Ss were administered Parts 9 and 10 of the GATB routinely as part of the test battery. 111 Ss used plastic apparatus boards and plastic pegs, while 128 used wooden apparatus boards and wooden pegs. Ss using wooden boards performed significantly better than Ss using plastic boards. Differences in performance were attributed to coarser texture of wooden pegs, heavier, more stable wooden boards, and a slight wearing at the edges of the wooden pegs and holes in contrast to the sharp edges on the plastic pegs.
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