The case
A4: “In three field experiments, Kalla and Broockman (2020) found that nonjudgmental exchanges of personal narratives could produce persistent reductions in exclusionary attitudes, whereas arguments alone did not produce comparable effects in their immigration-policy experiment.” (LIT-1407, unread; its summary is from the abstract.)
What it shows
- The nearest field contrast to CLAIM-430’s defeater. The claim falls if information of equal favourable content changes attitudes as much as taking part does. A conversation in which both parties exchange narratives is closer to taking part than an argument heard; the arms differ in that, and the narrative arm’s effect persisted.
- A4’s distinction, between “telling someone what to think” and “engaging them in an interaction that changes what they can meaningfully think”.
What it does not show
- That the effect runs through a perspective. A4: “Those studies don’t isolate organizational-perspective formation as the mediator.” The arms also differ in warmth, attention and length.
- That arguments never work, or that narrative exchange always does. The exchange’s comparison is to one experiment’s argument arm.
- Large effects. LIT-1407’s abstract: the narrative arm reduced exclusionary attitudes “for at least four months (d = 0.08)”, and the replications on transphobia gave d = 0.08 and 0.04. Only Experiment 1 had an argument-only arm.
Note of 2026-10-29: the paper, read
LIT-1407 is now read (NOTE-1396), so “unread” and “unchecked against the paper” no longer hold. The description is right, and can be made exact.
- “Arguments alone did not produce comparable effects.” The abbreviated arm’s pooled effect is d = 0.02 (p = 0.27), and its difference from the full arm is 0.06 (p < 0.01). But the arms’ difference is not significant at the one-month wave or, for prejudice, at three to six months.
- “Persistent.” A pooled effect over waves ending at about four and a half months, the last wave’s prejudice effect alone being p < 0.08.
- Length. The caveat that the arms “also differ in warmth, attention and length” is borne out on length by the paper’s own footnote 8: the full arm was twice as long.
One finding weighs against reading the narrative arm as taking part. In Experiment 2 a stranger’s video narrative, with voters sharing their own stories in 12% of conversations, did as well as the arm in which both parties told stories. What the arms shared was a non-judgmental conversation about a narrative, not the voter’s own enactment. The paper measures no behaviour and no generalization to other groups. The case is unchanged.