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Surprising vision benefit of Cannabis

21/11/2015

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A study of children exposed to recreational drugs in the womb has turned up the surprising result that cannabis can improve how they see moving things.

Children exposed to cannabis 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 cannabis 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 cannabis 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 cannabis and alcohol there was no effect - "suggesting that the benefits from cannabis cancelled out the harm from alcohol".

"This perhaps has implications for preventing some of the effects of Foetal Alcohol Syndrome."

Prenatal exposure to methamphetamine had no influence on vision.

The majority of the study's children (81.3 per cent) had been exposed to multiple drugs. Twenty-five children (15 per cent) had no drug exposure and provided a non-drug exposed control group.

The mothers' prenatal drug exposure was verified by meconium analysis.

Other visual functions, such as measures of visual acuity were not affected by drug exposure.
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    • Health Select Committee inquiry into Rose Renton’s medicinal cannabis petition - have your say!
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