Title :
The pupil as a possible monitor of the autonomic nervous system
Author :
Yamaji, Kazutsuna ; Hirata, Yutaka ; Usui, Shiro
Author_Institution :
Toyohashi Univ. of Technol., Japan
fDate :
30 Oct-2 Nov 1997
Abstract :
The pupil is innervated by the autonomic nervous activity. With the easiness of observation, it has been utilized as a possible monitor of the autonomic nervous system activity. In this paper, two possible methods for evaluating the sympathetic and the parasympathetic nervous activity are proposed. One of them is an improved version of the conventional method which has been developed and used by neuro-ophthalmologists to diagnose the autonomic nervous diseases. The other one employs the inverse dynamic model of the pupil muscle system. Validity of each method is confirmed by the drug experiment or comparison with directly measured autonomic nervous system activity to the pupil. Finally, the result of an application of the new method is described
Keywords :
aerospace biophysics; biocontrol; biomechanics; eye; inverse problems; muscle; neurophysiology; physiological models; autonomic nervous diseases; autonomic nervous system; biological control system; biomechanical model; drug experiment; gravitational change effect; inverse dynamic model; iris muscle model; nervous system activity monitor; parabolic experiment; parasympathetic nervous activity; pupil diameter changes; pupil muscle system; space medicine; sympathetic nervous activity; Autonomic nervous system; Biological system modeling; Biomedical monitoring; Drugs; Inverse problems; Medical diagnostic imaging; Muscles; Nervous system; Parkinson´s disease; Space technology;
Conference_Titel :
Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-4262-3
DOI :
10.1109/IEMBS.1997.756905
