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J Neurophysiol 82: 343-358, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 82 No. 1 July 1999, pp. 343-358
Copyright ©1999 by the American Physiological Society

Responses to Auditory Stimuli in Macaque Lateral Intraparietal Area II. Behavioral Modulation

Jennifer F. Linden,2 Alexander Grunewald,1 and Richard A. Andersen1,2

 1Division of Biology and  2Computation and Neural Systems Program, California Institute of Technology, Pasadena, California 91125

Linden, Jennifer F., Alexander Grunewald, and Richard A. Andersen. Responses to Auditory Stimuli in Macaque Lateral Intraparietal Area II. Behavioral Modulation. J. Neurophysiol. 82: 343-358, 1999.The lateral intraparietal area (LIP), a region of posterior parietal cortex, was once thought to be unresponsive to auditory stimulation. However, recent reports have indicated that neurons in area LIP respond to auditory stimuli during an auditory-saccade task. To what extent are auditory responses in area LIP dependent on the performance of an auditory-saccade task? To address this question, recordings were made from 160 LIP neurons in two monkeys while the animals performed auditory and visual memory-saccade and fixation tasks. Responses to auditory stimuli were significantly stronger during the memory-saccade task than during the fixation task, whereas responses to visual stimuli were not. Moreover, neurons responsive to auditory stimuli tended also to be visually responsive and to exhibit delay or saccade activity in the memory-saccade task. These results indicate that, in general, auditory responses in area LIP are modulated by behavioral context, are associated with visual responses, and are predictive of delay or saccade activity. Responses to auditory stimuli in area LIP may therefore be best interpreted as supramodal responses, and similar in nature to the delay activity, rather than as modality-specific sensory responses. The apparent link between auditory activity and oculomotor behavior suggests that the behavioral modulation of responses to auditory stimuli in area LIP reflects the selection of auditory stimuli as targets for eye movements.




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