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The purpose of this paper is to test whether one to two year old children can learn to discriminate the length of line segments or not and, if they can, to investigate how accurately they can discriminate. As to the discrimination of line length, it is well known that human adults can discriminate it accurately and that the Weber's ratio is about 1/100 (Frobes, 1923; Obonai, 1955). In addition, developmental studies show that children aged six years can discriminate it as well as adults (Frobes, 1923). However, there are few experimental studies which investigate how early children can discriminate the length of line segments. It is important to investigate whether or not young children are able to learn to discriminate line length. In addition, to investigate the basic processes of the discrimination of line length, it is desirable to examine the discriminative behaviors of young children, because it is expectedly impossible for young children to use various figural cues in the discrimination of length, although adults can use them (Umezu, 1938). Umezu (1935), using congenitally blind adults and sighted adults as subjects, studied the effects of the spatial arrangements on the estimation of line length. In his study, subjects were asked to reproduce freely the sample line length by their finger movements at the same place as the sample line segment or at other places. He found that the performance of the congenitally blind fluctuated more than that of the sighted who saw the stimuli in the estimation of line length and whose estimation of line length varied according to the spatial arrangements of two lines. This indicates that the spatial arrangements of lines play an important role in the discrimination of line length. However, Umezu failed to analyze further the effects of the spatial arrangements of lines. Therefore, the present research 1 The author wishes to express gratitude to Prof.

Discrimination of line length by one to two year old children