Health

Cannabis use linked to cognitive abnormalities, impairments in working memory: study

ANI | May 26, 2019 06:49 PM
Representative image

Washington [USA], May 26 (ANI): New researches by Canadian neuroscientists have revealed that cannabis use affects the brain of adolescents and is linked to cognitive abnormalities, impairments in working memory, and inhibitory control.

The research was presented by neuroscientists Patricia Conrod, Steven Laviolette, Iris Balodis and Jibran Khokhar at the '13th Annual Canadian Neuroscience Meeting'.

Dr Patricia Conrod, Universite de Montreal, studied the year-to-year changes in alcohol and cannabis use and cognitive function in a sample of adolescents consisting of five per cent of all students entering high school in 2012 and 2013.

The students were assessed annually for four years on alcohol and cannabis use, and their cognitive function was evaluated using computerised cognitive tests.

According to the study, cannabis use was linked to impairments in working memory and inhibitory control, which is required for self-control. Cannabis use was also linked to deficits in memory recall and perceptual reasoning.

Dr Steven Laviolette team demonstrated that adolescent exposure to tetrahydrocannabinol or THC induces changes in a specific region of the brain called the prefrontal cortex (PFC) and in a brain circuit, the mesolimbic pathway, that closely resemble the abnormalities observed in schizophrenia.

Furthermore, adolescent THC exposure also caused cognitive abnormalities including deficits in social interactions, memory processing and anxiety regulation.

Interestingly, Dr Laviolette's team found that administration of drugs that restore normal PFC function in early adulthood could reverse the effects of adolescent THC exposure.

They also demonstrated that co-administering THC with drugs that prevent the THC-induced disruption in brain signalling pathways prevented the development of schizophrenia-like effects.

Dr Iris Balodis, McMaster University, investigated the mechanisms that motivate individuals to act and make decisions that can go against a person's best interest, as seen in people suffering from addiction.

To compare decision-making in individuals suffering from cannabis addiction (also called cannabis use disorder) to healthy controls, Dr Balodis used an effort-based decision-making test, which explored how much effort an individual is willing to make to receive a given reward.

Participants were given a choice between an easy task or a hard task in which they can gain varying amounts of money. During the administration of this test, Dr Balodis and her team looked at differences in activity in different brain regions by functional magnetic resonance imaging.

Initial findings suggested that there are differences in encoding the value of the reward (money received) and of the effort cost (amount of work done) in individuals addicted to cannabis relative to healthy controls. These were revealed by differences in the activation of specific brain regions known to be important for motivation. This information could be key to finding cannabis addiction vulnerability factors.

Adolescent cannabis use is associated with behavioural changes related to reward and motivation in humans. Paradoxically, this use has both been suggested to increase motivation for other drug use (the gateway hypothesis) and a potential "amotivation syndrome" in which individuals are less willing to expend effort to receive a reward.

Taken together, the research help decipher the links between cannabis use and long-lasting changes in the brain, which underlie changes in behaviour in adolescent humans, and in studies reverse-translating these findings to animal models. (ANI)

Have something to say? Post your comment
Must Read
AAP legislators meet ailing Brahmpura at PGI, wish him speedy recovery
AAP legislators meet ailing Brahmpura at PGI, wish him speedy recovery
2nd International Conference of Pharmacy: MRSPTU Research scholar shine by winning best research prize on malaria disease
2nd International Conference of Pharmacy: MRSPTU Research scholar shine by winning best research prize on malaria disease
Rana Gurmit Singh Sodhi flags off 4th Shivalik Hill Drive Car rally
Rana Gurmit Singh Sodhi flags off 4th Shivalik Hill Drive Car rally
Govt should resolve sheller owners’ issue soon to save farmers' from being ‘fleeced’ by ‘mandi’ mafia: Bhagwant Mann
Govt should resolve sheller owners’ issue soon to save farmers' from being ‘fleeced’ by ‘mandi’ mafia: Bhagwant Mann
EC announces schedule of bypolls for Phagwara, Mukerian, Dakha and Jalalabad constituencies
EC announces schedule of bypolls for Phagwara, Mukerian, Dakha and Jalalabad constituencies
Anti-larva teams detect 15 cases of dengue larva in city
Anti-larva teams detect 15 cases of dengue larva in city
EC asks parties not to use plastic, polythene  in poll material
EC asks parties not to use plastic, polythene in poll material
Get 10 Arm license services through e-Sewa
Get 10 Arm license services through e-Sewa
Thousands of crores would be saved through reverse tendering of projects bidded under TDP regime: AP Irrigation Minister
Thousands of crores would be saved through reverse tendering of projects bidded under TDP regime: AP Irrigation Minister
By-elections for 1 LS, 64 Assembly to be held  on Oct 21
By-elections for 1 LS, 64 Assembly to be held on Oct 21
Hrithik and Tiger dance face off in 'Jai Jai Shivshankar' from 'War' will leave you spellbound!
Hrithik and Tiger dance face off in 'Jai Jai Shivshankar' from 'War' will leave you spellbound!
Navratri celebrations in Rajkot: Craftsmen portray message of united India and Article 370 through art
Navratri celebrations in Rajkot: Craftsmen portray message of united India and Article 370 through art