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揺動刺激と音刺激を、児に個別に呈示した場合と同時に呈示した場合の児の鎮静効果を、行動観察、心拍数、自律神経活動指標により比較検討した。被験児は、月齢3～4ヶ月の乳児6名とした。児に呈示する揺動刺激は、母親が抱いて揺らす刺激と、機械的に電動で揺らす刺激の2種類とし、音刺激は、A特性音圧レベル70 dBのブラウンノイズとした。実験の結果、機械的に電動で揺らす刺激には児を鎮静させる効果が認められ、母親が...抱いて揺らす刺激にも一定の効果が認められたが、機械的に電動で揺らす刺激ほど明確ではなかった。音刺激では、ブラウンノイズに児を鎮静させる効果が認められた。児の行動観察および心拍数では、両刺激は独立して児の鎮静化に関与した可能性が示された。また、既報の月齢7～8ヶ月児の結果との比較から、月齢3～4ヶ月児と月齢7～8ヶ月児では、鎮静効果が認められた刺激条件が異なっていた。
In the present study, the calming responses of infants to swinging and sound stimuli were evaluated using behavioral scores (based on crying and facial expression), heart rate, and indices of autonomic nervous system activity. The swinging stimuli consisted of maternal holding-and-rocking and an electric swinging apparatus. The sound stimuli included brown noise and a “no sound” condition. Brown noise was presented to the infants at a sound pressure level of 70 dB (A-weighted). Six infants, aged three to four months, were exposed to both swinging and sound stimuli, either indi- vidually or simultaneously. The primary findings suggested that the electric swinging stimulus had a calming effect on the infants. The maternal holding-and-rocking stimulus also showed a calming effect, although it was less clear than that of the electric swinging stimulus. Brown noise also showed a calming effect on the infants. Behavioral scores and heart rate suggested that swinging and sound stimuli independently contributed to infant calming. In addition, comparison with previously reported results for infants aged seven to eight months showed that the stimulus conditions under which calming effects were observed differed between infants aged three to four months and those aged seven to eight months.続きを見る
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