THE EFFECTS OF AUDITORY STIMULI ON THE SUCKING BEHAVIOR IN 1-MONTH-OLD INFANTS

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  • 生後1ヵ月児の吸啜行動に及ぼす聴覚刺激の影響
  • 生後1カ月児の吸啜行動に及ぼす聴覚刺激の影響
  • セイゴ 1カゲツジ ノ キュウセツ コウドウ ニ オヨボス チョウカク シゲキ

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The purpose of this study was to investigate the effects of auditory stimuli on the nonnutritive sucking response in human infants. Subjects were 47 healthy infants about 1-month-old. Half of the subjects were held in their mother's arms and the others were placed in a baby basket for the experiment. Nonnutritive sucking responses were measured with a pressure transducer connected to an empty nursing bottle. Infants sucked on a nipple successively during a test session which consisted of two periods; a 4 minute period of silence followed by 4 minutes of auditory stimulation. White noise or monosyllabic speech sounds were presented intermittently at the level of 70-80dB (B) for the auditory stimulation period. The subject's behavioral responses were recorded on a VTR during the experiment. The results indicated that: 1) Of the 47 infants, 30 (64%) successfully completed the experiment. The remaining infants were excluded from the analysis for the following reasons; sleeping, crying or rejecting the nipple. The percentage of the infants who successfully completed the experiment was high when they were familiar with rubber nipples, were not fed in the 2-3 hours prior to testing or were held in there mother's arms. 2) A difference in the rate of occurrence of the Moro reflex was observed between the presentation of white noise or speech sound. There was also an interaction between the presentation of the stimuli and the infant's placement. The Moro reflex occurred more clearly during white noise than during speech sounds when the infants were placed in a baby basket. 3) There were two main changing patterns of sucking response at the beginning of the auditory stimulus presentation, recovery and a decreased pattern of response. The recovery pattern of response may reflect an arousal response, and the decreased pattern may reflect an orienting response. This suggests that the sucking response in infants may be applicable to audiometry testing in newborn infants.

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