抹消試験における誤反応の局性化率と左半側空間無視の評価との関係

Relation between laterality indexes of false reaction in cancellation tests and assessment of unilateral spatial neglect

要旨：抹消試験の誤反応が左側と右側のどちらで多いか判断でき，同時に左右の誤反応率の差も表す局性化率を考案した．そして，この局性化率が左半側空間無視(left unilateral spatial neglect;以下，USN)の評価と関係があるかを調べた．結果，星印抹消試験の局性化率とCatherine Bergego Scale，Behavioral Inattention Test(以下，BIT)通常検査の得点との相関係数は有意で，星印抹消試験の局性化率はBITの得点を予測していた．加えて，局性化率はBITによるUSN有無の判断とも関係する事が示唆された．この事から星印抹消試験の局性化率は，USNの有無を判別する際のスクリーニング検査として役立つと考えられた．

　We developed a laterality index that judges excessive right or left false reactions, and simultaneously expresses a difference of the ratio of the false reactions in the left side and right side. In addition, we investigated whether the index was associated with evaluations of Left side Unilateral Spatial Neglect (USN). As a result, the coefficient of correlation the laterality index of star cancellation test and sore of the Catherine Bergego Scale or conventional test of Behavioral Inattention Test (BIT), and laterality index predicted a BIT score. In addition, the results suggest that the laterality index is associated with judgment of having USN or not by BIT. Therefore, the laterality index of star cancellation test may be helpful as a screening test when we distinguish having USN or not.