Neural signatures of temporal regularity and recurring patterns in random tonal sound sequences
Neural signatures of temporal regularity and recurring patterns in random tonal sound sequences
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DOI：
10.1111/ejn.15123
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发表时间：
2021-02-12
影响因子：
3.4
通讯作者：
Grimm, Sabine
中科院分区：
文献类型：
--
作者：
Hodapp, Alice;Grimm, Sabine
听觉系统对声音输入中的重复模式高度敏感--即使是在其他非结构化材料中，如白噪声或随机音调序列。脑电(EEG)研究揭示了周期性重复听觉模式的特征负电位--一种被解释为与记忆痕迹相关和特定的反应，而不是周期性驱动的夹带的迹象。在这里，我们的目的是通过研究周期声音序列固有的时间规律性对事件相关电位的影响来区分这两种可能的贡献。参与者被呈现给参与者随机音调的连续短音调序列，其中一些序列包含反复出现的模式，并被要求指出他们是否听到了重复。模式要么在随机序列上均匀分布(等时条件)，要么具有时间抖动(抖动条件)，这使我们能够区分事件相关电位(从而与重复模式的记忆轨迹相关联的处理操作)和重复的周期性。负性复发相关成分可以独立于时间规律性被观察到，是特定于模式的，并被模式的交叉试验重复所调制。关键的是，等时模式重复诱导了额外的早期周期性相关的积极成分，它在模式开始之前就已经开始积累，即使在重复模式偶尔不出现的情况下，它也被不受抑制地诱发。这一积极成分可能反映了一种感觉驱动的夹带过程，这可能是检测暂时规则重复的行为益处的基础。
The auditory system is highly sensitive to recurring patterns in the acoustic input - even in otherwise unstructured material, such as white noise or random tonal sequences. Electroencephalography (EEG) research revealed a characteristic negative potential to periodically recurring auditory patterns - a response, which has been interpreted as memory trace-related and specific, rather than as a sign of periodicity-driven entrainment. Here, we aim to disentangle these two possible contributions by investigating the influence of a periodic sound sequence's inherent temporal regularity on event-related potentials. Participants were presented continuous sequences of short tones of random pitch, with some sequences containing a recurring pattern, and asked to indicate whether they heard a repetition. Patterns were either spaced equally across the random sequence (isochronous condition) or with a temporal jitter (jittered condition), which enabled us to differentiate between event-related potentials (and thus processing operations associated with a memory trace for a repeated pattern) and the periodic nature of the repetitions. A negative recurrence-related component could be observed independently of temporal regularity, was pattern-specific, and modulated by across trial repetition of the pattern. Critically, isochronous pattern repetition induced an additional early periodicity-related positive component, which started to build up already before the pattern onset and which was elicited undampedly even when the repeated pattern was occasionally not presented. This positive component likely reflects a sensory driven entrainment process that could be the foundation of a behavioural benefit in detecting temporally regular repetitions.