Fente defence with occluded vision: The differences of anticipating accuracy and confidence as a spatial occlusion region and fencing expertise Joo Young Lee 2, Seungmin Lee 1 *, & Jong Seong An 3 1 Daechon Middle School, 2 Chungnam National University, & 3 Seoul National University [Purpose] [Methods] [Results] [Conclusions] Key words:

Fig. 1. Non-occlusion fente motion and six body region

Fente defence with occluded vision 719 Body region 1: Wrist/Fencing foil Body region 2: Arm/Shoulder Body region 3: Head Body region 4: Torso Body region 5: Front leg Body region 6: Hind leg Fig. 2. Spatial Occlusion technique: Occluded body region (6 different body parts) 연구절차 모든 피험자는 본 실험에 참여하기 전에, 연구 목적에 대한 충분한 설명을 전달받았으며, 개인별로 실험 참여에 대한 동의서를 작성하였다. 본 연구의 과제는 스크린을 통 해 제시되는 여섯 가지 공간차단 영상과 차단하지 않은 영 상을 포함한 총 7가지 영상을 통하여 상대 선수의 공격 기 술에 대한 방향을 정확히 예측하는 것이다. 본 연구에서 제시되는 영상은 펜싱 경기에서 가장 많이 사용되는 팡트 공격 기술로 제한하였다. 본 연구에 사용된 팡트 동작 영상 은 실험에 참여하지 않은 펜싱 숙련자 3명이 세 가지 공격 위치(몸통, 허벅지, 발끝)로 공격하는 영상을 촬영하였다. 공격영상 촬영 시에 실제 경기상황에서 공격자의 높이를 고려하여 1.4m로 선정하였고, 공격 포지션에서 1.8m 떨 어진 위치에서 촬영을 하였다. 촬영된 영상은 아도브 프리 미어 영상편집 프로그램을 이용하여 여섯 가지 공간차단 영역(P1: 손목/펜싱 칼, P2: 팔/어깨, P3: 머리, P4: 몸통, P5: 앞발, P6: 뒷발)과 차단하지 않은 조건으로 구 분하여 하나의 영상파일이 2~3초 정도 되도록 편집하여 실험에 사용할 영상으로 제작하였다. 공격위치와 공간차 단 영역에 따라 54개 영상과 영상을 차단하지 않은 영상 6개를 추가하여 총 60개의 영상을 무선적으로 피험자에게 제시하였다. 본 연구에서는 실전 상황처럼 생태학적 타당 성을 높이기 위해, 모든 피험자가 펜싱 장비를 착용한 상

Fig. 3. Anticipation accuracy of seven spatial occlusion tasks *Spatial occlusion (H: head, T: torso, FL: front leg, HL: hind leg, W/F: wrist/foil, A/S: arm/shoulder, NO: no-occlusion)

Fig. 4. Comparing anticipation accuracy of each body part with no-occlusion task

Table 1. The change rate of anticipation accuracy comparing with non-occlusion task (Unit : %) Nonocclusion Head Torso Front leg Hind leg Wrist/foil Arm/Shoulder AA AA CR AA CR AA CR AA CR AA CR AA CR Expert 91.67 87.04-4.63 87.04-4.63 87.04-4.63 90.74-0.93 75.9 * -15.74 83.33-8.34 Novice 80.56 79.63-0.93 85.19 4.63 81.48 0.92 75.93-4.63 59.3 * -21.3 70.37-10.19 Mean 86.115 83.34-2.78 86.12 0 84.26-1.86 83.34-2.78 67.6-18.52 76.85-9.265 Fig. 5. Certainty of accuracy in seven spatial occlusion task *Spatial occlusion (H: head, T: torso, FL: front leg, HL: hind leg, W/F: wrist/foil, A/S: arm/shoulder, NO: no-occlusion)

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