Snapping: America's Epidemic of Sudden Personality Change is a 1978 book written by Flo Conway and Jim Siegelman which describes the authors' theory of religious conversion.

They propose that "snapping" is a mental process through which a person is recruited by a cult or new religious movement, or leaves the group through deprogramming or exit counseling.

Sudden change comes in a moment of intense experience that is not so much a peak as a precipice, an unforeseen break in the continuity of awareness that may leave them detached, withdrawn, disoriented – and utterly confused.

[8] Conway and Siegelman further proposed that a disorder which they named "information disease" was caused by alteration of the neurological pathways of the brain by group indoctrination and mind control activities.

[10] Reverend Mark L. Middleton, though noting that he does not fully endorse the views of the book, believes its an important contribution to "religious and mental health literature".