Seminar Details
2009-09-29 (14.00) : New model of gaze tracking in 2D: Novel architecture with independent gaze and head controllers
At Euler building
Organized by Mathematical Engineering
Speaker :
Daye, Pierre
Abstract :
Reorienting our gaze recruits both eye and head movements to achieve a
common goal. During a gaze movement, the head may also be voluntarily
moved for some other purpose, e.g., to align the mouth with food.
Currently, two mechanisms are proposed to explain the coordination of
eye and head movements. In the first, a central gaze controller
pre-computes a desired eye and head displacement to execute a gaze
movement. This model can generate independent movements for the head and
gaze but, because of its structure, it can not compensate for
perturbations of the head during the gaze change. In the second, a gaze
controller sends the same command to the eye and the head, and a gaze
feedback loop compensates for any errors or perturbations during the
gaze change. However, this model can not generate independent movements
of the head. We propose a novel approach for coordinated eye and head
control in which there are separate controllers, for gaze and head,
rather than for gaze alone or for eye and head. In this model, the gaze
controller drives both the eye and the head. Gaze feedback through the
cerebellum compensates for perturbations by acting only on the eye.
Thus, in this model the eye only serves gaze, and can not be directed to
an arbitrary goal.