健常者に, 3種の教示条件下で, 口腔器官のディアドコキネシス検査を施行し, 教示方法の違いが, 被験者の課題遂行に及ぼす影響を検討した。対象は, 健常女性31名(平均19.4歳)である。教示は, 音節/pa/, /ta/, /ka/を, (1)できるだけ速く, 5秒間くり返し言う, (2)できるだけ速く, 一息で続く限り長く, くり返し言う, (3)正確に, できるだけ速く, 一息で続く限り長く, くり返し言うの3条件を設定した。その結果, (1)構音の正確さを強調した教示方法では, 強調しない方法に比べ, 口腔器官の交互反復運動速度は有意に低下した。(2)最初の5秒間について, 秒毎に平均音節数を算出すると, 音節/pa/および/ka/の場合には1秒目に比べて, 3秒目もしくは5秒目の音節数が有意に減少しており, 交互反復運動速度に時間的変動がみられた。これに対して音節/ta/では, 音節数に有意な差は認められなかった。(3)交互反復運動速度は, どの教示条件においても.音節/ta/で最も速く, 次いで/pa/, /ka/の順であった。

We examined the maximum performance rate of single syllable repetitions (oral diadochokinesis) in normal subjects. The subjects were 31 females with a mean age of 19.4 years. The task consisted of three different types of instructions : the repetition of monosyllable (/pa/, /ta/, /ka/) (1) as rapidly as possible for five seconds, (2) as rapidly and as long as possible in one breath, or (3) as rapidly and as long as possible, but accurately, in one breath. The results revealed the following. (1) With the instruction requiring articulatory accuracy (condition 3) alternating motion rates (AMR's) were significantly slower than those under the other conditions. (2) The number of syllables in the third or fifth second showed a significant reduction as compared to the first second in the articulations of /pa/ and /ka/. However, the numbers in each of the first five seconds were constant for /ta/. (3) The AMR's were different for each type of syllable produced. Of the three syllables, the AMR's for /ta/ were the fastest.

国立情報学研究所で電子化