Gregg highlights the evolutionary advantages of assuming that eyes, movement, or language for example constitute evidence of human attributes. This tendency, which Gregg describes as an Anthropo-Dial, is counterbalanced by another tendency, which he calls the Humanity-Limiter, that reduces the chance of delusions.

These tendencies Gregg acknowledges can be exploited by propaganda for example or in advertising, and can also help explain dehumanization in racism for example or other prejudices. However, these tendencies especially when coupled with critical reflection, can produce better relationships and fuller lives as well as a more humane world.