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Old 03-17-2016, 03:28 PM
wevets wevets is offline
Join Date: Mar 2000
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Originally Posted by Broomstick View Post
So... apparently lateralization appears in species that make/use tools and might have something to do with brain organization. Which side is favored seems a bit of a crap shoot, but the more a species makes and uses tools the more likely the majority will favor one side or another.

Bottom line: it appears to be connected to tool making and use, and since humans are so specialized in that role it makes some sense we'd have strong lateralization.

Although there are some exceptions - grey whales are mostly right-[s]handed[/s] [s]-flippered[/s] -mouthed, we know this from imaging their feeding dives and observing the relative wear on the right-versus-left sides of their heads.

Much handedness may indeed be related to tool-use, but other forms of manipulation of the environment may be important to the exceptions.