Chan Yu Man, Battista Josephine, McKendrick Allison M
Department of Optometry & Vision Sciences, The University of Melbourne, Parkville, 3010, Australia.
J Vis. 2012 Jun 15;12(6):21. doi: 10.1167/12.6.21.
Normal aging has been shown to alter performance on several suprathreshold spatial tasks such as contour integration and perceptual measures of center-surround interactions. The purpose of this study was to investigate the effects of aging on collinear facilitation. Despite all related lateral interactions that are presumed to involve neural architecture within primary visual cortex, collinear facilitation differs from contour integration and surround suppression tasks in that it is a purely foveal, threshold phenomenon. Collinear facilitation was measured for 20 younger (19-31 years) and 15 older (59-71 years) adults with measures repeated over two identical test sessions. Contrast thresholds were measured for a central Gabor patch in the presence of flankers of varying interelement distances and orientations. A reduced magnitude of facilitation was found for the older observers. Our results demonstrate abnormalities of spatial interactions in older adults.
正常衰老已被证明会改变多项超阈值空间任务的表现，如轮廓整合和中心-外周相互作用的感知测量。本研究的目的是调查衰老对共线促进作用的影响。尽管所有相关的侧向相互作用都被认为涉及初级视觉皮层内的神经结构，但共线促进作用与轮廓整合和外周抑制任务不同，因为它是一种纯粹的中央凹阈值现象。对20名年轻人（19 - 31岁）和15名老年人（59 - 71岁）进行了共线促进作用的测量，测量在两个相同的测试环节中重复进行。在存在不同元素间距和方向侧翼刺激的情况下，测量中央Gabor斑块的对比度阈值。结果发现老年观察者的促进作用幅度降低。我们的结果表明老年人存在空间相互作用异常。
