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The Head-Neck Sensory Motor System$
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Alain Berthoz, Werner Graf, and P. P. Vidal

Print publication date: 1992

Print ISBN-13: 9780195068207

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195068207.001.0001

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Gaze Saccades to Visual Targets: Does Head Movement Change the Metrics?

Gaze Saccades to Visual Targets: Does Head Movement Change the Metrics?

Chapter:
(p.427) Chapter 66 Gaze Saccades to Visual Targets: Does Head Movement Change the Metrics?
Source:
The Head-Neck Sensory Motor System
Author(s):

Wolfgang Becker

Reinhard Jürgens

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0066

In this chapter, the authors addressed the question of the degree to which gaze saccades executed under natural conditions are modulated by concomitant head movements by creating a “quasi-natural” situation. Head-fixed saccades were compared to head-free saccades. The first experiment in this study cannot prove or disprove the validity of Bizzi's classical summation hypothesis for human gaze saccades confined to the oculomotor range. It rather demonstrates that the presence of a classical VOR is irrelevant for the velocity of such gaze saccades since the concurrent head movement starts too late and is too slow to impart to the saccade a significant gain in velocity in the event of a disconnected VOR. The second experiment confirms that the factor of greater importance for the dynamics of head-free saccades is the orbital eccentricity and direction of the EiH contribution to saccades.

Keywords:   Bizzi, oculomotor range, gaze saccades, head movement, velocity, orbital eccentricity, classical summation hypothesis

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