Birding may help protect the brain from dementia, study finds

Birdwatching may leave a measurable mark on the brain: a study of 29 expert birders found more compact tissue in regions tied to attention, perception and memory, along with stronger brain activity when they identified unfamiliar birds.

The Journal of Neuroscience paper, titled The Tuned Cortex: Convergent Expertise-Related Structural and Functional Remodeling across the Adult Lifespan, examined 29 expert birders ages 24 to 75 and 29 matched novices ages 22 to 79. The research team, including Erik A. Wing, Jordan A. Chad, Geneva Mariotti, Jennifer D. Ryan and Asaf Gilboa, reported that the experts showed lower mean diffusivity in frontoparietal and posterior cortical regions, a pattern the authors interpreted as more compact structure.

Those same regions are central to attention, perception and memory. In the study, they became more active when the birders identified less familiar, nonlocal birds, and lower mean diffusivity predicted higher identification accuracy among experts. The findings point to a brain that appears tuned by long experience, not just entertained by a hobby.

The evidence does not go as far as some of the headlines surrounding it. The study did not prove that birding prevents dementia or stops age-related cognitive decline. What it did show is that expertise was associated with structural and functional differences that could fit into the broader idea of cognitive reserve, the brain’s ability to draw on built-up skills and networks when age-related change sets in.

That argument is not new. In July 2022, Baycrest researchers reported that expert knowledge can help older adults memorize new information by giving the brain mental scaffolding. Their work, based in Toronto and drawing on local bird experts recruited through groups including the Toronto Ornithological Club and Toronto Field Naturalists, suggested that expertise can be a strength to harness against age-related memory decline. In the birding context, researchers have said older birders may remember arbitrary faces paired with birds better than beginners.

The new findings fit that line of research, but they still describe association, not prevention. Birding may help because it demands sustained attention, repeated visual discrimination, movement outdoors and social engagement, all ingredients that can challenge the brain in ways a passive pastime does not. For now, the strongest claim is narrower than the hype: experienced birders showed brain patterns linked to better performance, and those patterns may help explain how an interest in birds could support cognitive health over time.