本研究是以個案研究方式，探討出現機率極低的不同慣用手同卵雙胞胎學生，在手眼協調選擇反應能力、手部動作協調能力、手部穩定控制能力、空間認知協調能力、型態辨識組合能力、手部運動覺能力等能力上的差異情形；並希望透過質的研究，來了解不同慣用手者間有那些有待了解的問題，以供後續量的研究做參考。本研究以一對具有相同遺傳基因，且生活在同一環境及條件下的同卵女雙胞胎學生（14歲）為個案研究對象。本研究為易於描述起見，以下將慣用左手者以A記號代之，而慣用右手者以B代之。研究結果如下： (一)A的手眼協調選擇反應能力較B為優，且A非慣用(右手)之手眼協調選擇反應能力優於慣用手(左手)。 (二)B在簡單動作之手部動作協調能力較A為優；而A在複雜動作之手部協調動作能力則優於B。 (三)除了B慣用手在螺旋型的手部穩定協調能力優於A外；其餘的均呈現出A優於B。 (四)A在慣用手的空間認知協調能力較B為優；在非慣用手方面則無太大的差異。 (五)A在型態辨識組合的認知能力上優於B。 (六)B的手部運動覺能力較A為。 本研究之結論為：左手慣用手者在手眼協調能力方面優於右手慣用手者，因此，不同慣用手者就某些運動項目而言，可做為運動選材的參考指標之一。

The purpose of this case study was to compare between different hand preference on hand-eye coordination cognitive reaction ability, hand motion coordination ability, hand stable control ability, spatial cognition ability, form recognition matching ability and hand kinesthetic ability. Subjects were one pair of 14-uears-old female twins that were raised in the same family but with different hand preference. The findings were (1) Left-hander was superior to right-hander in hand-eye coordination cognitive reaction ability. (2) In hand motion coordination ability, right-hander was superior to left-hander in simple movement, and left-hander was superior to right-hander in complex movement. (3) Left hander almost better than right-hander in hand stable control ability, except in completing spiral with dominant hand. (4) In spatial cognition ability, left-hander was superior to right –hander in dominant hand, there were no differ from twin in non-dominant hand. (5) Left-hander was superior to right-hander in form recognition matching ability. (6) Right-hander was superior to left-hander in hand kinesthetic ability. The finding suggestion that hand preference could be one of the parameter of sports talent identification.