Disparity vergence double responses processed by internal error.
Disparity vergence eye movements occasionally exhibit two high-velocity components to a single step stimulus (Alvarez, T. L., Semmlow, J. L. & Yuan, W. (1998). Journal of Neurophysiology, 79, 37-44). This research investigates the neural strategy used to trigger the second component of double high-velocity vergence eye movements. Vergence doubles evoked by an experimental protocol that induces post-movement visual error were compared to doubles that occur normally. The second component of a visually evoked response double occurred later, and with slower dynamics, than that of a naturally occurring double. These differences in timing and dynamics indicate that natural double responses are mediated, at least in part, by a mechanism other than visual feedback. The faster dynamics and timing of natural doubles suggest that an internal monitoring process triggers these movements.
Alvarez
T L
TL
Department of Biomedical Engineering, Rutgers, State University, Piscataway, NJ 08855, USA. semmlow@biomed.rutgers.edu
Semmlow
J L
JL
Yuan
W
W
Munoz
P
P
D000293:Adolescent; D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005074:Evoked Potentials, Visual / Q000502:physiology; D005133:Eye Movements / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D015357:Vision Disparity / Q000502:physiology*