Neural Processing of Octave Illusion in Auditory Cortex Revealed by Frequency Tagging Method

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  • Aizawa Yoshiki
    Graduate School of Science and Engineering, Tokyo Denki University
  • Pilyugina Nina
    Graduate School of Advanced Science and Technology, Tokyo Denki University
  • Tsukahara Akihiko
    Graduate School of Science and Engineering, Tokyo Denki University
  • Tanaka Keita
    Graduate School of Science and Engineering, Tokyo Denki University

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  • 周波数タグ付けを用いたオクターブ錯聴における聴覚情報処理
  • シュウハスウ タグ ズケ オ モチイタ オクターブサクチョウ ニ オケル チョウカク ジョウホウ ショリ

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Abstract

<p>We measured the auditory steady state responses (ASSR) in a magnetoenchephalogram to study the mechanism of neural processing in the auditory cortex with octave illusion proposed by Diana Deutsch. Octave illusion is induced using consecutive dichotic sounds, where two tones that are one octave apart, e.g., 400 and 800 Hz, are alternated between the ears at 500-ms intervals. We then applied the frequency tagging method to the ASSRs that were recorded during the octave illusion. We compared the ASSR amplitude between non-illusion and illusion groups. The results showed that there was difference in the ASSR amplitude of the auditory cortex between the illusion and the non-illusion groups. In non-illusion group, the ASSR was showed right hemisphere dominance and contralateral activation. There was no significant difference in the illusion group. These results suggest that right hemisphere dominance and contralateral activation are related to neural processing of the octave illusion.</p>

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