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Psychosurgery01:30

Psychosurgery

Psychosurgery, the surgical alteration or permanent removal of brain tissue to alleviate severe psychological conditions, stands as one of the most radical and controversial treatments in the history of mental health care. Its development and application have evolved significantly, marked by dramatic shifts in scientific understanding and ethical perspectives.
Historical Development of Psychosurgery
In the 1930s, Portuguese neurologist Antonio Egas Moniz introduced a surgical procedure designed...
Unusual Results01:16

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Unusual results are those that have a very low chance of occurring. Unusual results can be identified using probabilities and the range rule of thumb. In problems involving probability, unusual results can be observed in 2 instances – an unusually high number of successes or an unusually low number of successes.
According to the range rule of thumb, any value above or below two standard deviations, 2σ  from the mean, μ  is considered unusual.
Maximum unusual value = μ + 2σ
Minimum unusual value...
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When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
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The Stanford Prison Experiment03:20

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Related Experiment Video

Updated: Jul 3, 2026

Setup and Execution of the Rapid Cycle Deliberate Practice Death Notification Curriculum
04:36

Setup and Execution of the Rapid Cycle Deliberate Practice Death Notification Curriculum

Published on: August 5, 2020

Unusual suicide with a chainsaw.

Gilles Tournel1, Fabrice Dédouit, Axelle Balgairies

  • 1Faculté de Médecine de Lille, Institut de Médecine Légale et Sociale, 59045 Lille Cedex, France. gilles.tournel@univ-lille2.fr

Journal of Forensic Sciences
|July 16, 2008
PubMed
Summary

This case study details a suicide using a chainsaw, resulting in cervical spine transection. The study reviews chainsaw suicide mechanisms and analyzes bone and tissue damage patterns.

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Last Updated: Jul 3, 2026

Setup and Execution of the Rapid Cycle Deliberate Practice Death Notification Curriculum
04:36

Setup and Execution of the Rapid Cycle Deliberate Practice Death Notification Curriculum

Published on: August 5, 2020

Area of Science:

  • Forensic Pathology
  • Medical Toxicology

Background:

  • Schizophrenia is a severe mental disorder associated with increased suicide risk.
  • Suicide methods vary, and unusual instruments are sometimes employed.

Observation:

  • A case of suicide involving a chainsaw is presented.
  • The method resulted in transection of the cervical spine and spinal cord.
  • The individual suffered from schizophrenia.

Findings:

  • Analysis of bone sections and correlation between anatomical lesions and chainsaw characteristics.
  • Comparison of organ and soft tissue damage based on chainsaw type.
  • Review of the mechanism of suicide using a chainsaw.

Implications:

  • Understanding unusual suicide methods aids forensic investigations.
  • The study highlights the importance of considering diverse mechanisms in forensic pathology.
  • Findings may inform suicide prevention strategies by understanding method characteristics.