The issue focused on a recent study published this week in the journal PLOS ONE. Researchers led by Dr. David L. Smith of Stanford University examined the effects of a drug that blocks the release of acetylcholine into the central nervous system (CNS).

In their study, Smith and co-authors looked into how the drug would affect the brain during a memory test, which involved the recognition of faces and numbers. The memory test, the researchers said, was designed to detect a number of "