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Optokinetic Functions and Optokinetic after-Nystagmus-Producing Mechanism in the Monkey

Authors :
Takahashi, Masahiro
Uemura, Takuya
Tanaka, Eiichi
Inoue, Tetsuzo
Source :
Acta Oto-Laryngologica; 1983, Vol. 95 Issue: 0 p40-48, 9p
Publication Year :
1983

Abstract

Optokinetic nystagmus (OKN) and after-nystagmus (OKAN) were investigated in monkeys subjected to conventional and reversed optokinetic stimulation. The decreasing patterns of OKAN slow phase speed (SPS) changed from a straight to a catenary-like pattern with increased stimulus speed. The total duration, however, of the first and second phases remained unchanged. Immediately after a sudden reversal of the stimulus direction, neither OKAN nor OKN was induced; the slow rising portion of OKN SPS became 1.2-1.6 times longer than that of the usual OKN. Since OKN inhibition after stimulation reversal shared similar characteristics with the slow rise of OKN SPS in the light and with the decrease of OKAN SPS in the dark, all of these can be regarded as adaptive processes of the after-nystagmus-producing mechanism.

Details

Language :
English
ISSN :
00016489 and 16512251
Volume :
95
Issue :
0
Database :
Supplemental Index
Journal :
Acta Oto-Laryngologica
Publication Type :
Periodical
Accession number :
ejs13520397
Full Text :
https://doi.org/10.3109/00016488309129576