Campbell Tom, Winkler István, Kujala Teija
Helsinki Collegium for Advanced Studies, University of Helsinki, Helsinki, Finland.
Psychophysiology. 2007 Jul;44(4):530-40. doi: 10.1111/j.1469-8986.2007.00529.x. Epub 2007 May 26.
Event-related potentials (ERPs) were recorded for ignored tones presented during the retention interval of a delayed serial recall task. The mismatch negativity (MMN) and N1 ERP components were measured to discern spatiotemporal and functional properties of their generation. A nine-token sequence with nine different tone pitches was more disruptive than an oddball (two-token) sequence, yet this oddball sequence was no more disruptive than a single repeating tone (one-token). Tones of the nine-token sequence elicited augmented N1 amplitudes compared to identical tones delivered in the one-token sequence, yet deviants elicited an additional component (MMN) with distinct temporal properties and topography. These results suggested that MMN and N1 are separate, functionally distinct components. Implications are discussed for the N1 hypothesis and the changing-state hypothesis of the disruption of serial recall performance by auditory distraction.
在延迟序列回忆任务的保持间隔期间，对被忽视的音调记录了事件相关电位（ERP）。测量失匹配负波（MMN）和N1 ERP成分，以辨别其产生的时空和功能特性。一个包含九个不同音调的九元素序列比一个异常刺激（两个元素）序列更具干扰性，但这个异常刺激序列并不比单个重复音调（一个元素）更具干扰性。与在一个元素序列中呈现的相同音调相比，九元素序列中的音调引发了增强的N1振幅，但偏差音调引发了一个具有独特时间特性和地形图的额外成分（MMN）。这些结果表明，MMN和N1是独立的、功能上不同的成分。讨论了这些结果对N1假说以及听觉分心对序列回忆表现干扰的变化状态假说的影响。
