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Summary: Models of the Posterior Parietal Cortex Which
Perform Multimodal Integration and
Represent Space in Several Coordinate Frames
Jing Xing and Richard A. Andersen
California Institute of Technology
Abstract
& Many neurons in the posterior-parietal cortex (PPC) have
saccadic responses to visual and auditory targets. The
responses are modulated by eye position and head position.
These findings suggest that PPC integrates multisensory inputs
and may provide information about saccadic targets repre-
sented in different coordinate frames. In addition to an eye-
centered output representation, PPC may also project to brain
areas which contain head-centered and body-centered repre-
sentations of the space. In this report, possible coordinate
transformations in PPC were examined by comparing several
sets of models of PPC, each having different representations in
the output layer: (i) an eye-centered map only; (ii) a head-
centered map only; (iii) an eye-centered map and a head-
centered map; and (iv) an eye-centered map, a head-centered
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