A long time ago there was a discussion on this net about feedback and
eyemovements but it was before I was into this topic so I don't recall the
conclusions. A number of people here have been discussing it and have
concluded that there is no visual feedback during saccadic movement. They
agree that it works by setting an end point, not by simply producing an
output, but there is no evidence for Visual feedback, only oculomotor
feedback. The evidence for oculomotor feedback is that the shape of the
nonhorizontal saccades is odd--it sort of loops from its origin and makes
a long movement towards the middle of the path where it goes horizontalish
and then move the rest of the other half and sort of loops around the end
point. Its sort of symmetrical across the x and y axis (not just x or
just y, though). Its difficult to describe--you might say that its like
attatching to very stretched out S's together so that the top of one is
the bottom of the other. Any models out there to account for this
peculiar finding?
Please let me know if you know of any visual feedback evidence.
Please send replies to my address
Mark Olson
Neuroscience Program
University of Illinois
m-olson@uiuc.edu