Abstract
Immediate memory spans of 82 students were measured through the recall of digit sequences and dot-in-matrix patterns. The reliabilities of both spans were very high, while the correlation between the spans was low (r=.209). In addition, the same subjects were given eight kinds of cognitive tasks (Word Relation, Maze, Addition, Shape Series, Anagram, Space Relation, Number Series, and Mental Rotation) selected from intelligence tests. The two spans were correlated with the performance of each task in different degrees. Results of the factor analysis showed that the digit span had a high loading value on the “verbal” factor, while the span with dot patterns loaded the “visuospatial” factor. It is suggested that the capacities of those verbal and visual immediate memory are independent to each other from the point of view of individual difference, and that they have distinct roles in problem solving.