Babies exposed to cannabis in the womb show a significant improvement in their ability to track moving objects at age four, according to a study [1]published in the most recent issue of the journal Scientific Reports.
“We were surprised with this initial finding,” says Ben Thompson, a professor at the University of Waterloo’s School of Optometry and Vision Science. “It shows that marijuana and alcohol can have quite an impact on a fundamental aspect of the visual processing happening in our brains.”
For the study, researchers tested higher-level visual processing in a group of 4 year-old children who were exposed to different combinations of marijuana, alcohol, methyl amphetamines, or nicotine while in the womb, compared with a non-exposed control group. Drug exposure was confirmed objectively by analyzing each baby’s meconium (which is a dark green substance forming the first feces of a newborn).
Results showed exposure to cannabis improved global motion perception, a measure of processing within the brain’s dorsal visual pathway which is responsible for motion processing and visual-motor control. In contrast, exposure to alcohol had a negative effect. Nicotine and methamphetamine had no effect on vision compared with the control group.
The full study can be found by clicking here[2].
This, of course, isn’t the first study to show that it may be beneficial for an infant to have cannabis in their system that they obtained via the womb; a 2-year study[3] published in the journal Pediatrics, which examined nearly 3,000 infant participants, found that babies born with cannabis in their system are drastically less likely to suffer from early mortality.