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Particularly, it focused on the cognitive and affective processes underlying individuals' convergence and divergence through speech.
Since speech is a way to express group membership, people adopt convergence or divergence in communication to "signal a salient group distinctiveness, so as to reinforce a social identity".
Mammals, birds and reptiles vary the optical power by changing the form of the elastic lens using the ciliary body (in humans up to 15 dioptres).
Fish and amphibians vary the power by changing the distance between a rigid lens and the retina with muscles.
While it is well understood that proper convergence is necessary to prevent diplopia, the functional role of the pupillary constriction remains less clear.
Arguably, it may increase the depth of field by reducing the aperture of the eye, and thus reduce the amount of accommodation needed to bring the image in focus on the retina.