And wherever group flow shows up, it leaves its mark. The same pleasure chemicals behind individual flow also arrive with the group variation—only we seem to like them more. In comparison studies run by St. Bonaventure University psychologist Charles Walker, “solitary flow” (what Doug Ammons experienced on the Stikine) was measured against “coactive flow” (this comes from individual activities done in groups, like surfers sharing a break) was measured against “interactive flow” (where interaction is inherent to the activity, like rock climbing with a partner). Walker discovered that the more
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