与えられた玩具で遊ぶ健常乳幼児の行為にみられる継続性—Nちゃんの生後6ヵ月から生後18ヵ月まで

Continuance of play performance with a given toy exhibited by "N" from six to 18 months old

要旨：健常乳幼児が与えられた玩具で遊ぶ行為の継続性について，携帯電話の玩具を提示された時の生後6〜18ヵ月の“N”の行為を各10分間録画し検証した．電話に何らかの関与がみられる状態（「電話関与」）は，全ての月齢で10分の約1/4〜1/2だったが，1回の「電話関与」は短い継続が多く，長くても30秒〜2分程度の継続が多かった．その平均継続時間は月齢とともに延長する傾向にあった．ある程度継続する「電話関与」には集中した状態が多かったが，継続時間の短い集中を欠く状態も頻回に含まれていた．また「電話関与」が長く続く場合も，操作方法や操作対象は1〜4秒毎に変わることが多かった．“N”の自然な遊びは，かなり断片的なものだった．

　In order to find out distinctive features of continuance of playing behaviors exhibited by a normal infant, "N" was given a toy telephone, and was videotaped for ten minutes every three months, from six to 18 months old.

　The mean length of continuance time of her toy-related behaviors, which were defined as whether the toy was watched, or was in physical contact, showed the tendency to get longer, as N grew up. The features below were found in her behavior at any age. Total time of all toy-related-behaviors formed about one quarter or half of the whole play period. The toy-related behavior was, at longest, 30〜120 seconds, with one exception. Although in the longer toy-related behaviors, the ratio of concentrated time was larger than in the short ones, many short, distracting behaviors were also observed in them. In her toy-related performance, she usually changed her target part of the toy, or her way of working, every 1〜4 seconds. The continuance exhibited by N's toy-related-behavior was proven to be not developed enough, from age 6 to 18 months.