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The ability to identify the more frequently occurring category in a random series as a function of coding the categories symbolically (SYM) and/or spatially (SPA), was investigated. In the SYM display, 4 different numbers (1-4) appeared in the same location while in the SPA display the symbol ) O appeared in 4 different locations, and in the SYM + SPA display the numbers 1-4 appeared in 4 different locations. The categories were presented randomly at the rate of 4 per sec. Ss were instructed to indicate the category which appeared most frequently. The results show significantly better performance for the SPA and SYM + SPA displays over the SYM display and no significant difference between the SPA and the SYM + SPA displays. The results are explained in terms of the facilitation of handling externalized physical representations of concepts as opposed to abstract representations. (Author)