Addiction Drug Use Marijuana How Marijuana Affects Sustained Attention By Buddy T Buddy T Facebook Twitter Buddy T is an anonymous writer and founding member of the Online Al-Anon Outreach Committee with decades of experience writing about alcoholism. Learn about our editorial process Updated on March 30, 2020 Medically reviewed Verywell Mind articles are reviewed by board-certified physicians and mental healthcare professionals. Medical Reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more. by David Susman, PhD Medically reviewed by David Susman, PhD David Susman, PhD is a licensed clinical psychologist with experience providing treatment to individuals with mental illness and substance use concerns. Learn about our Medical Review Board Print Aaron Black / Getty Images There is a belief held by many marijuana users that smoking weed heightens their awareness and therefore increases their ability and skills in doing tasks, such as driving a motor vehicle. Many people who self-report marijuana use claim that they are actually better drivers when they are high than when they are not. But, is that actually the case? The Effect of Marijuana on Attention Researchers at the University of Georgia have found that it could be true that smoking marijuana may indeed increase the user's motor skills for a while. But, they conclude that over time any increase in skill level they may acquire is negated by serious attention problems. The Georgia researchers, led by Jonathon Crystal, found that sustained attention to timing-tasks was substantially altered in laboratory rats when they were given a synthetic cannabinoid. Under the influence, the lab rats displayed difficulty distinguishing between long and short periods of time during tasks for which they were trained. Long-Term Attention Problems Related to Marijuana "In the real world, this suggests that someone smoking marijuana might well be able to do a task briefly, but over time there could be serious attention problems," said Crystal. The implication is that users of marijuana could be lulled into thinking they are capable of using the motor skills for such actions as driving when in fact there could be serious long-term attention-span problems. For the study, the scientists set up a task which the rats usually perform with a great deal of accuracy. They learned to press one lever to receive a pellet of food after hearing a short sound (four seconds) or another lever if the sound was long (16 seconds). Measuring Attention Spans "Under these circumstances, animals will typically learn to press the correct lever with high accuracy," the authors said. The research team then played sounds of intermediate length to find a midpoint at which rats were equally likely to respond as if the sound were "short" or "long." Substantial Decline in Sensitivity to Time After the rats learned the right levers to press, they were injected with a synthetic cannabinoid, and their sensitivity to time was measured. Being under the influence produced a substantial decline in sensitivity to time. The researchers said they used a synthetic compound rather than tetrahydrocannabinol (THC), the "active" ingredient in marijuana because the synthetic cannabinoid is more powerful and easier to use in laboratory settings. "However, it is so close chemically to THC," they said, "that the findings can be equated with the effects of THC." The investigators concluded that the general ability to maintain attention was altered by exposure to the cannabinoid. The cannabinoid produced an attention disorder and disrupted the performance of the task. Is Marijuana a Depressant? 2 Sources Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Crystal JD, Maxwell KM, Hohmann AG. Cannabinoid modulation of sensitivity to time. Behav Brain Res. 2003;144(1-2):57-66. doi:10.1016/s0166-4328(03)00062-7 University of Georgia. Rat study conducted by UGA researchers suggests that cannabis interferes with sustained attention. EurekAlert!. By Buddy T Buddy T is an anonymous writer and founding member of the Online Al-Anon Outreach Committee with decades of experience writing about alcoholism. See Our Editorial Process Meet Our Review Board Share Feedback Was this page helpful? Thanks for your feedback! What is your feedback? Other Helpful Report an Error Submit Get Treatment for Addiction Advertiser Disclosure × The offers that appear in this table are from partnerships from which Verywell Mind receives compensation.