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Speech-to-song effect
The Speech-to-Song Illusion was discovered by Diana Deutsch in 1995. She was fine-tuning her spoken commentary at the beginning of her CD "Musical Illusions and Paradoxes".〔 〕 In the process, she had put the phrase ‘sometimes behave so strangely’ on a loop, and she noticed that after it had been repeated several times it sounded as though it was sung rather than spoken. As a further twist, she noted that when the original sentence containing this phrase was again played, it began by sounding like normal speech, but when it came to the phrase that had been repeated, it appeared to burst into song. Deutsch later included this illusion in her CD "Phantom Words and Other Curiosities".〔 〕
==Experiments==
Deutsch, Henthorn and Lapidis showed that in order for the illusion to occur, the phrase needs to be repeated exactly; repeating the phrase under transposition or with the words in jumbled orderings did not cause it to be heard as sung. They also created sound demonstrations showing how subjects repeat back the phrase after it had been repeated ten times (it is obviously being sung) and after it has been presented only once (it is obviously being spoken).
Falk and Rathke showed that the speech-to-song illusion can occur when German subjects listened to German sentences as well. These authors also showed that certain physical properties of the acoustic signal facilitated the development of the illusion. Later, Vanden Bosch Der Nederlanden replicated the findings of Deutsch et al., and showed that the illusion is obtained both by people who are musically trained and also by those who are untrained. She also confirmed that transposing the repeating phrase reduced the transformation effect. In addition she found that altering the temporal characteristics of the repeating phrase did not affect the illusion. Tierney, Dick, Deutsch, and Sereno explored the neuroanatomical underpinnings of the illusion. They employed a corpus of spoken phrases that came to be heard as sung rather than spoken following several repetitions, and also a matched corpus of spoken phrases that continued to be heard as spoken following the same amount of repetition. Subjects listened to these phrases while their brains were being scanned using fMRI, and found that a network of regions, particularly in the temporal lobe, responded more strongly to the speech that was heard as sung. This network overlapped with regions that were previously associated with pitch perception and song production.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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