Cerebral Cortex, Vol. 12, No. 11, 1202-1212,
November 2002
© 2002 Oxford University Press
Convergence of Visual and Tactile Shape Processing in the Human Lateral Occipital Complex
1 Neurobiology Department, Life Science Institute and , 2 Interdisciplinary Center for Neural Computation, Hebrew University, Jerusalem 91904, Israel, , 3 Wohl Institute for Advanced Imaging, Tel-Aviv Sourasky Medical Center, Israel and , 4 Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel
Address correspondence to Amir Amedi, Neurobiology Department, Life Science Institute, Hebrew University, Jerusalem 91904, Israel. Email: amir{at}lobster.ls.huji.ac.il.
We have recently demonstrated using fMRI that a region within the human lateral occipital complex (LOC) is activated by objects when either seen or touched. We term this cortical region LOtv for the lateral occipital tactile–visual region. We report here that LOtv voxels tend to be located in sub-regions of LOC that show preference for graspable visual objects over faces or houses. We further examine the nature of object representation in LOtv by studying its response to stimuli in three modalities: auditory, somatosensory and visual. If objects activate LOtv, irrespective of the modality used, the activation is likely to reflect a highly abstract representation. In contrast, activation specific to vision and touch may reflect common and exclusive attributes shared by these senses. We show here that while object activation is robust in both the visual and the somatosensory modalities, auditory signals do not evoke substantial responses in this region. The lack of auditory activation in LOtv cannot be explained by differences in task performance or by an ineffective auditory stimulation. Unlike vision and touch, auditory information contributes little to the recovery of the precise shape of objects. We therefore suggest that LOtv is involved in recovering the geometrical shape of objects.
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