=+for six weeks. The 115 participants assigned to the control group took a placebo pill three times a day for six weeks.

At the end of six weeks, the Wechsler Memory Scale (a test of short-term memory) was administered. Higher scores indicate better memory function. Summary values are given in the following table.

n s Ginkgo 104 5.6 .6 Placebo 115 5.5 .6