P 459 Neuronal circuity involved during blink reflex: A double retrograde tracing and neurophysiological study in the primate

Pumose. The influence of the widely used test of human autonomic functions the Valsalva maneuver (VhQ, on the parameters of a pupillaq light reflex, were stodied in nine normal volunteers (mean age 21 .O years) Methods. The consensual pupillary reactions to light were recorded by infrared-reflecting pupillograph, the pupillogram (PC) records on the type were treated off-line by computerized system. Results. It was demonstrated that the PG-latent time increased during beginning of the VM and normalized m the first min. after its end. Inversaly, the PG-constriction time decreased do riig the VM and normalized not before the sixst min. of its end. Similar dynamics maniffested the PG-halfredilatation-time. Some systematic and significant changes in PG-amplitude could not be demonstrated Conclusion Possible interactions between the observed changes of some PG-parameters during and after VM and the prevailed parasympathetic or sympathetic activity during some phrws of the VM and after its end, have been discussed.