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) 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 Web of Science 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 Web of Science (3) Citing Articles via Google Scholar Google Scholar Articles by Vogelstein, J. T. Articles by Angelaki, D. E. Search for Related Content PubMed PubMed Citation Articles by Vogelstein, J. T. Articles by Angelaki, D. E.

Report

Accuracy of Saccades to Remembered Targets as a Function of Body Orientation in Space

Departments of ¹Neurobiology and ²Biomedical Engineering, Washington University School of Medicine, St. Louis, Missouri 63110

Submitted 14 February 2003; accepted in final form 19 March 2003

A vertical asymmetry in memory-guided saccadic eye movements has been previously demonstrated in humans and in rhesus monkeys. In the upright orientation, saccades generally land several degrees above the target. The origin of this asymmetry has remained unknown. In this study, we investigated whether the asymmetry in memory saccades is dependent on body orientation in space. Thus animals performed memory saccades in four different body orientations: upright, left-side-down (LSD), right-side-down (RSD), and supine. Data in all three rhesus monkeys confirm previous observations regarding a significant upward vertical asymmetry. Saccade errors made from LSD and RSD postures were partitioned into components made along the axis of gravity and along the vertical body axis. Up/down asymmetry persisted only in body coordinates but not in gravity coordinates. However, this asymmetry was generally reduced in tilted positions. Therefore the upward bias seen in memory saccades is egocentric although orientation in space might play a modulatory role.

This article has been cited by other articles:

				N. Li, M. Wei, and D. E. Angelaki Primate Memory Saccade Amplitude After Intervened Motion Depends on Target Distance J Neurophysiol, July 1, 2005; 94(1): 722 - 733. [Abstract] [Full Text] [PDF]