Prenatal smoking linked to smaller visual cortex development
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Researchers at Université de Montréal and Sainte-Justine hospital discovered that smoking during pregnancy correlates with a smaller primary visual cortex in both a Quebec cohort and a large British biobank study.
Tomáš Paus and Zdenka Pausova led a long-term study following over 1,000 adolescents, assessing how prenatal experiences affect brain development. They found that individuals exposed to cigarette smoke before birth consistently had a reduced surface area in their V1 brain region, which processes visual information.
The team expanded their research to include data from approximately 20,000 adults in the British biobank and observed the same connection. They believe that spontaneous waves of activity originating in the retina play a crucial role in shaping the visual cortex, even before a baby is born. Nicotine, a chemical in cigarette smoke, interferes with acetylcholine, a neurotransmitter necessary for these retinal waves, potentially hindering V1 development.
While the researchers note that a larger visual cortex doesn’t automatically equate to better vision in humans, they found a correlation between V1 size and shape perception abilities within the British biobank data. This research reinforces that the brain develops through both genetic programming and early experiences, beginning with internal activity in the womb.
