Saccade neurons in the frontal eye fields (FEF) are thought to signal both rapid eye movement commands and rapid head movement commands for head-free gaze shifts (Tu and Keating 2000; Knight and Fuchs 2006; however, Chen 2006).
All other aspects of this task were the same as the free-gaze condition.
However, FEF pursuit neurons have never been tested during head-free gaze-pursuit.
Detailed information about FEF pursuit signals is necessary to elucidate their role in head-free, gaze-pursuit.
The question we address in the present study is whether FEF pursuit neurons carry gaze-pursuit commands that drive both eye-pursuit and head-pursuit during head-free gaze-pursuit.
To allow the monkeys to make head-free, gaze-pursuit, the head holders were fixed to a mechanical device similar to the one used by Belton and McCrea (1999, 2000b).
"The free Tobii Gaze Interaction software development kit is available to companies interested in exploring the possibilities of gaze interaction and using this revolutionary technology to develop gaze applications that will take part in the future of computing and consumer electronics," said Tobii's chief executive Henrik Eskilsson.
After all, we live not in but on a world, one so achingly beautiful that we can hardly imagine we are free to gaze or sit down upon it anytime we like.
Zeus places his lyre among the stars, and Orpheus returns to the underworld for a second time, where he wanders the happy fields with Eurydice for all eternity, free to gaze on her as often as he likes.
Which, I understand, isn't that many times, but my point is that the possibility is always there for me, as a result of my eyes being free to gaze at whatever, whenever.
