Clapp Wesley C, Johnson Blake W, Hautus Michael J
Research Centre for Cognitive Neuroscience, University of Auckland, Auckland, New Zealand.
Neuroreport. 2007 Mar 5;18(4):365-8. doi: 10.1097/WNR.0b013e32801776d1.
To determine whether electroencephalogram components elicited by dichotic pitch stimuli are all-or-none threshold-like responses or graded responses that depend on the saliency of the stimuli, we recorded electroencephalograms while participants listened to dichotic pitch stimuli constructed with different signal-to-background ratios. The object-related negativity and P400 components were largest when the dichotic pitch was most salient (high signal-to-background ratio), and decreased in amplitude with decreasing signal-to-background ratio. These results are similar to those reported for mistuned harmonics, thereby providing additional evidence that the object-related negativity and P400 components observed for these disparate stimulus types reflect similar processing. They also support the notion that the object-related negativity and P400 amplitudes are dependent on the level of relevant cue-based stimulus information.
为了确定双耳音调刺激引发的脑电图成分是全或无的阈值样反应还是取决于刺激显著性的分级反应，我们在参与者聆听以不同信噪比构建的双耳音调刺激时记录了脑电图。当双耳音调最显著（高信噪比）时，与客体相关的负波和P400成分最大，并且随着信噪比降低，其振幅减小。这些结果与针对失谐谐波报道的结果相似，从而提供了额外的证据，表明针对这些不同刺激类型观察到的与客体相关的负波和P400成分反映了相似的加工过程。它们还支持这样一种观点，即与客体相关的负波和P400振幅取决于基于相关线索的刺激信息水平。
