The dissociation of color from form and function knowledge

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Abstract

We report on two brain-damaged subjects who exhibit the uncommon pattern of loss of object color knowledge, but spared color perception and naming. The subject P.C.O., as in previously reported patients, is also impaired in processing other perceptual and functional properties of objects. I.O.C., in contrast, is the first subject on record to have impaired object color knowledge, but spared knowledge of object form, size and function. This pattern of performance is consistent with the view that semantic information about color and other perceptual properties of objects is grounded in modality-specific systems. Lesion analysis suggests that such grounding requires the integrity of the mesial temporal regions of the left hemisphere.

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Figure 1: Examples of the drawing and object-coloring performance of patients P.C.O. and I.O.C.
Figure 2: Representative axial MRI sections and schematic representation of mesial temporal and temporo-occipital damage for the three subjects.

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Acknowledgements

This research was supported by NIH grant DC04245, and by a grant from MURST. We thank I.O.C., P.C.O. and S.L.A. for their participation in this study. We also thank P. Cavanagh, K. Link and K. Shapiro for their comments.

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Correspondence to Alfonso Caramazza.

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Miceli, G., Fouch, E., Capasso, R. et al. The dissociation of color from form and function knowledge. Nat Neurosci 4, 662–667 (2001) doi:10.1038/88497

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