単語親密度の異なる超早口音声の聴取実験を行った結果，（1）心的辞書が活用できることによって学習が促される，（2）聴取者が心的辞書を活用できないと自覚することが心的負荷の上昇をもたらす，などが示唆された．%We investigated the intelligibility of ultra-fast speech which may be used for screen reader for persons with visual disability. The subjects were divided into four groups and they listened to 150 words with the speed of approximately 20 morae/sec. The vocabulary contained the tasks of high and low familiarity words, and the orders of tasks were different by the groups. Four morae Japanese words from the FW03 database were used as the vocabulary of the recall test. As a result, significant learning effect was observed in cases where the subject listened the high familiarity words in succession. This indicates that the learning effect to the ultra-fast speech is promoted when the mental lexical access is easy.
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