赤毛ザルの温度眼振第二相
頭位と眼球回転軸との関係
1990 年 21 巻 1 号 p. 171-172
詳細
1990 年 21 巻 1 号 p. 171-172
The effect of head position on the second phase of caloric nystagmus was investigated in three rhesus monkeys. The monkey was seated in a gimbal chair with the head held in a position 15° down. Eye movements were recorded three dimensionally, using a three-magnetic coil system. The 20°C water was irrigated into the external canal and the first phase of caloric nystagmus was recorded either in the supine or in the prone position. During the second phase of caloric nystagmus, the monkey was positioned on the side either 90° right ear up or down, or upright. In the supine or prone position, the torsional nystagmus component was predominant. In the upright position, the horizontal component was the most intensive. In the side positions, the vertical component was predominant. We put forward the hypothesis that this response pattern mainly reflects otolithic function.
