Human handedness – inherited or developed?

August 3, 2010

This post is a little off the topic of what I normally write about, but its something I’ve been wondering about lately as the little munchkin grows up. She’s 6 months old now and is starting to use her hands a lot, going through that grabby stage where anything within arms length is grabbed and shoved in the mouth.  I’ve noticed that more often than not she’s using her left hand for this exploring.  It’s her left hand that grabs her left foot, and her left hand that grabs the spoon during my attempts to introduce her to the wonderful world of solid food.

Does this mean she’s going to be left-handed?  Coming from an extended family of determinedly right-handed people this comes as a bit of a surprise, and makes me wonder if there is an inherited component to handedness, or if there is some trigger during development that makes babies favour one hand over the other. Read the rest of this entry »