The effect of muscimol micro-injections into the fastigial nucleus on the optokinetic response and the vestibulo-ocular reflex in the alert monkey

1993 ◽  
Vol 94 (2) ◽  
Author(s):  
R. Kurzan ◽  
A. Straube ◽  
U. B�ttner
Keyword(s):  
Fastigial Nucleus ◽  
Optokinetic Response ◽  
Alert Monkey ◽  
Ocular Reflex ◽  
Vestibulo Ocular Reflex

Effect of Incisions in the Brainstem Commissural Network on the Short-Term Vestibulo-Ocular Adaptation of the CAT

1991 ◽  
Vol 1 (3) ◽  
pp. 223-239
Author(s):  
G. Cheron
Keyword(s):  
Low Frequency ◽  
Adaptive Plasticity ◽  
Training Procedure ◽  
Optokinetic Response ◽  
Mean Values ◽  
Ocular Reflex ◽  
Optokinetic Reflex ◽  
Before And After ◽  
Vestibulo Ocular Reflex ◽  
Vor Adaptation

This study was intended to test the adaptive plasticity of the vestibulo-ocular reflex before and after either a midsagittal or parasagittal incision in the brainstem. Eye movements were measured with the electromagnetic search coil technique during the vestibulo-ocular reflex (VORD) in the dark, the optokinetic reflex (OKN), and the visuo-vestibular adaptive training procedure. Two types of visual-vestibular combined stimulation were applied by means of low frequency stimuli (0.05 to 0.10 Hz). In order to increase or decrease the VORD gain, the optokinetic drum was oscillated either 180∘ out-of-phase or in-phase with the vestibular stimulus turntable. This “training” procedure was applied for 4 hours. Initial measurements of the VORD were normal with a mean gain value of 0.92 ± 0.08. After 4 hours of “training” with the out-of-phase condition (180∘), VORD gain reached mean values of 1.33 ± 0.11 (n = 6 cats). In the in-phase combination, the mean VORD gain decreased from 1.0 to 0.63 ± 0.02 (n = 2 cats). No significant change of VORD phase was found in any of the cats. Midsagittal or parasagittal pontomedullary brainstem incisions were performed in 4 cats. Recovery of the VOR was tested on the 2nd, 7th, and 30th day after operation. After the 30th day, recovery of the VORD gain stabilized at about 66% of the initial preoperative value. At this stage of the recovery, the optokinetic response (OKN) of the midsagittal-Iesioned cats was practically normal: in the parasagittal-Jesioned cats, the postoperative OKN responses were asymmetric. After stabilization of recovery, lesioned cats were trained with the same adaptation procedure. Although the direct effect of the visuo-vestibular combined stimulation during the training was still operative in all lesioned cats, the adaptive plasticity was completely abolished by the lesions. These results suggest that the commissural brainstem network may play a crucial role in the acquisition of the forced VOR adaptation.

Interaction between the horizontal vestibulo-ocular reflex and optokinetic response in rabbits

1979 ◽  
Vol 37 (1) ◽  
pp. 1-15 ◽  
Author(s):  
C. Batini ◽  
M. Ito ◽  
R. T. Kado ◽  
P. J. Jastreboff ◽  
Y. Miyashita
Keyword(s):  
Optokinetic Response ◽  
Ocular Reflex ◽  
Vestibulo Ocular Reflex

Dynamic properties, interactions and adaptive modifications of vestibulo-ocular reflex and optokinetic response in mice

2001 ◽  
Vol 39 (3) ◽  
pp. 299-311 ◽  
Author(s):  
M. Iwashita ◽  
R. Kanai ◽  
K. Funabiki ◽  
K. Matsuda ◽  
Tomoo Hirano
Keyword(s):  
Dynamic Properties ◽  
Optokinetic Response ◽  
Ocular Reflex ◽  
Vestibulo Ocular Reflex
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