Effects of menstrual cycle on spatial information-processes

The present study examined effects of menstrual cycle (i.e., ovulatory vs menstrual phase) on performance on spatial information-processes. Participants included 20 spontaneously cycling women (with regular 28- to 30-day menstrual cycles) who were tested on a reaction-time task developed to assess specific spatial information-processes and the Spatial Relations subtest of the PMA battery. For the spatial information-processing task, women responded faster and applied relatively less stringent criteria in the decision process during the ovulatory phase. No effects of cycle changes were found for accuracy of performance on either of the spatial tasks. It is suggested that studies examining effects of menstrual cycle on spatial ability consider an information-processing approach in measuring spatial performance and an application of signal-detection theory to separate components (strategy vs aptitude) of problem solving.