Adventures in Experimenting On Toddlers

The Wall Street Journal:

The Gopnik lab is rejoicing. My student Caren Walker and I have just published a paper in the well known journal Psychological Science. Usually when I write about scientific papers here, they sound neat and tidy. But since this was our own experiment, I can tell you the messy inside story too.

First, the study—and a small IQ test for you. Suppose you see an experimenter put two orange blocks on a machine, and it lights up. She then puts a green one and a blue one on the same machine, but nothing happens. Two red ones work, a black and white combination doesn’t. Now you have to make the machine light up yourself. You can choose two purple blocks or a yellow one and a brown one.

Read the whole story: The Wall Street Journal