The researchers examined the usefulness of computer and iPhone tasks in assessing cannabis-impairment in a controlled laboratory environment.
A new app designed by scientists lets cannabis users check how high they are.
Researchers developed a prototype called Am I Stoned which helps cannabis users understand how the drug is affecting them through a series of tasks.
They asked 24 healthy participants, who did not use cannabis daily, to take a pill containing either a placebo or up to 15 milligrams of tetrahydrocannabinol (THC), the ingredient in cannabis that makes people high.
The app Am I Stoned helps cannabis users understand how the drug is affecting them through a series of tasks
Neither the participants nor the researchers knew who received the placebo and who received THC, but the study showed that users were generally aware of their impairment.
In the study, experts successfully detected impairments from THC using three of the four computer tasks and one iPhone task.
Harriet de Wit, professor in the Department of Psychiatry and Behavioral Neuroscience at the University of Chicago, lead the research for the app, which aims to improve drug safety.
Dr de Wit said: ‘One of our long-term goals is for the app to improve the safety of cannabis use by making individual users more aware of their impairment.
‘By gathering data from users in the field, the app will also contribute to the overall scientific knowledge in terms of how cannabis affects users.’
The tasks involved tapping icons on the phone for 20 seconds, a simple memory coordination game and testing reaction time.