Model-based analysis of dynamics in vergence adaptation.
We previously proposed a model to study the dynamics of disparity vergence responses. This model was based on known physiology and consisted of pulse and step neural control processes feeding a linear second-order oculomotor plant. Here, we apply a slightly modified version of that model to analyze the influence of short-term adaptation on vergence dynamics. This analysis showed that, unlike normal vergence responses, adapted responses could not be accurately simulated without a delay between the step and pulse components. Through simulations of normal vergence and adapted vergence responses, we found a strong correlation between delay of the step signal and the size of the movement overshoot. This correlation suggests a strong interaction between neural process generating the pulse and step motor control signals.
Yuan
W
W
Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855-0909, USA.
Semmlow
J L
JL
Muller-Munoz
P
P
D000222:Adaptation, Physiological; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D012016:Reference Values; D012438:Saccades / Q000502:physiology; D015357:Vision Disparity / Q000502:physiology*