Li Zhi, Liang Peiji, Sun Fuchuan
Laboratory of Neurobiology of Shanghai Institute of Physiology, Shanghai Institutes for Biological Sciences and Key Laboratory of Brain and Cognitive Science of Biophysics Institute, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai, 200031, China.
Exp Brain Res. 2006 Jan;168(3):436-40. doi: 10.1007/s00221-005-0180-1. Epub 2005 Dec 2.
Pupillary response can be elicited by a number of visual stimuli. In the present experiments, the pupillary responses to stereo gratings with various spatial frequencies and disparity amplitudes were measured. The spatial frequency was from 0.1 to 1.2 cycles per degree (cpd), and the disparity amplitude was from 4 to 24 min arc. The results showed that pupillary responses can be elicited by all these stereo gratings except when either the spatial frequency or disparity amplitude was reduced to zero. When the disparity amplitude was fixed to 8 min arc, the pupillary response amplitude increased with increasing spatial frequency, eventually reaching a plateau. While the spatial frequency was fixed to 0.3 cpd, the pupillary response amplitude continued to increase within the range of disparity amplitude. This provides a different approach to demonstrate that these pupillary responses were induced by stereo information. In addition, the stereo pupillary responses may be further developed as an objective method to study stereopsis. Finally, plausible underlying mechanisms of the stereo pupillary response are discussed.
瞳孔反应可由多种视觉刺激引发。在本实验中，测量了对具有不同空间频率和视差幅度的立体光栅的瞳孔反应。空间频率为每度0.1至1.2周/度（cpd），视差幅度为4至24分弧度。结果表明，除了空间频率或视差幅度降至零时，所有这些立体光栅均可引发瞳孔反应。当视差幅度固定为8分弧度时，瞳孔反应幅度随空间频率增加而增大，最终达到平稳状态。当空间频率固定为0.3 cpd时，在视差幅度范围内，瞳孔反应幅度持续增大。这提供了一种不同的方法来证明这些瞳孔反应是由立体信息诱导的。此外，立体瞳孔反应可能会进一步发展成为一种研究立体视觉的客观方法。最后，讨论了立体瞳孔反应可能的潜在机制。
