Relationship between Ciliary Perfusion Pressure and Pattern-Reversal Visual Evoked Cortical Potentials: An Electro-Encephalo-Dynamographic Investigation

1986 ◽  
Vol 18 (5) ◽  
pp. 260-264 ◽  
Author(s):  
Wulff-D. Ulrich ◽  
C. Ulrich ◽  
B.-D. Bohne ◽  
C. Niederländer
Keyword(s):  
Perfusion Pressure ◽  
Pattern Reversal ◽  
Evoked Cortical Potentials ◽  
Visual Evoked ◽  
Cortical Potentials

Functional Activity of the Retina and Visual Evoked Cortical Potentials in Simulation the Factors of Space Flight in Conditions of Four Month Isolation in a Hermetic Object with Artificial Habitat

2021 ◽  
Vol 76 (5) ◽  
pp. 488-496
Author(s):  
Vladimir V. Neroev ◽  
Marina V. Zueva ◽  
Irina V. Tsapenko ◽  
Yuri A. Bubeev ◽  
Olga M. Manko ◽  
...  
Keyword(s):  
Visual System ◽  
Functional Activity ◽  
Electrophysiological Study ◽  
Pattern Reversal ◽  
Confined Space ◽  
Prolonged Stay ◽  
Artificial Environment ◽  
Evoked Cortical Potentials ◽  
Visual Evoked ◽  
Cortical Potentials

Background. The artificial environment of confined space causes a decrease in the functional reserve of the central nervous system and can affect human health and the success of space missions. In solving this problem, the urgent task is to study adaptation mechanisms that adapt the functioning of the visual sensory system to the conditions of the extreme environment. Purpose to obtain new objective data on the alterations in the functional activity of the visual system during prolonged stay of a person in extreme environmental conditions. Methods. Before and after a 4-month isolation experiment simulating a flight to the moon, an electrophysiological study was conducted of six practically healthy crew members with registration of a set of electroretinograms (ERG) and pattern-reversal visual evoked cortical potentials (VEP) according to the ISCEV standards. In dynamics, corrected monocular visual acuity (MVA) was assessed on board. Results. After the end of the experiment, on average for the group, there were no statistically significant changes in the MVA and functional activity of the retina and visual cortex compared with the initial data. However, individual changes on the part of the flicker ERG and reduction of VEP to small patterns stimulating the parvocellular channel of the visual system were revealed in three testers. These changes were associated with higher visually intense work and physical activity of these crew members, and with an individual reaction to sleep deprivation of pilots with increased responsibility. Conclusion. Four-month isolation with imitation of a space mission did not cause significant changes in the functional activity of the retina and visual pathways in healthy crew members. Individual differences of VEP-responses of the parvocellular visual system were revealed, which can reflect a high level of psychophysiological adaptation and stress resistance in physically active crew members.

Visual evoked cortical potentials from transient dark and bright stimuli

1992 ◽  
Vol 80 (2) ◽  
pp. 171-181 ◽  
Author(s):  
Erkan Mutlukan ◽  
Michael Bradnam ◽  
David Keating ◽  
Bertil E. Damato
Keyword(s):  
Evoked Cortical Potentials ◽  
Visual Evoked ◽  
Cortical Potentials
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