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SpaceDailyUpdated

A single-celled parasite carried by cats, Toxoplasma gondii, infects an estimated third of all people on Earth, forms tiny cysts in the human brain, and in rodents famously rewires them to lose their fear of cats, and mounting research links it in humans to raised dopamine, greater risk-taking, and impulsivity.

A parasite living in your brain may be subtly reshaping your personality, making you bolder, riskier, and less cautious than you'd otherwise be.

Updated 29 Aug 2026, 23:04Source published 25 Aug 2026, 15:35