A study conducted by Agnes Kovacs compared two groups of babies – those who were exposed to two languages from birth, and those who were raised with one language. Babies were presented with an audio cue, and then they were shown a puppet on one side of the screen. Both baby groups learned to look toward that side of the screen in anticipation of the puppet. However, in a later set of trials, the puppet started popping up on the opposite side of the screen. The baby group that was exposed to a bilingual environment learned very quickly to switch their ‘anticipatory gaze’ in the new direction, while the other group of babies did not.