Visual temporal order judgment in profoundly deaf individuals
Visual temporal order judgment in profoundly deaf individuals
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DOI：
10.1007/s00221-008-1459-9
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发表时间：
2008-09-01
影响因子：
2
通讯作者：
Pavani, Francesco
中科院分区：
文献类型：
--
作者：
Nava, Elena;Bottari, Davide;Pavani, Francesco
我们调查了时间处理深度耳聋的个人，通过测试他们的能力，使时间顺序判断（TOJs）的视觉刺激对中央或周边的视觉偏心。十名重度耳聋的参与者判断出现在中央注视相对两侧的两个视觉刺激中哪一个首先被传递。采用恒定刺激的方法，在不同的刺激起始时间点（SOA），对称地（在中心或外周位置）或不对称地（即一个中心和另一个外周）呈现刺激。两组听力控制也进行了测试，在这项任务中：10听力控制剥夺测试过程中和12听力控制谁没有受到任何剥夺程序。时间顺序阈值（即，只是明显的差异）和点的主观性的两个视觉刺激组之间没有差异。然而，更快的歧视反应，系统地观察到聋人比任何一组听力控制，特别是当第一个两个刺激出现在周边位置。与以前的一些研究结果相反，我们的研究结果表明，终身听觉剥夺不会改变毫秒范围内的时间处理能力。事实上，我们表明，聋人参与者获得了与听力控制相似的时间阈值，同时反应也快得多。这种增强的反应性记录在这里的第一次在时间处理任务的背景下，我们认为它可能构成一个重要方面的功能变化发生的后果，深刻的耳聋。
We investigated temporal processing in profoundly deaf individuals by testing their ability to make temporal order judgments (TOJs) for pairs of visual stimuli presented at central or peripheral visual eccentricities. Ten profoundly deaf participants judged which of the two visual stimuli appearing on opposite sides of central fixation was delivered first. Stimuli were presented either symmetrically, at central or peripheral locations, or asymmetrically (i.e. one central and the other peripheral) at varying stimulus onset asynchronies (SOAs) using the method of constant stimuli. Two groups of hearing controls were also tested in this task: 10 hearing controls auditory-deprived during testing and 12 hearing controls who were not subjected to any deprivation procedure. Temporal order thresholds (i.e. just noticeable differences) and points of subjective simultaneity for the two visual stimuli did not differ between groups. However, faster discrimination responses were systematically observed in the deaf than in either group of hearing controls, especially when the first of the two stimuli appeared at peripheral locations. Contrary to some previous findings, our results show that a life-long auditory deprivation does not alter temporal processing abilities in the millisecond range. In fact, we show that deaf participants obtain similar temporal thresholds to hearing controls, while also responding much faster. This enhanced reactivity is documented here for the first time in the context of a temporal processing task, and we suggest it may constitute a critical aspect of the functional changes occurring as a consequence of profound deafness.