HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) All Versions of this Article: 95/6/3770    most recent 00007.2006v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by de Hemptinne, C. Articles by Missal, M. Search for Related Content PubMed PubMed Citation Articles by de Hemptinne, C. Articles by Missal, M.

Influence of Cognitive Expectation on the Initiation of Anticipatory and Visual Pursuit Eye Movements in the Rhesus Monkey

¹Laboratoire de Neurophysiologie and ²Center for Systems Engineering and Applied Mechanics, Université catholique de Louvain, Brussels, Belgium

Submitted 4 January 2006; accepted in final form 7 March 2006

A classic paradigm to study anticipatory pursuit consists in training monkeys to look at a target that appears in the center of a visual display, disappears during a short "gap" period, then reappears and immediately starts to move. To determine the role of prior directional information on anticipatory pursuit eye movements, we trained rhesus monkeys to associate the color of a centrally presented visual cue with the direction of an upcoming target motion. In a first experiment, a gap period occurred randomly in 50% of the trials. Consequently, two possible choices of timing of target motion onset were given to subjects to guide their anticipatory responses. In a second experiment, a gap period occurred during each trial and only a single choice of timing of target motion onset was given to subjects. We found that monkeys used the learned association between the color of the cue and the direction of future target motion to voluntarily initiate anticipatory pursuit movements in the appropriate direction. Anticipatory movements could be classified in two distinct populations: early and late movements. Early movements were most frequent when prior directional information was provided and when two choices of timing of target motion onset were given. The latency of visual pursuit was shortened and its velocity was larger when prior directional information was provided. We conclude that cognitive expectation of future target motion plays a dominant role in determining characteristics of anticipatory pursuit in the monkey.

This article has been cited by other articles:

				C. de Hemptinne, P. Lefevre, and M. Missal Neuronal Bases of Directional Expectation and Anticipatory Pursuit J. Neurosci., April 23, 2008; 28(17): 4298 - 4310. [Abstract] [Full Text] [PDF]

				C. de Hemptinne, S. Nozaradan, Q. Duvivier, P. Lefevre, and M. Missal How Do Primates Anticipate Uncertain Future Events? J. Neurosci., April 18, 2007; 27(16): 4334 - 4341. [Abstract] [Full Text] [PDF]