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Age Related Changes to Perceptual Surround Suppression of Moving Stimuli.

机译：与年龄有关的变化对运动刺激的感知周围抑制。

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摘要

Perceptual analogues of centre-surround suppression have been applied as indirect measures of cortical inhibitory function in several clinical disorders. Two tasks have been used: a centre-surround contrast per-ception task and a motion direction discrimination task, where the stimulus size and contrast is varied to measure surround suppression effects. The tasks are markedly different, yet previous literature implies that both measures indirectly assess inhibitory function and that results will be complementary. This is not the case for age-related effects on surround suppression, however, as previous reports using the different mea-sures are conflicting. Here we use a low-spatial frequency, drifting grating version of the centre-surround contrast perception task, and compare results to those obtained with the motion direction task in a single group of older observers. Older adults demonstrate significantly increased perceptual surround suppression of contrast for drifting, high contrast stimuli. Using the motion discrimination task, older observers showed similar amounts of surround suppression for the largest stimulus. This study confirms that visual surround suppression is altered by ageing. The complexity of neuronal systems involved in centre-surround inter-actions makes it unlikely that a single perceptual task will be sufficient to describe the effects of clinical disorders on surround suppression. [ABSTRACT FROM AUTHOR]
机译：中心周围抑制的感知类似物已被用作几种临床疾病中皮质抑制功能的间接测量。已经使用了两个任务：中心-环绕对比度感知任务和运动方向判别任务，其中改变刺激大小和对比度以测量环绕抑制效果。任务明显不同，但是以前的文献暗示这两种措施都间接评估了抑制功能，其结果将是互补的。但是，与年龄有关的对环绕声抑制的影响并非如此，因为以前使用不同测量方法的报告存在冲突。在这里，我们使用中心环绕对比度感知任务的低空间频率，漂移光栅版本，并将结果与​​在一组老年观察者中通过运动方向任务获得的结果进行比较。老年人表现出对漂移，高对比度刺激的对比度的感知周围抑制显着增加。使用运动判别任务，年长的观察者对最大刺激显示出相似的环绕抑制量。这项研究证实了视觉周围抑制随着年龄的增长而改变。中枢-周围相互作用中涉及的神经系统的复杂性使得单个感知任务不可能足以描述临床疾病对周围抑制的影响。 [作者的摘要]

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