Spatial direction and grammatical form of instructions affect the solution of spatial problems.

One hundred and forty-eight undergraduate women were orally instructed to repeatedly and quickly draw circles in spatial relation to squares printed on sheets of paper. On each trial, the instructions required the circle to be drawn either above, below, to the right of, or to the left of the square. The instructions were expressed so that the circle was either the logical subject (e.g., "circle above square") or the logical object (e.g., "square below circle") of the statement. Each subject received all experimental conditions for a total of 24 separate drawings per subject. Analysis of variance of the total number of errors disclosed significant effects of all experimental variables. Performance was significantly more accurate when the circle was the logical subject, when the orientations were "above" and "right of" rather than "below" and "left of" and for the vertical dimension. The results are discussed in terms of current theories on "asymmetries" in information processing.