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要旨:目的は,健常成人の摂食時の眼と手の協応を知るために視線と上肢動作の関係を明らかにすることで,対象は21~29歳の女性9名であった.測定は2台のビデオカメラと眼球運動計測装置を用いた.課題はスプーンボールに注がれたジュースを口元に運ぶ動作とした.視線様式は,全員で衝動性眼球運動(SEM),固視(EF),滑動性追従眼球運動(SPEM),SEM,臨界視点(CVP)の順であった.最初,SEM,EFの後に摂食動作が開始し,次にスプーン操作の開始付近でSPEMからSEMに変化し,最後にCVPによって視線がスプーンから離れた.摂食時の眼と手の協応は円滑な動作遂行のモニターにあり,CVPがその最終であることを示唆した.
The purpose of this study was to examine the coordination between visual axis and upper extremity motion during eating among healthy people. Participating subjects were nine women 21-29 years old. Eating motions were recorded by two digital video cameras (DV320; Panasonic, Tokyo), and an eye mark recorder (EMR-8; NAC Image Technology Inc., Tokyo) to detect corneal reflections of infrared light. The eating task consisted of carrying a half spoonful of juice from a plate on a desk to the subjects' mouth. Visual axis patterns appeared in the following order: saccadic eye movement (SEM), visual fixation (VF), smooth pursuit eye movement (SPEM) and critical visual point (CVP) in all subjects. CVP was the spatial location at which visual axis was removed from the round tip of the spoon. First, eating motion started after SEM and VF. Next, the visual axis pattern changed to SEM from SPEM by the start of spoon manipulation in the horizontal plane. Subsequently, the visual axis was removed from the round tip of the spoon between the plate and subject's mouth. Finally, the spoon arrived at the subject's mouth without visual information. These results suggest that the role of eye-hand coordination during eating is the monitoring of smooth upper extremity motion and spoon manipulation, and that the CVP is the final spot.
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