Saarinen J, Levi D M
College of Optometry, University of Houston, TX 77204-6052.
Vision Res. 1995 Feb;35(4):519-27. doi: 10.1016/0042-6989(94)00141-8.
It has been suggested that the improvement of vernier acuity in the course of practice reflects "fine tuning" of the visual mechanisms underlying vernier acuity. Masking studies suggest that an important source of information by which the visual system may accomplish fine vernier acuity is the activity in orientation tuned channels. Therefore, we investigated whether improvement in vernier acuity after training was accompanied by systematic changes in the orientation tuning characteristics of vernier acuity (as revealed by simultaneous spatial noise masking). The results show large interindividual variation in learning vernier acuity. However, they reveal a close correspondence between the improvement in vernier acuity and the narrowing of the orientation tuning function. Thus, the results provide some support for the notion of narrowing of the orientation characteristics of vernier acuity in the course of learning.
有人提出，在练习过程中视敏度的提高反映了视敏度背后视觉机制的“微调”。掩蔽研究表明，视觉系统实现精细视敏度的一个重要信息来源是方向调谐通道中的活动。因此，我们研究了训练后视敏度的提高是否伴随着视敏度方向调谐特性的系统性变化（通过同时进行的空间噪声掩蔽揭示）。结果显示，在学习视敏度方面个体间存在很大差异。然而，它们揭示了视敏度的提高与方向调谐函数变窄之间的密切对应关系。因此，这些结果为学习过程中视敏度方向特性变窄的观点提供了一些支持。
