Department of Neurobiology, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, 1090 Wien, Austria.
J Insect Physiol. 2011 Apr;57(4):494-500. doi: 10.1016/j.jinsphys.2011.01.014. Epub 2011 Jan 31.
The Central American hunting spider Cupiennius salei, like most other spiders, has eight eyes, one pair of principal eyes and three pairs of secondary eyes. The principal eyes and one pair of the secondary eyes have almost completely overlapping visual fields, and presumably differ in function. The retinae of the principal eyes can be moved independently by two pairs of eye muscles each, whereas the secondary eyes do not have such eye muscles. The behavioural relevance of retinal movements of freely moving spiders was investigated by a novel dual-channel telemetric registration of the eye muscle activities. Walking spiders shifted the ipsilateral retina with respect to the walking direction before, during and after a turning movement. The change in the direction of vision in the ipsilateral anterior median eye was highly correlated with the walking direction, regardless of the actual light conditions. The contralateral retina remained in its resting position. This indicates that Cupiennius salei shifts it visual field in the walking direction not only during but sometimes previous to an intended turn, and therefore "peers" actively into the direction it wants to turn.
中美洲穴居狼蛛 Cupiennius salei 像大多数其他蜘蛛一样，有 8 只眼睛，一对主眼和三对副眼。主眼和一对副眼的视野几乎完全重叠，其功能可能不同。主眼的视网膜可以由两对眼肌分别独立移动，而副眼则没有这样的眼肌。通过一种新颖的双通道遥测记录眼肌活动的方法，研究了自由移动蜘蛛的视网膜运动的行为相关性。步行蜘蛛在转弯前后会改变相对于行走方向的同侧视网膜位置。同侧前正中眼的视觉方向变化与行走方向高度相关，而与实际光照条件无关。对侧视网膜保持在静止位置。这表明 Cupiennius salei 在转弯时不仅在转弯过程中，而且有时在转弯之前就将其视野转移到行走方向，因此它会主动“注视”它想要转弯的方向。
