Frequencies of Looks That the Infants Oriented at the Stimulus during the Baseline and the Stimulus Period

<p>Asterisks (*) indicate a significant increase in number of looks (stimulus versus baseline) for a specific stimulus (at least <i>p</i> < 0.05). Pound symbols (#) indicate that this effect is close to statistical significance (<i>p</i> < 0.07). Because data concerning looks at models' LPS, MO, and TP were very similar, they were averaged and pooled. Frequencies are ± standard error of the mean.</p

Experimental Conditions

<p>Figures on the left represent stimuli during resting conditions and baseline. Figures on the right depict the stimuli when fully expressed. In the DISK condition, the disk was repeatedly rotated 90° clockwise and counterclockwise.</p

Two Examples of a Monkey's Response to the Stimuli Mouth Opening and Tongue Protrusion

<p>MO is shown on the left; TP on the right. Figures were taken from <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0040302#pbio-0040302-sv001" target="_blank">Videos S1</a> and <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0040302#pbio-0040302-sv002" target="_blank">S2</a>. Frame A1 was taken 21.12 s after frame A, whereas frame B2 was taken 13.38 s after frame B.</p