Evidence for wide range of time scales in oculomotor plant dynamics: implications for models of eye-movement control.
Oculomotor-plant dynamics are not well characterised, despite their importance for modelling eye-movement control. We analysed the time course of the globe's return after horizontal displacements in three rhesus monkeys lightly anaesthetised with ketamine. The eye-position traces were well fitted by a sum of four exponentials (time constants 0.012, 0.099, 0.46, 7.8 s). The two long time-constant terms accounted for 25% of plant compliance, and led to a model that accounted for hitherto unexplained features of ocular motoneuron firing such as (i) hysteresis, and (ii) the inability of a 2 time-constant model to fit data for both fast and slow eye-movements.
Sklavos
Sokratis
S
Medical School, University of Patras, 26500 Patras, Greece.
Porrill
John
J
Kaneko
Chris R S
CR
Dean
Paul
P
D000222:Adaptation, Physiological / Q000502:physiology; D000818:Animals; D002531:Cerebellum / Q000502:physiology; D005133:Eye Movements / Q000502:physiology*; D005152:Facial Muscles / Q000502:physiology*; D008253:Macaca mulatta; D023421:Models, Animal; D009046:Motor Neurons / Q000502:physiology; D025341:Principal Component Analysis / Q000379:methods; D013997:Time Factors