Evidence for on-line visual guidance during saccadic gaze shifts.

M.A. Grealy, Cathy Craig, D.N. Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Rapid orientating movements of the eyes are believed to be controlled ballistically. The mechanism underlying this control is thought to involve a comparison between the desired displacement of the eye and an estimate of its actual position (obtained from the integration of the eye velocity signal). This study shows, however, that under certain circumstances fast gaze movements may be controlled quite differently and may involve mechanisms which use visual information to guide movements prospectively. Subjects were required to make large gaze shifts in yaw towards a target whose location and motion were unknown prior to movement onset. Six of those tested demonstrated remarkable accuracy when making gaze shifts towards a target that appeared during their ongoing movement. In fact their level of accuracy was not significantly different from that shown when they performed a 'remembered' gaze shift to a known stationary target (F-3,F-15 = 0.15, p > 0.05). The lack of a stereotypical relationship between the skew of the gaze velocity profile and movement duration indicates that on-line modifications were being made. It is suggested that a fast route from the retina to the superior colliculus could account for this behaviour and that models of oculomotor control need to be updated.
LanguageEnglish
Pages1799-1804
Number of pages6
JournalProceedings of the Royal Society of London. Series B, Biological Sciences
Volume266
Issue number1430
Publication statusPublished - 1 Sep 1999

Fingerprint

Yaws
Superior Colliculi
REM Sleep
Retina

Cite this

@article{c7e8455a09bf44bea125810fe281d34a,
title = "Evidence for on-line visual guidance during saccadic gaze shifts.",
abstract = "Rapid orientating movements of the eyes are believed to be controlled ballistically. The mechanism underlying this control is thought to involve a comparison between the desired displacement of the eye and an estimate of its actual position (obtained from the integration of the eye velocity signal). This study shows, however, that under certain circumstances fast gaze movements may be controlled quite differently and may involve mechanisms which use visual information to guide movements prospectively. Subjects were required to make large gaze shifts in yaw towards a target whose location and motion were unknown prior to movement onset. Six of those tested demonstrated remarkable accuracy when making gaze shifts towards a target that appeared during their ongoing movement. In fact their level of accuracy was not significantly different from that shown when they performed a 'remembered' gaze shift to a known stationary target (F-3,F-15 = 0.15, p > 0.05). The lack of a stereotypical relationship between the skew of the gaze velocity profile and movement duration indicates that on-line modifications were being made. It is suggested that a fast route from the retina to the superior colliculus could account for this behaviour and that models of oculomotor control need to be updated.",
author = "M.A. Grealy and Cathy Craig and D.N. Lee",
year = "1999",
month = "9",
day = "1",
language = "English",
volume = "266",
pages = "1799--1804",
journal = "Proceedings of the Royal Society of London. Series B, Biological Sciences",
issn = "0962-8452",
number = "1430",

}

Evidence for on-line visual guidance during saccadic gaze shifts. / Grealy, M.A.; Craig, Cathy; Lee, D.N.

In: Proceedings of the Royal Society of London. Series B, Biological Sciences, Vol. 266, No. 1430, 01.09.1999, p. 1799-1804.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Evidence for on-line visual guidance during saccadic gaze shifts.

AU - Grealy, M.A.

AU - Craig, Cathy

AU - Lee, D.N.

PY - 1999/9/1

Y1 - 1999/9/1

N2 - Rapid orientating movements of the eyes are believed to be controlled ballistically. The mechanism underlying this control is thought to involve a comparison between the desired displacement of the eye and an estimate of its actual position (obtained from the integration of the eye velocity signal). This study shows, however, that under certain circumstances fast gaze movements may be controlled quite differently and may involve mechanisms which use visual information to guide movements prospectively. Subjects were required to make large gaze shifts in yaw towards a target whose location and motion were unknown prior to movement onset. Six of those tested demonstrated remarkable accuracy when making gaze shifts towards a target that appeared during their ongoing movement. In fact their level of accuracy was not significantly different from that shown when they performed a 'remembered' gaze shift to a known stationary target (F-3,F-15 = 0.15, p > 0.05). The lack of a stereotypical relationship between the skew of the gaze velocity profile and movement duration indicates that on-line modifications were being made. It is suggested that a fast route from the retina to the superior colliculus could account for this behaviour and that models of oculomotor control need to be updated.

AB - Rapid orientating movements of the eyes are believed to be controlled ballistically. The mechanism underlying this control is thought to involve a comparison between the desired displacement of the eye and an estimate of its actual position (obtained from the integration of the eye velocity signal). This study shows, however, that under certain circumstances fast gaze movements may be controlled quite differently and may involve mechanisms which use visual information to guide movements prospectively. Subjects were required to make large gaze shifts in yaw towards a target whose location and motion were unknown prior to movement onset. Six of those tested demonstrated remarkable accuracy when making gaze shifts towards a target that appeared during their ongoing movement. In fact their level of accuracy was not significantly different from that shown when they performed a 'remembered' gaze shift to a known stationary target (F-3,F-15 = 0.15, p > 0.05). The lack of a stereotypical relationship between the skew of the gaze velocity profile and movement duration indicates that on-line modifications were being made. It is suggested that a fast route from the retina to the superior colliculus could account for this behaviour and that models of oculomotor control need to be updated.

M3 - Article

VL - 266

SP - 1799

EP - 1804

JO - Proceedings of the Royal Society of London. Series B, Biological Sciences

T2 - Proceedings of the Royal Society of London. Series B, Biological Sciences

JF - Proceedings of the Royal Society of London. Series B, Biological Sciences

SN - 0962-8452

IS - 1430

ER -