Proceedings of Annual Meeting of the Physiological Society of Japan
Proceedings of Annual Meeting of the Physiological Society of Japan
Session ID : 3S-40F4
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Orientation map reorganization induced by persistent exposure to a dynamic or stationary single orientation
*Shigeru TanakaToshiki TaniJérôme Ribot
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Abstract
To examine the plastic changes in orientation selectivity of developing visual cortex, we manipulated visual experience of kittens for 1-7 weeks under a freely moving condition, mounting cylindrical-lens-fitted goggles to present uni-axially elongated images of their environments, or spherical-lens-fitted goggles to present a stationary black-and-white oriented grating. We performed intrinsic signal optical imaging from those animals to reconstruct cortical representation of orientation preferences. For exposure to either a dynamic or stationary single orientation through the goggles, the extreme over-representation of exposed orientation was found in the visual cortex immediately after 1-2 weeks of continuous goggle rearing. For kittens exposed to a dynamic single orientation for a longer time, reorganized orientation maps were preserved although the degree of over-representation was somehow reduced. However, for kittens persistently exposed to a stationary oriented grating for long time, the over-representation effect almost disappeared or in some cases the orientation maps paradoxically exhibited the over-representation of the orientation orthogonal to the exposed orientation. It is suggested that the consolidation of reorganized orientation maps requires the experience of moving visual stimuli with behavioral relevance. [J Physiol Sci. 2006;56 Suppl:S60]
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© 2006 The Physiological Society of Japan
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