身体の傾きの知覚とその順応

Abstract

Perception on the tilt of the body was investigated to clarify its response mechanism. In this experiment, the tilt of the body in a voluntary was set at the angle of 72 degree from the vertical for ten minutes, then the angle was changed further more or less, and the estimated angles were reported. The estimated angle against the actual angle was plotted on a straight line, and the slope of the line decreased with repeated trials. Comparison between the case without adaptation stimulation and this result with adaptation stimulation showed that there was no difference from the estimated angles with stimulation around the adaptation stimulation (angle of 72 degree), but the remarkable adaptation effect was observed with the estimated angles, on stimulation far from the adaptation stimulation. It was suggested that adaptation in the tilt of body was controlled by a mechanism with a process resemble to the Gibson effect.

身体の傾きの知覚において生じる順応機構の解明を目的とする。被験者の身体を10分間72度に傾け、その後この傾斜角度からさらに大きくあるいは小さく身体を傾け、推定値を被験者に報告させた。身体の実際の傾きに対する推定値は、直線上に並び、試行回数に伴い直線の傾きは小さくなった。順応刺激を与えなかった場合と今回の結果を比較したところ、順応刺激(72度)の周辺刺激に対する推定値では差がないが、順応刺激から離れた刺激に対して、顕著な順応効果が認められた。身体の傾きの順応がギブスン効果に類似した過程を持つ1機構により媒介されていることが示唆される。