Differential effects of viewpoint on object-driven activation in dorsal and ventral streams |
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Authors: | James Thomas W Humphrey G Keith Gati Joseph S Menon Ravi S Goodale Melvyn A |
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Affiliation: | CIHR Group on Action and Perception, Psychology Department, The University of Western Ontario, London, Ontario, Canada. |
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Abstract: | Using fMRI, we showed that an area in the ventral temporo-occipital cortex (area vTO), which is part of the human homolog of the ventral stream of visual processing, exhibited priming for both identical and depth-rotated images of objects. This pattern of activation in area vTO corresponded to performance in a behavioral matching task. An area in the caudal part of the intraparietal sulcus (area cIPS) also showed priming, but only with identical images of objects. This dorsal-stream area treated rotated images as new objects. The difference in the pattern of priming-related activation in the two areas may reflect the respective roles of the ventral and dorsal streams in object recognition and object-directed action. |
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