nucleation

LIT-1269: Intuitions about personal identity: An empirical study

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StatusActive — read 2026-10-20 (NOTE-996) in full, from the published PDF linked from the first author's own publications page; worth reading as the first survey test of Williams's two tellings of the body-exchange case and of his two explanations of why they diverge. Undergraduates mostly say a brain-transplant patient whose memories are erased is no longer the same person, and mostly say that a patient whose distinctive mental states are wiped will still feel the pain of later injections; neither result moves with first- against third-person telling. Asked abstractly, about 70% name psychological factors and more than 80% deny that someone without any of their memories could be them; made to choose, 64% side with memory (p = 0.053). Read it as evidence about how a concept of personal persistence responds to framing in one student population, not about what persistence is: the authors make the bearing conditional on intuitions informing the theory, test only necessity of psychology, and leave unseparated whether the Pain vignette asks about identity or about bare sentience.
Tagspersonhood, cognition, epistemology, metaphysics
Cited as “paper” byNOTE-996 — Nichols & Bruno — Intuitions about personal identity

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Nichols, S. & Bruno, M. (2010). Intuitions about personal identity: An empirical study. Philosophical Psychology 23(3), 293–312. DOI 10.1080/09515089.2010.490939.

Key takeaways

From the reading, NOTE-996.

  • Williams’s divergence is real for these participants. A transplant case makes memory look necessary: the patient whose memories were erased is judged not to be “still Jim” (t(28) = 3.17). A simplified Pain case makes it look unnecessary: 68% (all N = 50) and 75% of those who understood the case (N = 28) say that “you will feel the pain” after your distinctive mental states are eliminated.
  • First against third person is not what drives it. Both cases come out the same in either telling (Pain: 72% of N = 54 for “Jerry”; χ²(1, N = 64) = 0.062 against the first-person version). Williams’s suggestion that the mentalistic verdict comes from the third person and the bodily one from the first is not borne out.
  • Abstract questions favour psychology. Asked openly what makes a future person you, over 70% name memory, personality or the like; over 80% deny that someone with none of your memories could be you.
  • Under reflection the psychological answer is preferred, narrowly. Shown both and told they are inconsistent, 64% of 45 side with memory (χ² = 3.76, p = 0.053).
  • The claim is conditional and robustness-based. The authors propose that the Pain frame carries a “thought experimenter demand” (“if I am not going to feel it then who is?”) and that the more robust intuitions should get more weight, “assuming that intuitions should inform our theories of personal identity”. Only the necessity of psychology was tested; sufficiency was abandoned because pilot participants could not follow Williams’s full case.

Standing in the record

Filed on 2026-10-20 at the owner’s request, in the round of experimental work near the rubber hand illusion, alongside the other folk-concept studies of that round (Starmans & Bloom 2012; Reuter, Sienhold & Sytsma 2019; Borg, Harrison, Stazicker & Salomons 2019). Read in full: Active, as the first survey test of the case the record holds at first hand in Williams (LIT-462, THEORY-531).

It bears on none of the rubber hand THEORYs. THEORY-766, THEORY-769, THEORY-767 and THEORY-768 concern what makes a body part or a body felt as one’s own now, in the self sense ADR-024 keeps under self. This work concerns judgements about whether a person persists over time, which ADR-024 files under personhood; no stimulation, ownership or self-location measure appears in it, and nothing in it meets, partly meets or bears against any of their promotion or refutation conditions. The one shared theme is methodological: its “thought experimenter demand” is the vignette-study cousin of the expectation and suggestion problem THEORY-766 names, and it is no more controlled here than there.

What it does bear on, set out in the NOTE:

  • THEORY-531 (Williams’s two tellings). Its promote_when already says that reports of what people would fear “cannot settle” a claim about what fear can rationally follow, and this study does not ask about fear at all. It does test two empirical asides in Williams (pp. 179–180): that grammatical person goes with the verdict, and that the swap verdict is an artefact of the experimenter stopping where the description is neatest. Among these students neither holds.
  • THEORY-417 and NOTE-374 (Olson’s map). The study runs on the persistence question, but its Pain item (“you will feel the pain”) may be read as a question about a subject of experience rather than about the person, and in the vignette the procedure cures the brain rather than destroying it. NOTE-374 lists “thought experiments are evidence” as an assumption of the debate, and Olson holds the persistence question is not about the meaning of words. On that view, which this paper does not dispute, a survey of how people apply the word can inform a theory only through a premise that the concept tracks the fact.
  • THEORY-546 (psychological continuity) and the bodily rival in Olson (LIT-448). The study finds that students’ abstract and reflective judgements favour psychological necessity. That is evidence about the folk concept. It is not evidence for psychological continuity as the persistence condition, which is the claim THEORY-546 makes.
  • LIT-451 (Hume). The frame-dependence fits Hume’s verdict that hard cases “can never possibly be decided” and are “grammatical rather than philosophical”. The authors hold that the more robust intuition can break the tie. The pairing is mine.

No instruction for machine-learning practice.

Cited on 2026-10-20 in THEORY-531’s “What this does not say”, for the absence of a first- against third-person difference in ordinary verdicts.

The authors’ reply, Berniūnas & Dranseika 2016 (LIT-1308), was filed on 2026-10-21 as Unavailable. No lawful full text was reached, so the open question NOTE-996 names about it stays open.

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