The Orienting-Searching Response in Severely and Profoundly Handicapped Children

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  • 重症心身障害児の定位・探索反応の分析
  • ジュウショウ シンシン ショウガイジ ノ テイイ タンサク ハンノウ ノ ブン

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Abstract

This study investigates the features of the orienting-search response in severely and profoundly handicapped children by analyzing behavioural reactions and heart rate (HR). The subjects included 27 infants of normal intelligence (mean CA=1:1), and 22 severely and profoundly handicapped children (mean CA=14:2; DA=0:9). Seven stimuli were used in the study-a vibrator, a pure tone, a flashing light, music, the calling of the subject's name, a toy police patrol car, and an approaching stranger. The responses to these varying stimuli were analyzed for orienting-searching behaviour and HR variation was established by the measurement of the R-R interval. Results indicate a relationship between the orienting-search response and HR reaction. This was found to be less signification in severely and profoundly handicapped children than in normal infants, particularly when the stimulus was presented in the first trial or in the first stage of the experiment. However, no differences between groups were observed in the frequency of responses and the percentage of responses observed following the first trial. Further, severely and profoundly handicapped children (CA=24 weeks) as a group were delayed in exhibiting the HR reaction, but on an individual basis it was possible to elicit a response. This suggests these infants are receptive to stimuli, but that this response is delayed and variable. For example, it was found that severely and profoundly handicapped children are more receptive to auditory stimuli than non-disabled controls. Finally, the nature of the subject's response to novel stimuli (toy police patrol car) and familiar stimuli (calling the subject's name) suggest the presence of secondary attention behaviour which we describe as the searching response.

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