Average number of classes as a function of age of the participants.

<p>Standard deviations are depicted for each age group. Significant differences between age groups are represented by the brackets and astericks (representing p<.05).</p

Description of the participants.

<p>Description of the participants.</p

Average sorting sounds distances.

<p>Average sorting sounds distances.</p

Additive trees showing both similarity and differences across sounds as function of age.

<p>The shorter is the line connecting two sounds, the more the sounds are judged similar.</p

Distribution of the center of gravity of the sounds and frequency bands, ranging by frequency from low to high (scaled in log to base 10).

<p>Circles represent non-linguistic human vocalizations, square musical instruments, and diamond environmental sounds.</p

Proportions of Central Partitions 1 and 2 performed by the subjects according to their age.

<p>The other types of partitions have been grouped together (labeled “Others Partitions”).</p

Illustration of the two main central partitions performed by participants, independent of the age.

<p>Illustration of the two main central partitions performed by participants, independent of the age.</p