The Fontes, et al. (2011) study investigated the impact of cannabis abuse on brain development prior to and subsequent to attaining the age of fifteen years. The authors referred to several scholars who previously investigated these relationships, and they indicate that most of these studies suggest that puberty is a stage of significant exposure to neurocognitive effects that are associated with substance abuse. Longitudinal, as well as cross-sectional structural brain imaging studies have demonstrated that the brain, prior to the reaching fifteen years of age, is under a complicated course of biological development. The motive of the study by Fontes, et al. (2011) was to probe the executive functioning of persons who began chronic abuse of cannabis before attaining the age of fifteen years compared with those who started after attaining the age of fifteen years.
Fontes, et al. (2011) asserts that, while a number of studies have found neuropsychological deficits linked to chronic cannabis exposure, there are study outcomes investigating recurrent cognitive impairments linked to chronic cannabis that show contradictory points of view. Medina et al showed that even after practising abstinence, chronic cannabis addicts may continue to experience considerable neuropsychological deficits. When persons of less than fifteen years of age are exposed to substances that are potentially neurotoxic, they become more liable to develop recurrent neuropsychological deficits in comparison to older persons.
Fontes, et al. (2011) asserts that adolescents are at risk of defective cognitive effects related to the abuse of cannabis. Puberty is a stage in which the brain seems to be defenceless to the neurotoxic impact of cannabis. Results from diverse studies imply that chronic cannabis addicts process complicated information significantly slowly, while performance deteriorates in cognitive overload responsibilities as lifetime use increases. It is in this context that Fontes, et al. (2011) investigated the effect on executive functioning among 104 chronic cannabis addicts. While focusing on executive functioning, the group was divided in two sets, where 49 individuals were chronic users in the early-onset category and 55 individuals, late-onset chronic users, as well as 44 healthy controls that carried out neuropsychological responsibilities. The control cluster concerned individuals who had not abused cannabis in the previous three months, and less than five instances across their lifetime. These chronic users of cannabis were initially under care at the Substance Use Disorder Program, Federal University of Sao Paulo.
In the study, Fontes, et al. (2011) held the hypothesis that the early-onset group (prior to 15 years of age) was likely to exhibit poor performance in cognitive tests that evaluate executive functioning, in comparison to the late-onset group, and the healthy controls. The inclusion criteria employed for chronic users of cannabis was males and females, between eighteen and fifty-five years of age, exhibiting cannabis abuse or addiction. The criteria for exclusion entailed present record of other disorders, excluding nicotine-related disorders; present usage of psychoactive drugs, record of head trauma with seizures for above five minutes, intellectual incapacity or approximate IQ less than 80, as well as irreparable hearing, vision or injury. Persons in the control group were eligible for the study on condition that they were between eighteen and fifty-five years of age, and did not abuse psychoactive substances, did not hold a record of head trauma, and never diagnosed with any disorder in their lifetime. The study’s protocol was approved by the local institutional review board, while the respondents were obliged to consent in writing, in line with the Federal University of Sao Paulo review board.
The study findings point out that the early onset cohort are cognitively impaired in relation to controls, implying that early use of cannabis is linked to the negative impact on the brain. These outcomes correspond to past research that explored cognitive effects linked to early exposure to cannabis. The study did not establish differences in executive functioningperformance between the late-onset cohort and the healthy cohort.
In conclusion, the study findings imply that early-onset chronic users of cannabis but not display executive deficits, while the contrary is the case in the late-onset group. While the fundamental mechanisms may not be entirely understood, it is apparent that exposure to cannabis at an early age might hold more significant negative impact on neurocognitive functioning.