The first and last picture of the false-belief task.

Pictures of the false-belief task show the set-up of the containers before the protagonist left the room (a) and after his return (b).</p

Boxplots representing the ratings of the probability that Niklas would look into the black, white, yellow, or blue container first.

The lower and upper box boundaries represent the lower and upper quartiles, respectively. The horizontal line inside the box represents the median. When no horizontal line is present inside a box, the median is 0. The cross represents the mean. The lower and upper whiskers represent minimum and maximum scores, respectively. Dots outside the box represent values that deviate from the upper quartile by more than 1.5 times the interquartile range.</p

The dataset used for the analyses reported in the manuscript.

The dataset used for the analyses reported in the manuscript.</p

Mean (SD) subjective ratings and salivary cortisol in the stress and control condition.

Mean (SD) subjective ratings and salivary cortisol in the stress and control condition.</p

Mean salivary cortisol concentrations of participants from the control and stress condition throughout the experiment.

Mean salivary cortisol concentrations of participants from the control and stress condition throughout the experiment.</p

Results.

<p>Percentage of infants performing a head touch in each of the four experimental conditions. The original conditions are represented by the first (hands-free) and the third (hands-occupied) column.</p

Experimental setup.

<p>The model before performing the head touch action in the hands-occupied and hands-occupied familiarization condition (A), the hands-free condition (B), and the hands-free distraction condition (C).</p