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Neuron. 2011 Oct 20;72(2):404-16. doi: 10.1016/j.neuron.2011.08.026.

A common, high-dimensional model of the representational space in human ventral temporal cortex.

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1
Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH 03755, USA. james.v.haxby@dartmouth.edu

Abstract

We present a high-dimensional model of the representational space in human ventral temporal (VT) cortex in which dimensions are response-tuning functions that are common across individuals and patterns of response are modeled as weighted sums of basis patterns associated with these response tunings. We map response-pattern vectors, measured with fMRI, from individual subjects' voxel spaces into this common model space using a new method, "hyperalignment." Hyperalignment parameters based on responses during one experiment--movie viewing--identified 35 common response-tuning functions that captured fine-grained distinctions among a wide range of stimuli in the movie and in two category perception experiments. Between-subject classification (BSC, multivariate pattern classification based on other subjects' data) of response-pattern vectors in common model space greatly exceeded BSC of anatomically aligned responses and matched within-subject classification. Results indicate that population codes for complex visual stimuli in VT cortex are based on response-tuning functions that are common across individuals.

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PMID:
22017997
PMCID:
PMC3201764
DOI:
10.1016/j.neuron.2011.08.026
[Indexed for MEDLINE]
Free PMC Article
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