Daddaoua N, Dicke P W, Thier P
Center for Neurology, Hertie Institute for Clinical Brain Research, Dept. Cognitive Neurology, University of Tuebingen, Otfried-Mueller-Str. 27, 72076 Tuebingen, Germany.
Vision Res. 2011 Sep 1;51(17):1986-93. doi: 10.1016/j.visres.2011.07.013. Epub 2011 Jul 23.
To investigate the effect of head roll tilt on the binocular coordination of ocular counterroll in non-human primates, we measured binocular ocular counterroll in two rhesus monkeys fixating a straight ahead target, while adopting different head roll tilt positions. We used two infrared cameras to take snapshots of the left and the right eye in order to measure the resulting ocular counterroll responses. The horizontal and vertical components of the position of one of the two eyes where measured using an implanted 2D-search coil in one monkey and video-based eye tracking in the second one. We consistently observed disconjugate ocular counterroll responses to static head roll in both monkeys. Invariably, the eye positioned further away from ground level by roll tilting the head always exhibited larger ocular counterroll than the other eye. The pattern of disconjugacy of the ocular counterroll responses exhibited by rhesus monkey parallels the one described for humans. The correspondence between the two species suggests that monkeys may serve as useful models in studies of the neuronal underpinnings of tilt-induced ocular counterroll and the perceptual compensation of uncompensated retinal image tilt.
为研究头部侧倾对非人灵长类动物双眼视轴偏斜协调性的影响，我们在两只恒河猴注视前方固定目标时，测量了它们在不同头部侧倾位置下的双眼视轴偏斜情况。我们使用两台红外摄像机对左右眼进行快照，以测量由此产生的视轴偏斜反应。在一只猴子中，使用植入的二维搜索线圈测量其中一只眼睛位置的水平和垂直分量，在另一只猴子中则使用基于视频的眼动追踪技术。我们在两只猴子中均持续观察到对静态头部侧倾的双眼视轴偏斜反应不一致。通过头部侧倾，总是离地面更远的那只眼睛表现出比另一只眼睛更大的视轴偏斜。恒河猴表现出的视轴偏斜反应不一致模式与人类描述的模式相似。这两个物种之间的对应关系表明，猴子可能是研究倾斜诱导的视轴偏斜的神经元基础以及未补偿视网膜图像倾斜的感知补偿的有用模型。
