Washington State University study finds THC disrupts memory and causes false memories
Updated
Updated · SciTechDaily · May 8
Washington State University study finds THC disrupts memory and causes false memories
8 articles · Updated · SciTechDaily · May 8
In a 120-person double-blind trial, regular cannabis users given 20mg or 40mg THC performed worse than placebo on 15 of 21 memory measures.
The strongest effects were on false, source and prospective memory, increasing reports of unseen words and impairing recall needed for appointments, medication and other daily tasks.
Published in the Journal of Psychopharmacology, the research found little difference between the two THC doses and comes as wider legalisation outpaces evidence on cannabis's short-term cognitive effects.
Why does one study say THC harms memory, while another finds it's safe for older adults' cognition?
If cannabis rewrites memory, can we trust eyewitness testimony from users in court?
Are teens who use cannabis permanently damaging their brain's potential for learning and memory?
THC Causes Active Memory Distortion Even at Moderate Doses: Insights from the 2026 WSU Study and Implications for Policy, Professions, and Public Health
Overview
A new study from Washington State University reveals that THC, the main psychoactive compound in cannabis, actively distorts memory, not just reducing recall but causing people to remember things incorrectly. This breakthrough comes as cannabis use becomes more common, especially in states where it is legal, yet its short-term cognitive effects remain poorly understood due to federal restrictions that limit research. The WSU study aims to fill this knowledge gap, helping people make informed decisions about cannabis use by showing that even moderate doses can significantly impair memory accuracy. These findings highlight the need for better public awareness and updated policies.