FIGURE 23.1. Representation of visual stimuli in hand-based coordinates.

FIGURE 23.1

Representation of visual stimuli in hand-based coordinates. Visual responses of a typical premotor neuron with a tactile RF (hatched) on forearm and hand, and a visual RF within 10 cm of tactile RF. On each trial, the arm contralateral to neuron was fixed in one of two positions: (a) on the right (light gray symbols and lines) or (b) on the left (dark gray symbols and lines) and visual stimulus was advanced along one of four trajectories (numbered 1–4). (c) Responses of neuron to four stimulus trajectories when the arm was visible to the monkey were recorded for both positions. When the arm was fixed on the right, response was maximal for trajectory 3, which was approaching the neuron's tactile RF. When the arm was fixed on the left, maximal response shifted with the hand to trajectory 2, which was now approaching the tactile RF. This example shows that neurons in the monkey's premotor cortex represent visual information with respect to the tactile RF. (Modified from Graziano, M. S. A. In Proceedings of the National Academy of Sciences of the United States of America, 1999.)

From: Chapter 23, Peripersonal Space

Cover of The Neural Bases of Multisensory Processes
The Neural Bases of Multisensory Processes.
Murray MM, Wallace MT, editors.
Boca Raton (FL): CRC Press/Taylor & Francis; 2012.
Copyright © 2012 by Taylor & Francis Group, LLC.

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