PubMed · 751211
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P P Yeo, K H Yap. 1978. The day the world went ee--e--e--e.. https://pubmed.ncbi.nlm.nih.gov/751211/
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The relationship between the rate of speech flow and speech intelligibility was investigated in normal and hearing-impaired subjects. It is usually observed that a slowly and clearly delivered speech is easier for hearing-impaired patients to understand. The purpose of paper is to analyze this phenomenon clinically and to present useful data for developing new hearing aids. Four or 5 syllabic words lists were prepared for this experiment and speech stimuli were chosen from these lists. The subjects consisted of 15 normal subjects and 79 hearing-impaired patients (57 with inner ear hearing loss and 22 with retrocochlear hearing loss). Hearing tests were performed using a tape recorder with various speech control systems in a soundproof room. Speech samples were presented at three speaking rates, that is, a conversational speech rate, a rate one and a half times as fast as the conversational speech rate and a rate twice as fast as that rate. The results obtained in the normal subjects confirmed that the faster the speaking rate was, the more the word intelligibility was reduced. According to the results in the hearing-impaired subjects, both the correlation coefficient and regression parameter between the word intelligibility in this experiment and speech discrimination scores measured by 57S-monosyllabic lists were low at the conversational speaking rate, but the higher the speaking rate was, the closer the relation between the both factors was. It was estimated by analyzing the data of inner ear hearing loss and retrocochler hearing loss separately that the subjects with retrocochler hearing loss had more difficulty in speech-mediated communication than the subjects with inner ear hearing loss.
Eng and Chang were conjoined twins who were born in Thailand and settled in the United States at the age of 18 years. Numerous surgeons in the United States and Europe examined them and almost all of them believed that an attempt at separation would be fatal. They married sisters and lived on a farm in North Carolina where they loved to hunt wild game. Both used shotguns placed on their right shoulders. At the age of 58 years, it was noted that Chang, who was located to the left of Eng, had a hearing loss in both ears and that Eng had a loss that was greater in the left ear. It is proposed that these hearing losses may have been caused by muzzle-blast injury from hunting and that only the right ear of Eng was privileged to experience the protective effect of head shadow.