Deconstructing the “Two Factors” (Dror 2017)
A history-of-science reexamination of how the Schachter–Singer two-factor theory of emotion actually came about — as opposed to the tidy intellectual genealogy (James–Lange → Cannon → adrenalin experiments → Schachter–Singer) that the 1962 paper itself installed and that textbooks repeat. See cognitive-appraisal and the debate page origins-of-two-factor-theory.
Part 1 — A social-influence model generalized into a cognitive one
Dror’s reconstruction, from Schachter’s The Psychology of Affiliation (1959), unpublished manuscripts, and interviews with Ladd Wheeler, Nisbett, and Ross:
- Schachter’s project extended Festinger’s social-comparison theory (a “drive for self-evaluation” via comparison with others) from opinions/abilities to emotions. To do so he needed to assume emotions are partly cognitively determined — which is where the “cognitive” element entered, via Ruckmick (1936) and Young (1943), not via engagement with James–Lange.
- The Schachter–Singer euphoria condition (a stooge — originally Wheeler — acting euphoric) was pure social influence, structurally identical to the affiliation studies. Only the anger condition added an explicit cognitive rationale.
- Wheeler (personal communication): “I don’t think that the James–Lange controversy was important to us.” The James–Lange framing and the Cantril & Hunt / Landis & Hunt citations were added at reviewer (Solomon) request; the original manuscript cited only Marañón (1924).
- The first true enactment of the cognitive-arousal theory was the follow-up Schachter–Wheeler (1962) study, where a funny movie (not a social stooge) supplied the explanation for arousal — proving “any cognition would do.” These follow-ups (Wheeler; Latané & Schachter rats; Singer’s dissertation) were designed to patch weaknesses in the original experiment, not to test a pre-existing theory.
Part 2 — Adrenalizing every emotion
Dror’s more consequential claim: the theory’s real historical significance is that it made sympathetic activation constitutive of emotion qua emotion. This culminated a decades-long transformation:
- Cannon (1915) studied adrenalin only in the “strong”/belligerent emotions (rage, fear) and insisted on a sympathetic (“strong”) vs parasympathetic (“soft”) distinction. See walter-cannon.
- Across the early 20th century, non-belligerent activities and emotions (joy, love, a movie, chess) were progressively “adrenalized.”
- Singer’s dissertation asserted “sympathetic arousal does seem to be common to all those things which we called emotions.” Schachter & Singer universalized this — even though they only injected adrenalin, yet theorized in terms of the whole sympathetic system, and despite 1940s evidence for parasympathetic involvement (blushing, tears, erection).
Why this matters for the wiki
Dror’s paper is the historiographical counterweight to friedman-2010-jamesian-perspective: where Friedman treats Schachter–Singer as a (flawed) empirical challenge to autonomic specificity, Dror shows it was never really about the James–Lange/specificity question at all. The undifferentiated-arousal premise that Friedman’s specificity researchers spent decades rebutting was, on Dror’s account, a social-psychological import, not a physiological finding.