handedness

4 Stories

It Turns Out Kangaroos Are Lefties

Red and eastern gray kangaroos are all left-handed, researchers find

(Newser) - Handedness (the preference for using one hand over the other for nearly all tasks) likely emerged in humans soon after we began to walk upright. And for years scientists have thought this trait belongs almost exclusively to bipedal primates, given it's never before been observed in quadruped creatures. Now... More »

When Exploring, Ants March to the Left, to the Left

Scientists are exploring this 'behavioral lateralization'

(Newser) - Roughly nine in 10 humans are right-handed, an example of "brain lateralization" that's pretty common among vertebrates—and now apparently invertebrates. Researchers in the UK are finding that even ants—which are invertebrates, meaning they have exoskeletons—carry an innate directional bias, in their case almost always turning... More »

Bad News for Lefties: You Have More Health Risks

Left-handed people more likely to develop neural disorders

(Newser) - About 10% of the population is left-handed, but a disproportionate amount of people with schizophrenia—20%—are lefties. Schizophrenia is just one of a number of psychiatric and developmental disorders that are more common in left-handed people, including dyslexia, ADHD, language difficulties, and mood disorders. Researchers think this could have... More »

Octopus Has How Many Legs? Guess Again

New research shows denizens of the deep show specialization, and handedness

(Newser) - Octopuses may not be eight-legged creatures after all, new research suggests. They do indeed have eight limbs, but some function more like arms, AFP reports. It breaks down like this: the front two are the most nimble and armlike, and are used for exploration; the back two are used mostly... More »

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