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Simulated flying performance after marihuana intoxication.

D S Janowsky, M P Meacham, J D Blaine

Aviation, Space, and Environmental Medicine

|February 1, 1976

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Marijuana significantly impairs pilot performance, causing more errors in flight simulations. These cognitive effects of cannabis last for several hours after use.

Area of Science:

Aviation Psychology
Pharmacology

Background:

Assessing the impact of psychoactive substances on complex psychomotor tasks is crucial for safety.
Understanding the duration of cognitive impairment from cannabis is essential for operational readiness.

Purpose of the Study:

To evaluate the effects of a social dose of marijuana on pilot performance in a flight simulator.
To determine the time course of cognitive and performance decrements following marijuana administration.

Main Methods:

Ten pilots participated in a double-blind, placebo-controlled study.
Participants flew a specific sequence on an ATC-510 flight simulator after receiving either marijuana or a placebo.
Performance was assessed by tracking errors in major/minor tasks, altitude, heading, and radio navigation.

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Main Results:

Marijuana significantly worsened overall flying performance compared to placebo.
Increased errors were observed in major errors, minor errors, altitude deviations, heading deviations, and radio navigation.
Performance decrements persisted for at least 2 hours and generally resolved within 4 to 6 hours.

Conclusions:

Even a social dose of marijuana can severely impair critical aviation skills.
The duration of impairment necessitates caution regarding flight operations after cannabis use.
Further research should explore dose-dependent effects and individual variability in response.