Other commonly used measures of empathy include tasks assessing recognition of facial expressions of emotion (considered critical for cognitive empathy). (link.springer.com)
One partially valid explanation may be that the actual processing of facial expressions in real time might be a task too complex for older chips. (bgr.com)
It also plays songs, teaches the names of shapes, and the names of feelings associated with facial expressions pictured on the buttons. (wetheparents.org)