11.   He is now undergoing tests to determine whether his brain has been affected by the sudden detachment from the technology.

12.   He was showing signs of it affecting his brain.

13.   Hormones affecting our brains also are at work.

14.   Nicotine affects the brain, body and behavior, including changing heart rate, intestinal action, endocrine functions, brain waves and general arousal, the research found.

15.   Nobody could determine just how the drug affected the brain.

16.   Or a stroke affects the brain and the victim does not recognize the symptoms.

17.   Scientists in research centers around the country are studying how drugs affect the brain.

18.   Scientists have long suspected such a link, based on their work on how children learn to read and on how estrogen affects the brain.

19.   Since the appetite suppressant fenfluramine is chemically related to MDMA, scientists are concerned that it may affect the brain in similar ways.

20.   Some opportunistic infections, like toxoplasmosis and cryptococcal meningitis, affect the brain.