Institute for Psychology, Hungarian Academy of Sciences, H-1394 Budapest, Hungary.
Biol Psychol. 2010 Mar;83(3):229-38. doi: 10.1016/j.biopsycho.2010.01.004. Epub 2010 Jan 11.
Event-related potential (ERP) correlates of distraction are usually investigated in the oddball paradigm following a discrete, trial-by-trial stimulation protocol. In this design, participants perform a discrimination task while oddball stimuli deviate in a task-irrelevant stimulus feature. In our experiment, participants detected gaps in a continuous tone while infrequent frequency glides served as distracting events. Glides preceding a gap by 150ms delayed the response to the gap and elicited the ERP sequence of N1, probably MMN, P3a, and reorienting negativity, suggesting that these responses reflect distraction-related processes which are neither task- nor stimulation-specific. When participants watched a silent movie and the auditory stimulation was task-irrelevant, glides preceding a gap by 150ms enhanced the amplitude of the gap-elicited N1. However, when the auditory stimulation was task-relevant, the gap-elicited N1 was attenuated. These results show that the glides drew attention away from the ongoing task, both from watching the silent movie and from detecting gaps.
事件相关电位（ERP）的分心相关物通常是在离散的、逐个试验刺激方案的情况下，在偏离范式中进行研究的。在这种设计中，参与者在执行辨别任务时，奇数刺激在与任务无关的刺激特征上偏离。在我们的实验中，参与者在连续音调中检测到间隙，而不频繁的频率滑音作为分散注意力的事件。滑音比间隙提前 150ms 会延迟对间隙的反应，并引起 N1、可能是 MMN、P3a 和重新定向负性的 ERP 序列，表明这些反应反映了与分心相关的过程，这些过程既不是任务特异性的，也不是刺激特异性的。当参与者观看无声电影且听觉刺激与任务无关时，滑音比间隙提前 150ms 会增强间隙引起的 N1 的振幅。然而，当听觉刺激与任务相关时，间隙引起的 N1 会减弱。这些结果表明，滑音会将注意力从正在进行的任务中转移开，无论是看无声电影还是检测间隙。
