Scientists have long known that changes in a woman's hormone levels during her menstrual cycle can affect her mood. Now a controversial new study, presented last week at a Toronto meeting of the Society for Neuroscience, suggests that a woman's skill at performing some everyday tasks could be influenced by the time of the month.
During the menstrual cycle, the blood level of estrogen, a female sex hormone, rises sharply before ovulation, about midway in the cycle, and then drops again before menstruation occurs. In a study of 200 women, Doreen Kimura, a University of Western Ontario psychology professor, found that...
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