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語想起課題は,一定の時間内で特定のカテゴリーに属する語をどれだけ多く産生できるかをみる検査であるが,健常者の成績についての研究は少ない.本研究では健常者の語想起課題におけるカテゴリー内の項目による語産生数,課題成績への年齢,性別の影響,産生語の内容について検討した.
健常高齢者および若齢者を対象とし,「あ」「か」「動物」「野菜」を用いて語想起課題を行った.その結果,語想起課題では①健常者の語産生数のばらつきの幅は大きく,語産生数が非常に少ない者がいること,②加齢により語産生数は低下すること,③加齢により既に産生した語の繰り返しの数は増加すること,④条件に不適合な語の産生は加齢では認められないこと,⑤項目により性別で語産生数に差がみられることが示された.
The verbal fluency test is a neuropsychological test which measures the number of words within a specific category produced in a limited time;there are few studies about the performance of normal subjects on verbal fluency tasks in Japanese. Normal subjects were tested for the effects of age, gender, and other specific criteria on the number of words produced during verbal fluency tasks. Tasks requiring words with initial letters 'a' and 'ka', and words belonging to the categories of 'animals' and 'vegetables', were administered to adults of two age groups. The results suggest that:1) There is a considerable score variability within the subjects, and some obtained very low scores;2) The total number of words produced decreases with age;3) Repetitive errors increase with age;4) Rule violations, such as intrusion errors, are not produced in normal subjects;and 5) Gender effects are found for certain criteria.
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