ISSN:
1432-1106
Keywords:
Eye
;
Head
;
Arm
;
Coordination
;
Gaze
;
Rotatory synergy
;
Reaching
;
Human
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary We have recorded eye, head, and upper arm rotations in five healthy human subjects using the three-dimensional search coil technique. Our measurements show that the coordination of eye and head movements during gaze shifts within ± 25 deg relative to the forward direction is organized by restricting the rotatory trajectories of the two systems to almost parallel planes. These so-called “Listing planes” for eye-in-space and head-in-space rotations are workspace-oriented, not body-fixed. Eye and head trajectories in their respective planes are closely related in direction and amplitude. For pointing or grasping, the rotatory trajectories of the arm are also restricted to a workspace-oriented Listing plane. During visually guided movements, arm follows gaze, and the nine-dimensional rotatory configuration space for eye-head-arm-synergies (three degrees of freedom for each system) is reduced to a two-dimensional plane in the space of quaternion vectors.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00231055
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