상대 도수 및 조건부 확률에 기반한 촉지각 위치정확성의 추정
Relative frequency and conditional probability based associated dynamic features in extended haptic accuracy
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[목적] 본 연구의 목적은 근-감각과 피부감각 정보가 복합적으로 작용하는 촉지각에 기여하는 중요 속성을 알아보는데 있다. 라켓 또는 채와 같은 도구를 손으로 잡고 있는 상황에서 그 도구의 어디에 해당하는 접촉 위치지각이 어떤 자극속성과 깊은 관계가 있는지 알아보고자 한 것이다. [방법] 이를 위해 실험 참여자(20명)는 시각과 청각을 차단하고 각각 다른 크기와 분포로 손에 잡은 도구에 전해지는 촉지각에 대한 위치를 추정하도록 안내되었다. [결과] 상대 도수 및 조건부 확률을 기반으로 추정된 손에 잡은 도구의 어디에 해당하는 촉지각의 정확성은 (첫째) 동일한 압력의 분포에서 압력의 크기와 관계하였으며 (둘째) 동일한 크기의 압력에서 압력의 분포와도 관계하였다. 그리고 (셋째) 두 자극(압력의 크기와 분포)을 동일한 수준으로 변화하도록 조건화하여 비교한 결과 압력의 크기보다 압력의 분포에 상대적으로 더 안정적인 추정을 보이는 것으로 나타났다. 이러한 결과는 손에 잡은 도구의 위치 지각을 결정하는 양적인 자극 특질이 관성 텐서로 잘 알려진 물리적 속성과 자극에 대한 변이의 추정으로써 잡고 있는 도구에 형성되는 충격중심과 관계가 있는 것으로 사료되었다. [결론] 이는 사전 연구들에서 촉지각의 운동 감각 정보와 피부 감각 정보가 깊은 연관성을 가지고 있음을 강조하지만 이들의 속성을 실험적으로 보고하지 못했던 부분을 다루어 본 일이 될 수 있을 뿐만 아니라, 도구를 이용해 치는(hitting or wielding)종목에서 기구의 제작 및 수행자의 기술 수준을 비교하기 위한 방법으로 적용할 수 있을 것으로 기대한다.
Abstract
[Purpose] This study measured the haptic extroperception accuracy, that is, judging one hit position in a hand-held object. Especially, what factors associated the estimation of contact position when the impact is made at the grasped implement by hitting the ball. [Methods] Relative frequency and conditional probability based analysis verified that perceivers influenced not only the amount of pressure distinguished impressions by the coefficient of restitution but also the pressure distributions encoded impressions by the distance from the hand to the impact. [Results] Results conformed to previous invariant characteristic on dynamic touch in showing that perceiving the location of the impact of grasped objects, including dominant perceiving selectively modality, is constrained by inertial properties with such success requires appreciating the location of the implement’s center of percussion. [Conclusion] Investigated in this planes captured as a mechanical factor, we would suggest a broader hypothesis for further research into the effects of the rotational inertia related to haptic position accuracy in the hand-held object, and leading to different estimates of system function providing an account of generalization that accommodates of its varied aspects.
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