Frey Johannes Daniel, Wendt Mike, Löw Andreas, Möller Stephan, Zölzer Udo, Jacobsen Thomas
Experimental Psychology Unit, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Germany.
Experimental Psychology Unit, Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Germany; Faculty of Human Sciences, Medical School Hamburg/University of Applied Sciences and Medical University, Germany.
Neurosci Lett. 2017 Feb 15;640:13-20. doi: 10.1016/j.neulet.2016.11.063. Epub 2016 Dec 30.
Changes in room acoustics provide important clues about the environment of sound source-perceiver systems, for example, by indicating changes in the reflecting characteristics of surrounding objects. To study the detection of auditory irregularities brought about by a change in room acoustics, a passive oddball protocol with participants watching a movie was applied in this study. Acoustic stimuli were presented via headphones. Standards and deviants were created by modelling rooms of different sizes, keeping the values of the basic acoustic dimensions (e.g., frequency, duration, sound pressure, and sound source location) as constant as possible. In the first experiment, each standard and deviant stimulus consisted of sequences of three short sounds derived from sinusoidal tones, resulting in three onsets during each stimulus. Deviant stimuli elicited a Mismatch Negativity (MMN) as well as two additional negative deflections corresponding to the three onset peaks. In the second experiment, only one sound was used; the stimuli were otherwise identical to the ones used in the first experiment. Again, an MMN was observed, followed by an additional negative deflection. These results provide further support for the hypothesis of automatic detection of unattended changes in room acoustics, extending previous work by demonstrating the elicitation of an MMN by changes in room acoustics.
房间声学的变化为声源-感知者系统的环境提供了重要线索，例如，通过指示周围物体反射特性的变化。为了研究由房间声学变化引起的听觉不规则性的检测，本研究采用了一种让参与者观看电影的被动Oddball范式。声学刺激通过耳机呈现。标准刺激和偏差刺激是通过对不同大小的房间进行建模而创建的，尽可能保持基本声学维度（如频率、持续时间、声压和声源位置）的值不变。在第一个实验中，每个标准刺激和偏差刺激由三个源自正弦波音调的短声音序列组成，每个刺激期间有三个起始点。偏差刺激引发了失配负波（MMN）以及与三个起始点峰值相对应的另外两个负向偏转。在第二个实验中，只使用了一个声音；刺激在其他方面与第一个实验中使用的刺激相同。同样，观察到了MMN，随后是一个额外的负向偏转。这些结果为自动检测房间声学中未被注意到的变化这一假设提供了进一步支持，通过证明房间声学变化引发MMN扩展了先前的研究工作。
