Separate body- and world-referenced representations of visual space in parietal cortex

Lawrence H. Snyder, Kenneth L. Grieve, Peter Brotchie, Richard A. Andersen

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In order to direct a movement towards a visual stimulus, visual spatial information must be combined with postural information. For example, directing gaze (eye plus head) towards a visible target requires the combination of retinal image location with eye and head position to determine the location of the target relative to the body. Similarly, world-referenced postural information is required to determine where something lies in the world. Posterior parietal neurons recorded in monkeys combine visual information with eye and head position. A population of such cells could make up a distributed representation of target location in an extraretinal frame of reference. However, previous studies have not distinguished between world- referenced and body-referenced signals. Here we report that modulations of visual signals (gain fields) in two adjacent cortical fields, LIP and 7a, are referenced to the body and to the world, respectively. This segregation of spatial information is consistent with a streaming of information, with one path carrying body-referenced information for the control of gaze, and the other tasks that require an absolute frame of reference.
    Original languageEnglish
    Pages (from-to)887-891
    Number of pages4
    JournalNature
    Volume394
    Issue number6696
    DOIs
    Publication statusPublished - 27 Aug 1998

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