Accuracy of saccades to remembered targets as a function of body orientation in space

Joshua T. Vogelstein, Lawrence H. Snyder, Dora E. Angelaki

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)521-524
Number of pages4
JournalJournal of neurophysiology
Issue number1
StatePublished - Jul 1 2003

ASJC Scopus subject areas

  • General Neuroscience
  • Physiology


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