Gray, A. W., Parkinson, B., &Dunbar, R. I. (2015). Laughter’s influence on the intimacy of self-disclosure. Human Nature, 26(1), 28-43.

If laughter functions to build relationships between individuals, as current theory suggests, laughter should be linked to interpersonal behaviors that have been shown to be critical to relationship development. Given the importance of disclosing behaviors in facilitating the development of intense social bonds, it is possible that the act of laughing may temporarily influence the …

Gervais, M., &Wilson, D. S. (2005). The evolution and functions of laughter and humor: A synthetic approach. The Quarterly review of biology, 80(4), 395-430.

A number of recent hypotheses have attempted to explain the ultimate evolutionary origins of laughter and humor. However, most of these have lacked breadth in their evolutionary frameworks while neglecting the empirical existence of two distinct types of laughter—Duchenne and non‐Duchenne—and the implications of this distinction for the evolution of laughter as a signal. Most …