Effect of Vestibular-proprioceptive Stimulation on the Expectancy Response in Persons with Profound Retardation

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  • 重症心身障害者の期待に「ゆらし」刺激が及ぼす効果 : 心拍変動を中心に
  • ジュウショウ シンシン ショウガイシャ ノ キタイ ニ ユ ラ シ シゲキ ガ

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Abstract

Because of the severe dysfunction of their central nervous system, persons with profound retardation have weak responsiveness, which is related to their expectancy of receiving stimuli. In the educational situation, it has been indicated that intervention with vestibular-proprioceptive stimulation evokes not only smiling or laughing, but also the occurrence of behavior related to the expectancy of receiving stimuli from the environment. The present study aimed to evoke this expectancy response by use of vestibular-proprioceptive stimulation, and to examine its effects on the occurrence of expectancy, through measuring emotional expression. Twenty persons with profound retardation (developmental age between 3 months and 1 year) participated. The experimenter showed his upper body through a window of a booth 2m. from the subjects, and called the subject's name for 2 sec (S1 condition). Then he hid his body for 3 sec. Again he presented himself behind a screen 0.8m. from the subjects and called the subject's name for 3 sec (S1-S2 condition). We presented another condition (S1-S2V condition) as a comparison, which was S2 combined with vestibular-proprioceptive stimulation. Heart rate was recorded simultaneously to examine the presence of anticipatory deceleration. The results were as follows: 10 subjects who exhibited deceleration in heart rate in the S1-S2 condition showed the same change in the S1-S2V condition. These subjects expressed the emotional behavior of smiling or laughing. Six subjects exhibited a gradual increase in heart rate in the S1-S2 condition, and a gradual decrease in the S1-S2V condition. Two subjects showed acceleration of heart rate in the S1-S2V condition, which indicated a defensive response. These results indicated that vestibular-proprioceptive stimulation might be effective to evoke the expectancy response in persons with profound retardation.

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