Fine-scale organization and key dimensions of visual object representation in macaque inferotemporal cortex
Speaker: Chou P. Hung, Ph.D. , Assistant Professor, National Yang-Ming Univ. Taipei, Taiwan
Date: August 15 2011
Time: 3:15PM to 4:00PM
Location: McGovern Seminar Room, MIT 46-3189
Host: Prof. Tomaso Poggio, MIBR, BCS Dept., CSAIL
Contact: Kathleen Sullivan, (617) 253-0551, kdsulliv@mit.edu
Relevant URL: http://cbcl.mit.edu/*Time change - now starting 3:15pm*
Abstract: A major challenge in understanding visual object recognition is to decode the precise and non-linear mapping of object features, computations, and circuits in inferior temporal (IT) cortex (and its human counterpart the lateral occipital complex and fusiform gyrus), the last stage of object form processing. The factors that predict response and map variability are unclear, and this variability makes it difficult to confirm and extrapolate feature-specific rules across stimuli, cells, animals, and investigators. To relate the fine organization to feature computations and circuitry, we have developed a novel approach based on multi-electrode array recordings of spiking activity. By applying pattern classifiers and covariation analysis, we compared the object content across different maps (random, columnar, PCA, ICA) and use functional circuitry analysis and imaging (OI, human fMRI) to confirm the robustness of these key dimension maps and their reliability across subjects and species. This robustness should enable iterative refinement and build-out of the map via repeated recordings targeted to the same coalitions across animals.
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