Accession Number : ADP001617

Title :   A Nonlinear Internal Feedback Model for the Pupil Control System,

Corporate Author : CALIFORNIA UNIV BERKELEY

Personal Author(s) : Sun,Fuchuan ; Krenz,William C. ; Stark,Lawrence W.

Report Date : JAN 1983

Pagination or Media Count : 16

Abstract : The human pupillary control system is a typical biological control system and exhibits a series of interesting nonlinear behaviors, particularly asymmetry, pupillary escape, and pupillary capture. A fairly simple nonlinear model is presented in which a signal statically proportional to pupil size is fed back internally to cause a change in system parameters related to gains and rates of light adaptation. The model was simulated on a digital computer, improvements over previous pupil models demonstrated, and a variety of experimental data as well matched. Candidate physiological mechanisms for the components of the model are discussed.

Descriptors :   *Adaptation(Physiology), *Eye, Biofeedback, Internal, Rates, Light, Intensity, Digital simulation, Performance(Human), Response(Biology), Asymmetry, Nonlinear systems, Mathematical models, Iris, Sizes(Dimensions), Reflexes

Distribution Statement : APPROVED FOR PUBLIC RELEASE