Displays used in the familiarization and test phases for Experiment 1, and mean looking times during test trials.

<p>A. Examples of displays used in the familiarization phase with a positive number-brightness pairing, where larger numbers are accompanied by brighter objects. In test, infants are shown new numbers and new brightness levels, either in a positive pairing where larger numbers are accompanied by brighter and higher contrast objects, or in an inverse pairing where larger numbers are accompanied by darker or lower contrast objects. B. Mean looking times (seconds) to the positive and the inverse test pairing trials. The asterisk denotes a significant difference between looking times to each pairing.