1988 Volume 6 Issue 2 Pages 79-88
This study was undertaken to find out (1) what operations one had to carry out beforehand for successful actual drawing of the geometric figures, and (2) what kinds of tasks were useful to get such operations. We set two experiments so that Sub. T (CA 5:6, PIQ 52, VIQ 112, PQ 67) might draw an oblique line and a triangle successfully. The results showed that the operation we originally named "tentative drawing", a trial drawing with a forefinger or eye movement, was requisite before actual drawing with the general instrument like a pen. It was then suggested that "tentative drawing" enabled him to anticipate the result of actual drawing as well as to avoid the error drawing in advance. In addition, this "tentative drawing" was acquired through the "ball task" which required to draw the slope on which a ball would roll down into the glass. This fact suggested that the manner of figure drawing was come into his mind and then established in advance by imaging the movement of a rolling ball along the slope in the "ball task".
