Category Archives: marijuana

Researchers seek answers of brain on (legal) cannabis

For those suffering depression or anxiety, using cannabis for relief may not be the long-term answer.

That’s according to new research from a team at Colorado State University seeking scientific clarity on how cannabis — particularly chronic, heavy use — affects neurological activity, including the processing of emotions. 10501634_10152483771078046_6376046067124349017_n

Researchers led by Lucy Troup, assistant professor in the Department of Psychology, have published a study in PeerJ describing their findings from an in-depth, questionnaire-based analysis of 178 college-aged, legal users of cannabis. Recreational cannabis became legal in Colorado in 2014. Since then, seven other states have enacted legalization for recreational use, while many others allow medical use.

“One thing we wanted to focus on was the significance of Colorado, the first state to legalize recreational cannabis, and its own unique population and use that occurs here,” Troup said.

Through the study, which was based solely upon self-reported use of the drug, the researchers sought to draw correlations between depressive or anxious symptoms and cannabis consumption.

They found that those respondents categorized with subclinical depression, who reported using the drug to treat their depressive symptoms, scored lower on their anxiety symptoms than on their depressive symptoms – so, they were actually more depressed than they were anxious. The same was true for self-reported anxiety sufferers: they were found to be more anxious than they were depressed. MORE HERE

Daily marijuana use has a measurable effect on the brain, a new study finds.

Teenagers who smoked marijuana daily for three years performed poorly on memory tasks and showed abnormal changes in brain structure, according to a Northwestern Medicine study. Researchers in Chicago observed the brains of teenagers who were heavy users of marijuana. In those individuals, memory-related structures in the brain appeared to shrink and collapse inward, possibly indicating a decrease in neurons.

These abnormalities were recorded two years after the teens stopped using marijuana, possibly indicating long-term effects, and look similar to schizophrenia-related brain abnormalities.

The brains were shaped more abnormally for individuals who began marijuana use at a younger age, according to the reports, which suggest that memory regions of the brain are more susceptible to the drug at earlier ages.

The research was published in the December issue of Schizophrenia Bulletin.

Smoking Weed = less Creativity

People sometimes think that smoking cannabis makes them more creative. However, research by Leiden psychologists Lorenza Colzato and Mikael Kowal shows that the opposite is true.

Strong cannabis doesn’t work

The findings show that cannabis with a high concentration of the psychoactive ingredient THC does not improve creativity. Smokers who ingested a low dose of THC, or none at all (they were given a placebo), performed best in the thinking tasks that the test candidates had to carry out. A high dose of THC was actually shown to have a negative effect on the ability to quickly come up with as many solutions as possible to a given problem.

Increased creativity is an illusion18

The research findings contradict the claims of people who say that their thinking changes and becomes more original after smoking a joint. There’s no sign of any increased creativity in their actual performance, according to Colzato. ‘The improved creativity that they believe they experience is an illusion.’

Too much cannabis is counterproductive

Colzato said, ‘If you want to overcome writer’s block or any other creative gap, lighting up a joint isn’t the best solution. Smoking several joints one after the other can even be counterproductive to creative thinking.’

The research method

Colzato and her PhD candidate Kowal were the first researchers to study the effects of cannabis use on creative thinking. For ethical reasons, only cannabis users were selected for this study. The test candidates were divided into three groups of 18. One group was given cannabis with a high THC content (22 mg), the second group was given a low dose (5.5 mg) and the third group was given a placebo. The high dose was equivalent to three joints and the low dose was equal to a single joint. Obviously, none of the test candidates knew what they were being given; the cannabis was administered via a vaporizer. The test candidates then had to carry out cognitive tasks that were testing for two types of creative thinking:

  • Divergent thinking: generating rapid solutions for a given problem, such as: “Think of as many uses as you can for a pen?”
  • Convergent thinking: Finding the only right answer to a question, such as: “What is the link between the words ‘time’, ‘hair’ and ‘stretching’. (The answer is ‘long’.)

Mikael A. Kowal, Arno Hazekamp, Lorenza S. Colzato, Henk van Steenbergen, Nic J. A. van der Wee, Jeffrey Durieux, Meriem Manai, Bernhard Hommel. Cannabis and creativity: highly potent cannabis impairs divergent thinking in regular cannabis users. Psychopharmacology, 2014; DOI: 10.1007/s00213-014-3749-1