Author Topic: Heavy Marijuana Use May Damage Developing Brain In Teens, Young Adults (Read 812 times)

kiamoy · « **on:** February 05, 2009, 01:31:17 AM »

ScienceDaily (Feb. 3, 2009) â€” Adolescents and young adults who are heavy users of marijuana are more likely than non-users to have disrupted brain development, according to a new study. Pediatric researchers found abnormalities in areas of the brain that interconnect brain regions involved in memory, attention, decision-making, language and executive functioning skills. The findings are of particular concern because adolescence is a crucial period for brain development and maturation.

The researchers caution that the study is preliminary and does not demonstrate that marijuana use causes the brain abnormalities. However, "Studies of normal brain development reveal critical areas of the brain that develop during late adolescence, and our study shows that heavy cannabis use is associated with damage in those brain regions," said study leader Manzar Ashtari, Ph.D., director of the Diffusion Image Analysis and Brain Morphometry Laboratory in the Radiology Department of The Children's Hospital of Philadelphia

more=> http://www.sciencedaily.com/releases/2009/02/090202175105.htm

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kiamoy · « **Reply #1 on:** February 05, 2009, 01:38:52 AM »

Marijuana Use Affects Blood Flow In Brain Even After Abstinence

The findings could explain in part the problems with thinking or remembering found in other studies of marijuana users, according to study authors Ronald Herning, PhD, and Jean Lud Cadet, MD, of the National Institute on Drug Abuse in Baltimore, Md.

The study involved 54 marijuana users and 18 control subjects. The marijuana users volunteered to take part in a month-long inpatient program. The blood flow velocity in brain arteries was tested with transcranial Doppler sonography in all participants at the beginning of the study and again at the end of the month for the marijuana users.

The blood flow velocity was significantly higher in the marijuana users than in the control subjects, both at the beginning of the study and after a month of abstinence from marijuana use. The marijuana users also had higher values on the pulsatility index (PI), which measures the amount of resistance to blood flow. This is thought to be due to narrowing of the blood vessels that occurs when the circulation system's ability to regulate itself is impaired.

http://www.sciencedaily.com/releases/2005/02/050211084701.htm

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Author Topic: Heavy Marijuana Use May Damage Developing Brain In Teens, Young Adults (Read 812 times)

kiamoy

Heavy Marijuana Use May Damage Developing Brain In Teens, Young Adults

kiamoy

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