Role of the neuronal activity of nucleus prepositus hypoglossi in optokinetic stimulation in the cat.
The role of the neuronal activity of nucleus prepositus hypoglossi (NPH) in optokinetic stimulation (OKS) and the changes of the activity between OKS and off-OKS (resting condition) were investigated in 5 adult cats. In order to make OKS velocity equal to retinal slip velocity, the cats' eyes were immobilized. The directions of the OKS were clockwise (CW) and counterclockwise (CCW), and 3 types of velocities, 2 degrees/s, 5 degrees/s and 10 degrees/s, were used. The numbers of spikes of 37 NPH neurons to OKS did not increase compared with those to off-OKS, also there were no significant differences between those to CW-OKS and CCW-OKS, and between those of the rostral and caudal parts of NPH. The NPH neurons did not react to the retinal slip, and we suppose the result is due to the immobilized eye condition.
Sato
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Department of Otolaryngology, St. Marianna University School of Medicine, Kawasaki, Japan.
Kato
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Watanabe
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Takeyama
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D000818:Animals; D002415:Cats; D009474:Neurons / Q000502:physiology*; D009900:Optic Nerve / Q000502:physiology*; D010775:Photic Stimulation