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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Longitudinal Studies01:26

Longitudinal Studies

Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
Stress and Mental Health01:30

Stress and Mental Health

Chronic stress profoundly affects mental health, significantly influencing mood, behavior, and overall quality of life. Research closely links chronic stress with mental health conditions such as depression, anxiety, and substance use disorders. Ongoing exposure to stress can lead to physiological and psychological changes, initiating a cycle of emotional distress and maladaptive coping mechanisms.
Individuals with depression often experience challenges in both their personal and professional...
Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
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Long-term Depression01:05

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Psychological and Sociocultural Causes of Schizophrenia01:29

Psychological and Sociocultural Causes of Schizophrenia

Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...

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Updated: Jun 18, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
07:30

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Published on: August 18, 2020

Cannabis and suicide: longitudinal study.

Ceri Price1, Tomas Hemmingsson, Glyn Lewis

  • 1Department of Psychological Medicine, School of Medicine, Cardiff University, Heath Park, Cardiff CF14 4XN, UK.

The British Journal of Psychiatry : the Journal of Mental Science
|December 2, 2009
PubMed
Summary
This summary is machine-generated.

Cannabis use showed an initial association with suicide risk in a large longitudinal study. However, this link disappeared after accounting for psychological and behavioral issues, suggesting cannabis is unlikely to directly increase suicide risk.

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Area of Science:

  • Psychiatry
  • Epidemiology
  • Addiction Medicine

Background:

  • Existing research suggests a link between cannabis use and suicidal ideation.
  • No prior longitudinal studies have specifically investigated completed suicide as an outcome of cannabis use.

Purpose of the Study:

  • To investigate the association between cannabis consumption and completed suicide.
  • To determine if cannabis use is a risk factor for suicide mortality.

Main Methods:

  • A longitudinal study followed 50,087 Swedish men for 33 years.
  • Cannabis use was assessed non-anonymously during military conscription.
  • Suicide data was obtained from the National Cause of Death Register.

Main Results:

  • A crude analysis indicated an increased suicide risk for cannabis users (OR 1.62).
  • After adjusting for confounding factors, the association between cannabis use and suicide was no longer significant (aOR 0.88).
  • The initial association was attributed to underlying psychological and behavioral problems.

Conclusions:

  • The observed association between cannabis use and suicide was explained by confounding variables.
  • Cannabis use appears to have a minimal direct impact on the risk of completed suicide.
  • The findings suggest that psychological and behavioral issues, rather than cannabis itself, may be linked to suicide risk.