Tanaka Keita, Kurasaki Hiroki, Kuriki Shinya
Department of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama, Hikigun, Saitama, 350-0394, Japan.
Department of Science and Engineering, Tokyo Denki University, Ishizaka, Hatoyama, Hikigun, Saitama, 350-0394, Japan.
Hear Res. 2018 Mar;359:85-90. doi: 10.1016/j.heares.2018.01.001. Epub 2018 Jan 8.
The auditory "octave illusion" arises when dichotic tones, presented one octave apart, alternate rapidly between the ears. This study aimed to explore the link between the perception of illusory pitches and brain activity during presentation of dichotic tones. We conducted a behavioral study of how participants perceived binaural dichotic tones of octave illusions and classified them, based on the reported percepts, in an illusion (ILL) group, without an illusion (non-ILL) group, and others. We recorded brain activity using functional magnetic resonance imaging and analyzed the activation due to dichotic illusion tones. The activation in the bilateral planum polare in the auditory cortex was significantly larger in the ILL group than in the non-ILL group. In the right premotor cortex, the non-ILL group showed a significantly larger activation than did the ILL group, suggesting that the sensation of the meter to the stimulus sound was significant in the non-ILL but not in the ILL group. The results indicated that the activity in these areas was related to the occurrence of octave illusions. The nonsignificant sensation of the meter to the stimulus sound in the ILL group may be consistent with the perception of octave illusion.
当以一个八度音程间隔呈现的双耳分听音调在两耳之间快速交替时，就会产生听觉“八度错觉”。本研究旨在探讨在双耳分听音调呈现过程中，虚幻音高的感知与大脑活动之间的联系。我们进行了一项行为研究，观察参与者如何感知八度错觉的双耳分听音调，并根据报告的感知将他们分为错觉（ILL）组、无错觉（非ILL）组和其他组。我们使用功能磁共振成像记录大脑活动，并分析双耳错觉音调引起的激活情况。听觉皮层双侧极平面的激活在ILL组中显著大于非ILL组。在右侧运动前皮层，非ILL组的激活明显大于ILL组，这表明非ILL组对刺激声音的节拍感显著，而ILL组则不然。结果表明，这些区域的活动与八度错觉的发生有关。ILL组对刺激声音的节拍感不显著可能与八度错觉的感知一致。
