Zwicker Amy E, Hoag Ryan A, Edwards Veronica T, Boden Catherine, Giaschi Deborah E
Department of Psychology, University of British Columbia, Vancouver, British Columbia, Canada.
Optom Vis Sci. 2006 Jun;83(6):382-90. doi: 10.1097/01.opx.0000222919.21909.1e.
The purpose of this study is to determine how decreased visual acuity affects performance on tasks of motion and texture perception.
Positive diopter lenses were used to match three subjects at five levels of decimal visual acuity (DVA) ranging from an uncorrected DVA of 1.6 to the lowest DVA of 0.2. Performance thresholds were determined at each acuity level for five different psychophysical tasks. The tasks assessed the perception of motion-defined form, global motion, maximum motion displacement (Dmax), texture-defined form, and global texture.
Reducing visual acuity decreased performance on the tasks of motion-defined form identification, texture-defined form identification, and global texture integration. Performance on the Dmax task improved with a reduction in visual acuity. Performance on the global motion task was unaffected by changes in visual acuity.
Visual acuity should be considered when interpreting the results of developmental or clinical studies of motion and texture perception. The only exception to this is global motion perception, at least when DVA is better than 0.2. The effect of blur on tasks of motion and texture perception may reflect the extent to which high spatial frequency information is required for performance on these tasks.
本研究的目的是确定视力下降如何影响运动和纹理感知任务的表现。
使用正屈光度镜片，将三名受试者的视力匹配到五个小数视力（DVA）水平，范围从未矫正的DVA为1.6到最低的DVA为0.2。在每个视力水平下，针对五种不同的心理物理学任务确定表现阈值。这些任务评估了运动定义形状、全局运动、最大运动位移（Dmax）、纹理定义形状和全局纹理的感知。
降低视力会降低运动定义形状识别、纹理定义形状识别和全局纹理整合任务的表现。Dmax任务的表现随着视力降低而提高。全局运动任务的表现不受视力变化的影响。
在解释运动和纹理感知的发育或临床研究结果时应考虑视力。唯一的例外是全局运动感知，至少当DVA优于0.2时。模糊对运动和纹理感知任务的影响可能反映了这些任务表现所需的高空间频率信息的程度。
