Optical imaging of visually evoked responses in prosimian primates reveals conserved features of the middle temporal visual area

Xiangmin Xu, Christine E. Collins, Peter M. Kaskan, Ilya Khaytin, Jon H. Kaas, Vivien A. Casagrande*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Optical imaging of intrinsic cortical responses to visual stimuli was used to characterize the organization of the middle temporal visual area (MT) of a prosimian primate, the bush baby (Otolemur garnetti). Stimulation with moving gratings revealed a patchwork of oval-like domains in MT. These orientation domains could, in turn, be subdivided into zones selective to directional movements that were mainly orthogonal to the preferred orientation. Similar, but not identical, zones were activated by movements of random dots in the preferred direction. Orientation domains shifted in preference systematically either around a center to form pinwheels or as gradual linear shifts. Stimuli presented in different portions of the visual field demonstrated a global representation of visual space in MT. As optical imaging has revealed similar features in MT of New World monkeys, MT appears to have retained these basic features of organization for at least the 60 million years since the divergence of prosimian and simian primates.

Original languageEnglish (US)
Pages (from-to)2566-2571
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume101
Issue number8
DOIs
StatePublished - Feb 22 2004

ASJC Scopus subject areas

  • General

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