Abstract
Not all environmental changes produce equivalent attending. The present study was concerned with demonstrating the existence of an ordering of attending. A model for testing this was suggested and data gathered concerning the effect of various stimulus changes after stimulus repetition. The results indicated an order of attending, with color, size, number, and rotation changes, in that order, showing the greatest orienting responses. Other data consistent with these results were reported and the argument made that OR orders reflect important differences in cognitive function.
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