Abstract
An experiment is introduced in which subjects had to mark with either an “X” or a point 100 squares arranged in a 10 by 10 matrix randomly. One group of subjects had to proceed horizontally (starting with the top row, left to right), another group vertically (starring with the left-most column, top to bottom). Two forms of repetition avoidance were found, temporal (avoidance of preceding choice) and spatial (avoidance of the mark contained by the neighboring cell, i.e., the one above or the one to the left for the horizontal and vertical procedures, respectively). Selection of a “random” choice in a two-dimensional array is thus affected by internal (self-generated) as well as external stimuli. The two forms of avoidance were negatively intercorrelated, indicating that suppression of internal and external cues are separate and mutually competing functions. Random matrix tasks may provide a simple means to assess a person's relative susceptibility to either form of repetition avoidance.
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