The purpose of the investigation was to examine the effect of stimulus verbalization on the performance of multicative classification tasks, using5, 6, and 8 year-old children.
Two experiments were designed.
In Exp. I, the subjects were presented with a series of 10 2 X 2 matrices consisting of values from 2 dimensions of color, form, size, and number, and were required to complete the empty cell of the matrix with the relevant stimulus. The basic design was a 2 (verbalization or perceptual identification to the stimuli of matrix) X 2 (verbal response or perceptual selection from alternatives for empty cell) X 3 (age levels of 5, 6, and 8 year-old) factorial, resulting in four treatment conditions for each age level.
In Exp. II, 6 year-old children who could not solve multicative classification problems were train ed on two different training conditions. In one tr aining condition, the subjects were demanded the verbalization of matrix elements for the dimensional value as in Exp. I, and they received visual feedback of a correct stimulus, i. e., verbal training, while in another training the subjects were only shown th e visual feedback of the correct stimulus, i. e., nonverbal training. After reaching the learning criteri on, the transfer effects of the training on the two kinds of new matrices were examined.
The results were as follows:
In Exp. I, the performance level of multicative classification tasks showed that it signific antly improved with age. The effects of 2 variables on task performance, however, were found solely in 6 yearold children ; while 8 year-old children showed high level of performance in all conditions, 5 year-old children did low level of performance. For 6 year-old children, verbalization and verbal response to matrices element facilitated the performance of tasks. As regards this result, the effect on the task performance increased more when the condition of stimulus verbalization was associated to that of the verbal response condition. In addition, for the groups of stimulus verbalization, the pattern of error and response justification differed from other groups.
In Exp. II, the group of verbal training reached the learning criterion significantly faster than the group of nonverbal training. As to the effects of the training on the transfer tasks, the verbal training condition facilitated significantly the performance of both kinds of transfer tasks more than the non verbal training condition, particularly to the matrices consisting of new stimuli, while nonverbal training facilitated solely the transfer tasks consisting of the same stimulus elements as those used in the training session.
In view of the results described above, the role of verbal stimuli in the processes of solving multicative classification task was discussed.
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