Responses to deviants are modulated by subthreshold variability of the standard.

Responses to deviants are modulated by subthreshold variability of the standard.
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DOI:
10.1111/j.1469-8986.2011.01274.x
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发表时间:
2012-01
期刊:
影响因子:
3.7
通讯作者:
Ahissar M
Ahissar M
中科院分区:
心理学3区
文献类型:
--
作者:
Daikhin L;Ahissar M

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听觉机制自动检测声音的基本特征和控制其呈现的规则。在oddball范式中,当相同的参考音调持续重复时,听觉系统检测到“相同性”(或无变化性)规则。我们现在使用两个古怪的协议,经典的一个固定的参考,和修改的一个抖动的参考,以确定听觉系统是否可以检测到亚阈值违反“相同”。我们发现,对重复标准的响应不会被小抖动所改变。然而,在抖动协议下,对频率oddball的反应较小,表明对“相同性”的超敏反应。抖动的敏感性是最大的,当古怪的偏离8%,较小的40%,并在100%的偏差消失,表明敏感性“相同”是上下文相关的,即,它是缩放相对于整体范围的刺激。
Auditory mechanisms automatically detect both basic features of sounds and the rules governing their presentation. In the oddball paradigm, the auditory system detects the "sameness" (or no-variability) rule when the same reference tone is consistently repeated. We now used two oddball protocols, the classical one with a fixed reference, and a modified one with a jittered reference to determine whether the auditory system can detect sub-threshold violations of "sameness". We found that the response to the repeated standard was not modified by the small jitter. However, the response to the frequency oddball was smaller under the jittered protocol, indicating hypersensitivity to "sameness". The sensitivity to jitter was largest when the oddball deviated by 8%, smaller for 40% and disappeared at 100% deviation, indicating that sensitivity to "sameness" is context dependent; namely, it is scaled with respect to the overall range of stimuli.
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