Marijuana’s surprising vision benefit – Marijuana use by pregnant women has been shown to have a surprising benefit for how their children see moving objects
A study of children exposed to recreational drugs in the womb has turned up the surprising result that marijuana can improve how they see moving things.
Children exposed to marijuana were 50 per cent better at the global motion task – detecting movement of signal dots against the background “noise” of other dots – than children who weren’t exposed, University of Auckland scientists say.
Their study, which looked at 145 four-and-a-half year olds who were exposed to different combinations of methamphetamine, alcohol, nicotine and marijuana before birth, was published in Nature: Scientific Reports this week.
Most studies have investigated how recreational drugs impair motor and cognitive development in children, but the impact on visual areas of the brain is less well understood, says doctoral researcher Arijit Chakraborty.
The 50 per cent improvement in the global motion task for children exposed to marijuana in the womb was an unexpected result, he said.
It was found that when mothers drank alcohol alone their children’s motion perception was impaired, but when they consumed both marijuana and alcohol there was no effect – “suggesting that the benefits from marijuana cancelled out the harm from alcohol”.
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