in partial fulfil]ment of the - MSpace - University of Manitoba

9.3.3 Experirnent iII
82
Five children between the ages of 7 and
ment IIi. These 5 children were sons (3)
fessors in the Faculty of Human Ecology.
1O-Second Test were used, and the testing
conditions were the same as those described
10 were involved in experiand
daughters Q) of pro-
Both Thornton's RDAT and
procedures and the standard
in experimenL I.
9 "
3 .4 Exper iment ÏV
The participants in this experiment were five children under the age
of 5 from the Child Development Center of the Faculty of Human Ecology.
None of the five children had any history of eye disease. À slightly
modified '10-second ?est was used. The testing procedure involved picking
out a candy wrapped in a white piece of paper under a standardized
dim-light condition.
Four circular white candies, three of thern wrapped in brown pieces of
paper and the remaining one (the test object) was wrapped in a white
piece of paper, were mounted on a prate covered with a black nonreflective
cloth. For the brown wrapping paper, the hue, chroma and
value were 2.5 YR, 6, and 4, respectively. Each subject was light
adapted for one minute. Then the lighting was dimmed to 0.087 u watt
and the subject started to pick out the candy wrapped in a white piece
of paper. Three trials were made by each subject and the times taken to
identify the candy were recorded. In Thornton's (1977) noer, red and
blue discs reflecting the same light energy were used, since the RDÀT
was based on differences in percepÈíon of the peak wave lengths of colours
(red and blue discs). In the 10-second Test, however, since it was