Superior Colliculus
Using electrical microstimulation, we have shown that the SC evokes head-free gaze shifts with normal patterns of 3-D eye-head coordination, i.e., the default circuits for Listing's law and Donders' law are downstream from the SC. We have also analyzed the frames of reference for the evoked gaze shifts and found that they encode fixed gaze shifts in eye coordinates, rather than 'fixed vector' movements or spatial goals. Thus, the transformation from eye coordinates to body coordinates also occurs downstream from the SC. Finally, we have stimulated the SC following adaptation of eye-head coordination strategies to show which of these adaptations are implemented downstream from the SC and which are implemented in a parallel cortical-brainstem circuit. Currently we are using single unit recordings to confirm and extend these results.CONSTANTIN
AG, WANG H,
CRAWFORD JD
(2004)
Role of superior colliculus in adaptive eye-head coordination during
gaze shifts.
Journal of
Neurophysiology 92: 2168-2184
MARTINEZ-TRUJILLO
JC, KLIER EM, WANG H, CRAWFORD JD (2003)
Contribution of head movement to gaze command coding in monkey frontal
cortex and superior colliculus
Journal
of Neurophysiology 90: 2770-2776
KLIER E, WANG H, CRAWFORD JD (2003)
Three-dimensional eye-head coordination is implemented downstream from
the superior colliculus
Journal
of Neurophysiology 89(5): 2839-2853
KLIER E, WANG H, CRAWFORD JD (2001)
The superior colliculus codes gaze commands in retinal coordinates
Nature
Neuroscience 4:
627-632
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