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2 - The internal eye position signal, psychophysics, and neurobiology

from Part I - Time–space during action: perisaccadic mislocalization and reaching

Published online by Cambridge University Press:  05 October 2010

By
John Schlag  and
Madeleine Schlag-Rey
Edited by
Romi Nijhawan  and
Beena Khurana
Romi Nijhawan
Affiliation:
University of Sussex
Beena Khurana
Affiliation:
University of Sussex
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Summary

Summary

“Real-time sensorimotor control requires the sampling and manipulation not only of parameters representing space but also of those representing time. In particular, when the system itself has inherent processing delays, it invites a situation in which sampled parameters from a peripheral sensor may no longer be valid at the time they are to be used, due to the change in state that took place during the processing delay” (Dominey et al. 1997). In this chapter, we focus on the situation in which a visual stimulus is flashed near the time of a saccade, and the subject's task is to orient the eyes toward the site where the stimulus has been. To perform this task in complete darkness, the subject's brain has to rely on only two signals: retinal error signal and internal eye position signal (iEPS). This is one of the most interesting situations in which the brain has to compute something in the face of specific physical odds (e.g., very long latencies), and we have some hints on how it proceeds. We analyze the time course of the iEPS – which appears quite distorted – using electrical stimulation of brain structures, instead of natural visual stimuli, to provide the goal to be localized. Different hypotheses are then discussed regarding the possible source and possible neural correlate of the iEPS.

Although vision is usually thought of as a continuous process – continuous in space and time – it is periodically interrupted by rapid eye movements called saccades.

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Space and Time in Perception and Action , pp. 9 - 18
Publisher: Cambridge University Press
Print publication year: 2010

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