Tags

Type your tag names separated by a space and hit enter

The kinematics of far-near re-fixation saccades.
J Neurophysiol 2015; 113(9):3197-208JN

Abstract

We have analyzed the three-dimensional spatiotemporal characteristics of saccadic refixations between far and near targets in three behaviorally trained rhesus monkeys. The kinematics underlying these rapid eye movements can be accurately described by rotations of the eyes in four different planes, namely, first disconjugate rotations in the horizontal plane of regard converging the eyes toward the near target, followed by rotations in each eye's vertical direction plane, and finally, disconjugate rotations in a common frontoparallel plane. This compounded rotation of the eye was underlying an initially fast-rising variable torsion that typically overshot the final torsion, which the eyes attained at the time of target acquisition. The torsion consisted of a coarse, widely varying component of opposite polarity in the two eyes, which contained a more robust, much smaller modulation that sharply increased toward the end of saccades. The reorientation of the eyes in torsion depended on each eye's azimuth, elevation, and target distance. We conclude that refixation saccades are generated by motor commands that control ocular torsion in concert with the saccade generator, which operates in Donders-Listing kinematics underlying Listing's law.

Authors+Show Affiliations

Department of Neurology, University Hospital Zurich, Zurich, Switzerland bhess@neurol.uzh.ch.Department of Neurology, University Hospital Zurich, Zurich, Switzerland.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25717167

Citation

Hess, Bernhard J M., and H Misslisch. "The Kinematics of Far-near Re-fixation Saccades." Journal of Neurophysiology, vol. 113, no. 9, 2015, pp. 3197-208.
Hess BJ, Misslisch H. The kinematics of far-near re-fixation saccades. J Neurophysiol. 2015;113(9):3197-208.
Hess, B. J., & Misslisch, H. (2015). The kinematics of far-near re-fixation saccades. Journal of Neurophysiology, 113(9), pp. 3197-208. doi:10.1152/jn.00957.2014.
Hess BJ, Misslisch H. The Kinematics of Far-near Re-fixation Saccades. J Neurophysiol. 2015 May 1;113(9):3197-208. PubMed PMID: 25717167.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The kinematics of far-near re-fixation saccades. AU - Hess,Bernhard J M, AU - Misslisch,H, Y1 - 2015/02/25/ PY - 2014/12/01/received PY - 2015/02/24/accepted PY - 2015/2/27/entrez PY - 2015/2/27/pubmed PY - 2016/3/8/medline KW - Donders' law KW - Listing's law KW - disconjugate saccades KW - eye movements KW - stereoscopic vision SP - 3197 EP - 208 JF - Journal of neurophysiology JO - J. Neurophysiol. VL - 113 IS - 9 N2 - We have analyzed the three-dimensional spatiotemporal characteristics of saccadic refixations between far and near targets in three behaviorally trained rhesus monkeys. The kinematics underlying these rapid eye movements can be accurately described by rotations of the eyes in four different planes, namely, first disconjugate rotations in the horizontal plane of regard converging the eyes toward the near target, followed by rotations in each eye's vertical direction plane, and finally, disconjugate rotations in a common frontoparallel plane. This compounded rotation of the eye was underlying an initially fast-rising variable torsion that typically overshot the final torsion, which the eyes attained at the time of target acquisition. The torsion consisted of a coarse, widely varying component of opposite polarity in the two eyes, which contained a more robust, much smaller modulation that sharply increased toward the end of saccades. The reorientation of the eyes in torsion depended on each eye's azimuth, elevation, and target distance. We conclude that refixation saccades are generated by motor commands that control ocular torsion in concert with the saccade generator, which operates in Donders-Listing kinematics underlying Listing's law. SN - 1522-1598 UR - https://www.unboundmedicine.com/medline/citation/25717167/The_kinematics_of_far-near_re-fixation_saccades L2 - http://www.physiology.org/doi/full/10.1152/jn.00957.2014?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -