Object shape processing in the visual system evaluated using functional MRI.

Published

Journal Article

We used functional MRI (fMRI) to determine the cortical regions activated during processing of visual object shape in humans in six men and three women, using a paradigm with a baseline condition of simple shape detection and an activated condition of object/nonobject shape discrimination. Eight of the nine subjects studied showed significant signal changes. Seven of eight showed changes in the occipital lobes (five bilateral, two right only, one left only). All eight subjects with signal changes exhibited changes in the parietal lobes bilaterally. In the occipitotemporal gyri, there were signal changes bilaterally in seven subjects and unilaterally, on the right, in one. Activation-related fMRI signal increases were also present in the posterior superior and middle temporal gyri in seven of the subjects, with four showing bilateral signal changes, two showing signal changes on the left only, and one only on the right. The data strongly suggest that processing of object shape information in humans activates both the ventral and dorsal visual processing pathways ("what" and "where" pathways), described previously both in humans and in nonhuman primates.

Full Text

Duke Authors

Cited Authors

  • Kraut, M; Hart, J; Soher, BJ; Gordon, B

Published Date

  • May 1997

Published In

Volume / Issue

  • 48 / 5

Start / End Page

  • 1416 - 1420

PubMed ID

  • 9153483

Pubmed Central ID

  • 9153483

International Standard Serial Number (ISSN)

  • 0028-3878

Digital Object Identifier (DOI)

  • 10.1212/wnl.48.5.1416

Language

  • eng

Conference Location

  • United States