Event-related desynchronization in EEG alpha band during graphical and phonemic memory scan for visually presented kana-characters based on Sernberg memory task

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  • Okuhata Shiho
    Graduate School of Engineering, Kyoto University Research Fellow of the Japan Society for the Promotion of Science（JSPS）
  • Kubo Yuki
    Graduate School of Engineering, Kyoto University
  • Kobayashi Tetsuo
    Graduate School of Engineering, Kyoto University

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Other Title
  • スタンバーグ記憶課題に基づく文字の図形および音韻的照合時におけるアルファ波の事象関連脱同期
  • スタンバーグ キオク カダイ ニ モトズク モジ ノ ズケイ オヨビ オンインテキ ショウゴウジ ニ オケル アルファハ ノ ジショウ カンレン ダツドウキ

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Abstract

<p>Present study investigated event-related desynchronization （ERD） of EEG alpha band during the Sternberg memory task with two memory scanning conditions using Hiragana and Katakana characters. Graphical Identification （GI） required subjects to distinguish the form of the characters （Hiragana/ Katakana） even though the pronunciation of them were the same. On the other hand, phonemical Identification （PI） does not require to distinguish the Hiragana/Katakana characters. Three conditions differ in memory load （1 /3 /5 characters in the memory set） were presented for both GI and PI task. EEGs were recorded from 128 electrodes scattered over the entire head. ERDs/ERSs in the alpha band during the memory scanning phase were examined to investigate the difference between the two identification modes. As a result, dominant ERD over parieto-occipital region was observed for both GI and PI. ERD suppression time, the time until alpha variance recovered from the suppression after the test item presentation, increased with memory load in GI but not in PI. In GI, significant positive correlation between reaction and suppression times was observed in the occipital, parietal, left central and right central areas. On the other hand, no significant correlation was observed in PI for all the areas. These results suggest that the difference between phonemical and graphical identifications during the memory scanning was reflected on the alpha suppression time. Further investigation will be needed to clarify the region-specificity of the suppression time effect according to the memory item based on EEG signal source analysis.</p>

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