To begin with, there is evidence that a big part of AA’s effectiveness may have nothing to do with the actual steps. It may derive from something more fundamental: the power of the group. Psychologists have long known that one of the best ways to change human behavior is to gather people with similar problems into groups, rather than treat them individually. The first to note this phenomenon was Joseph Pratt, a Boston physician who started organizing weekly meetings of tubercular patients in 1905. These groups were intended to teach members better health habits, but Pratt quickly realized they were also effective at lifting emotional spirits, by giving patients the chance to share their tales of hardship. (“In a common disease, they have a bond,” he would later observe.) More than 70 years later, after a review of nearly 200 articles on group therapy, a pair of Stanford University researchers pinpointed why the approach works so well: “Members find the group to be a compelling emotional experience; they develop close bonds with the other members and are deeply influenced by their acceptance and feedback.”
Researchers continue to be surprised by just how powerful this effect is. For example, a study published last year in the journal Behavior Therapy concluded that group therapy is highly effective in treating post-traumatic stress disorder: 88.3 percent of the study’s subjects who underwent group therapy no longer exhibited PTSD symptoms after completing their sessions, versus just 31.3 percent of those who received minimal one-on-one interaction.
The importance of this is reflected by the fact that the more deeply AA members commit to the group, rather than just the program, the better they fare. According to J. Scott Tonigan, a research professor at the University of New Mexico’s Center on Alcoholism, Substance Abuse, and Addictions, numerous studies show that AA members who become involved in activities like sponsorship—becoming a mentor to someone just starting out—are more likely to stay sober than those who simply attend meetings.
Wired magazine takes an in-depth look at how Alcoholics Anonymous works from a human psychology and neuro-chemical standpoint.

