tests, the stimulus location on the relevant dimension (RD) and ID was manipulated, yielding estimates for both the level of sensitivity and tolerance reached by the network. We studied the effects of several single-cell characteristics as well as population characteristics typically considered in the literature, but found little support for the hypothesis. While the classifier averages out effects of idiosyncratic tuning properties and inter-unit variability, its invariance is very much determined by the (hypothetical) 'average' neuron. Consequently, even at population level there exists a fundamental trade-off between selectivity and tolerance, and invariant behaviour does not emerge spontaneously." @default.
• W2047094630 created "2016-06-24" @default.
• W2047094630 creator A5007283385 @default.
• W2047094630 creator A5010720694 @default.
• W2047094630 date "2009-01-01" @default.
• W2047094630 modified "2023-10-16" @default.
• W2047094630 title "Neural representations that support invariant object recognition" @default.
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• W2047094630 doi "https://doi.org/10.3389/neuro.10.003.2009" @default.
• W2047094630 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2647334" @default.
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• W2047094630 hasPublicationYear "2009" @default.
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