脳損傷患者の抹消課題における抹消パターンの定量的分析の試み

A preliminary study of cancellation pattern analysis in cancellation tasks in brain-damaged patients

要旨：脳損傷患者と健常者を対象に，抹消課題における抹消パターンと抹消効率の関連性をMarkら⁵⁾の方法に基づいて定量的に分析した．抹消パターンはタテ型，ヨコ型，不定型の3型に分類することが可能であった，タテ型群，ヨコ型群は高い抹消効率を示した一方で，不定型群の抹消効率は低値に留まった．不定型を示す背景には遂行機能やターゲット検知能力等いくつかの要因の関与が推測された．抹消パターンのような定性的検査所見を定量的に示すことによって，その他の定量的検査指標との関連分析が容易になるものと考えられる．

　We quantitatively analyzed the relationship between the patterns of searched trajectories in cancellation tasks and their efficiency in brain damaged patients and age-matched healthy subjects using the Mark's method (Mark VW, 2004). As is widely known, the searched trajectories were classified into 3 patterns: vertical-type, horizontal-type and mixed-type. Subjects classified as vertical-type and horizontal-type scored much higher in the search efficiency than mixed-type subjects. Several factors such as deficit in executive function or disability to detect targets were suspected of causing the mixed-type patterns. By quantifying a qualitative result, a comparison among quantitative results became possible. We are continuing to analyze the correlations between the results and behavior of brain damaged patients.