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　　Many of us spend lots of time tapping out words ona keyboard.

　　Now a team of M.I.T. researchers thinks that how wetype might reveal hidden information about thestate of our brains.

　　They designed a study in which a computer coulddetect which subjects were alert and which werefatigued, just from their typing.

　　The researchers focused on how long any particular key was depressed.

　　They designed a program to evaluate the keystrokes, and ignore the actual content beingtyped.

　　For the study, 14 volunteers, seven women and seven men, had to type a Wikipedia articlewhen they were fully alert.

　　Then they were woken up about 70 to 80 minutes after they'd fallen asleep, when they were indeep slumber.

　　They then had to type out another article while still drowsy.

　　The result: how long they held down the keys varied much more when they were sleepy thanwhen they were alert.

　　The research will be published in the journal Scientific Letters.

　　In their write up the team says that such a system could be useful as a safety feature onsoftware programs for night shifts, to identify users who have become incapacitated bysleepiness.

　　A variation on the program could help diagnose or monitor neurodegenerative diseases suchas Parkinson's by tracking changes in someone's ability to manipulate the common keyboard.