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Imaging technique sheds new light on the composition of the brain of moderate cannabis users
May 08, 2006Diffusion tensor imaging, a newly developed magnetic resonance imaging technique, could enable researchers to gain a better understanding of the effects of cannabis on the brain. In a preliminary study published today in the open access journal Harm Reduction Journal, researchers used diffusion tensor imaging to compare the brain tissue of young people who had used cannabis moderately as teenagers and young people who had not. The researchers failed to find any indication that damage to the developing adolescent brain occurred.
Lynn DeLisi and colleagues from the Nathan S. Kline Institute for Psychiatric Research and New York University School of Medicine used diffusion tensor imaging (DTI) to scan the brain of 10 young people who had smoked cannabis during adolescence. The participants were between 17 and 30 years old, they had smoked at least two to three times a week for one or more years during adolescence and had no personal or family history of mental health problems. They were matched for sex, age and social class of parents with 10 controls who had not smoked cannabis regularly as teenagers.
DTI is a magnetic resonance imaging (MRI) technique that enables a detailed look at the organisation of nerves in the brain and the measurement of brain volume.
DeLisi and her colleagues found no significant differences in brain integrity and brain volume between cannabis smokers and non-smokers. This preliminary study suggests that moderate cannabis use has no direct adverse effects on brain structure and integrity. The authors warn however, that more research is necessary, both in a larger group of people and to see the effects of heavier use.
BioMed Central
DeLisi and her colleagues found no significant differences in brain integrity and brain volume between cannabis smokers and non-smokers. This preliminary study suggests that moderate cannabis use has no direct adverse effects on brain structure and integrity. The authors warn however, that more research is necessary, both in a larger group of people and to see the effects of heavier use.
BioMed Central
Cannabis Current Events and Cannabis News RSSSmoking during pregnancy puts children at risk of psychotic symptoms
Mothers who smoke during pregnancy put their children at greater risk of developing psychotic symptoms in their teenage years.
Weeding out marijuana: Researchers close in on engineering recognizable, drug-free Cannabis plant
In a first step toward engineering a drug-free Cannabis plant for hemp fiber and oil, University of Minnesota researchers have identified genes producing tetrahydrocannabinol (THC), the psychoactive substance in marijuana. Studying the genes could also lead to new and better drugs for pain, nausea and other conditions.
Impact of cannabis on bones changes with age, study finds
Scientists investigating the effects of cannabis on bone health have found that its impact varies dramatically with age.
Government-backed youth program pilot didn't reduce teenage pregnancies
A government-backed youth development pilot programme in England, aimed at reducing teenage pregnancies, drunkenness or cannabis use, didn't reduce teenage pregnancies and other outcomes and might have increased pregnancies.
'Cannabis alters human DNA' -- new study
A new study published by University of Leicester researchers has found "convincing evidence" that cannabis smoke damages DNA in ways that could potentially increase the risk of cancer development in humans.
Hollow mask illusion fails to fool schizophrenia patients
Patients with schizophrenia are able to correctly see through an illusion known as the 'hollow mask' illusion, probably because their brain disconnects 'what the eyes see' from what 'the brain thinks it is seeing'.
A severe vomiting sickness with chronic cannabis abuse
This obscure clinical manifestation of severe vomiting sickness due to chronic abuse of marijuana, recognized by Dr. Sontineni and his colleagues at the Creighton University of Omaha, NE.
Study finds cannabis use, dangerous driving behaviors interrelated
Thrill-seeking young men are more likely to drive under the influence of cannabis (DUIC) and engage in reckless driving, according to a new Université de Montréal study. As reported in the journal Accident Analysis and Prevention, men who are sensation-seekers, an average age of 27 and impulsive will consider taking the wheel after consuming cannabis more often than older peers.
Heavy marijuana use may damage developing brain in teens, young adults
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.
Adolescent insomnia linked to depression and substance abuse during adolescence and young adulthood
A study in the Oct. 1 issue of the journal Sleep shows that adolescent insomnia symptoms are associated with depression, suicide ideation and attempts, and the use of alcohol, cannabis and other drugs such as cocaine.
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