Grealy, M A and Craig, C M and Lee, D N (1999) Evidence for on-line visual guidance during saccadic gaze shifts. Proceedings B: Biological Sciences, 266 (1430). pp. 1799-1804.Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|Keywords:||prospective control, gaze shifting, oculomotor control, models, on-line visual guidance, eye-head coordination, superior colliculus, layer, movements, suppression, fixation, monkey, system , Psychology|
|Subjects:||Philosophy. Psychology. Religion > Psychology|
|Department:||Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Psychology|
|Depositing user:||Pure Administrator|
|Date Deposited:||04 Apr 2011 09:21|
|Last modified:||04 May 2016 17:48|