Goal-oriented human saccades were
recorded under double-step paradigm. The stimuli consisted of either visual or
auditory-visual bi-sensory targets. Eye movement data were analyzed based on a
3rd-order linear horizontal saccadic eye movement model, where the inputs to
the muscle were agonist and antagonist active-state tensions that were
described by pulse-slide-step waveforms with a post inhibitory rebound burst
(PIRB) based on a timeoptimal controller.
Parameter estimations were calculated
using the system identification technique for saccade parameters and neural
inputs. Saccade amplitude transition function (ATF) and response latency
indicated the saccade programming mechanism.
The responses were affected by
when the second peripheral target was presented. The neural input estimations
supported the responsive neuron populations in the superior colliculus under
different stimulus conditions, and indicated the double-step visual or
auditory-visual stimulus may affect the synchrony of neuron firing. The study
described here expanded our previous work and further supported the muscle
model as well as the theory of the time-optimal saccade controller under physiological
constraints.Read More...
No comments:
Post a Comment