Winkler I, Tervaniemi M, Schröger E, Wolff C, Näätänen R
Institute for Psychology, Hungarian Academy of Sciences, Budapest.
Neurosci Lett. 1998 Feb 6;242(1):49-52. doi: 10.1016/s0304-3940(98)00022-6.
Auditory event-related potentials were recorded from reading subjects to frequent and infrequent tones. Frequent tones presented by a loudspeaker in front of the subject were interspersed with infrequent tones delivered either by one of the symmetrically-placed lateral loudspeakers, or by both lateral loudspeakers simultaneously. This latter sound was perceived as originating from a spacious source in the direction of the central loudspeaker. A sizable mismatch negativity (MMN) and P3a were elicited by all three infrequent stimuli, suggesting that infrequent changes in the direction or perceived spaciousness of the sound source were preattentively detected. In addition, a dissociation between the MMN and P3a amplitudes was found: whereas lateral deviants elicited a larger P3a than the simultaneous left + right deviant, the MMN amplitude was approximately equal for all three deviants.
从阅读受试者中记录了与听觉事件相关的电位，以应对频繁和不频繁的音调。由受试者前方的扬声器发出的频繁音调与由对称放置的侧向扬声器之一或两个侧向扬声器同时发出的不频繁音调穿插出现。后一种声音被感知为来自中央扬声器方向的一个宽敞声源。所有三种不频繁刺激都引发了相当大的失配负波（MMN）和P3a，这表明声源方向或感知到的宽敞度的不频繁变化在注意力前就被检测到了。此外，还发现了MMN和P3a振幅之间的分离：虽然侧向偏差比同时出现的左 + 右偏差引发了更大的P3a，但所有三种偏差的MMN振幅大致相等。
