Fan W C, Brown B, Yap M K
Department of Optometry and Radiography, Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Ophthalmic Physiol Opt. 1996 May;16(3):196-202.
A new stereoacuity test, the double two rod test, uses a two-alternative forced-choice (2AFC) paradigm. The subject's task is to state which pair of rods, the left or the right, contains depth information. The test gives repeatable results; comparison between the depth threshold measured binocularly and monocularly suggests that monocular cues, if present, provide only poor depth information, compared to the depth information arising from binocular disparity. As part of an investigation of stereoacuity and ageing, we tested stereoacuity as a function of viewing time and the number of comparisons made between the two pairs of rods. Stereoacuity was significantly reduced for viewing times less than 3 s while longer viewing times did not improve stereoacuity. The number of comparisons made between the two pairs of rods had no effect on stereoacuity.
一种新的立体视敏度测试，即双双杆测试，采用了二项迫选（2AFC）范式。受试者的任务是指出哪一对杆（左边的还是右边的）包含深度信息。该测试能给出可重复的结果；双眼和单眼测量的深度阈值之间的比较表明，与双眼视差产生的深度信息相比，单眼线索（如果存在的话）只能提供较差的深度信息。作为对立体视敏度和衰老研究的一部分，我们测试了立体视敏度作为观看时间和两对杆之间比较次数的函数。观看时间少于3秒时，立体视敏度显著降低，而较长的观看时间并未改善立体视敏度。两对杆之间的比较次数对立体视敏度没有影响。
