Some artifactual causes of perceptual primacy.

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Abstract
Columns of 10 filled and unfilled circles bisected by a fixation cross were exposed tachistoscopically for .13 sec. Prior to each exposure each S [subject] was told to reproduce the pattern either from top to bottom, fom bottom to top, from center out, or was given an option. On 1/2 of the trials a "fixation forcer" was used in an attempt to restrict eye movements occurring prior to or during target exposure. The results revealed no difference in accuracy of perception between the north and south hemifields when order of report and preexposure set were controlled, and suggested that the fixation forcer did restrict eye movements. A "post exposure process" is not needed, therefore, to account for previous findings of north hemlfield primacy. A replication of the experiment but with horizontal exposures and recording sequences supported the same conclusions with respect to primacy in the left hemlfield.

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