Limits of trust in medical AI

In plain words

This is a philosophy paper, not a technical one. It asks whether a patient can really trust a medical AI system the way they trust a doctor. The author's answer is no. An AI can be reliable, meaning it gets things right often, but trust is a different thing. Trust, as the paper describes it, involves the other party caring about you and being answerable when things go wrong, and a software system has neither.

The concern is what happens if AI gets good enough that doctors defer to it. Then patients would lean on the machine instead of on a person, and the paper argues that this could hollow out the trust that makes the doctor-patient relationship valuable. The paper does not test any system or measure anything. Its contribution is the argument, and the practical advice it draws is to talk about "reliable AI" rather than "trustworthy AI".

TL;DR

A philosophical argument, not an experiment. Reliance on AI is not the same as trust, because interpersonal trust requires motives such as goodwill and normative obligations that an AI cannot bear. The paper concludes that replacing clinicians' epistemic authority with AI could produce shallow doctor-patient trust, so the field should use the vocabulary of reliability for AI. No numbers, models or code are reported.

Problem

The paper asks whether relationships of trust in clinical practice are at risk as AI takes over diagnosis, prognosis and treatment selection, the tasks the paper treats as central to the clinician's role § AI (AI in medicine). Its premise is that AI may come to exceed human clinicians on these tasks, which would shift epistemic authority away from doctors § AI (AI in medicine). The paper sets aside social trust, meaning trust in institutions, and considers only interpersonal trust between individuals § Trust (Trust in medicine), note 1. Without that scope restriction the argument would not apply.

Method

The paper is a conceptual argument. It has no algorithm, model, dataset or experiment. The steps below summarise how the argument proceeds. Sections in the source are unnumbered, so each citation gives the first word of the section as the locator and the full section title in parentheses, for example [§ Trust] (Trust in AI).

1. Trust has intrinsic and instrumental value in medicine. Intrinsically, it follows from the patient's vulnerability and gives the physician a fiduciary obligation. Instrumentally, it supports adherence to treatment and may have therapeutic effects § Trust (Trust in medicine).
2. AI's effect on trust depends on its role. If AI is only a measuring tool used by a clinician, the effect on trust is expected to be small. If AI gains epistemic authority, the effect becomes large § AI (AI in medicine).
3. The paper cites evidence that deep learning already matches clinicians on some diagnostic tasks, while noting methodological limits in that literature § AI (AI in medicine), footnote 3. It also notes that correlation-based learners have limited capacity to find causes § AI (AI in medicine), footnote 2.
4. The paper frames the displacement of clinicians as a problem that Humphreys calls an "anthropocentric predicament". It contrasts two responses: substitutionism, which predicts AI will make doctors obsolete, and extensionism, which predicts AI will extend clinicians' roles and keeps a human presence for empathy § AI (AI in medicine).
5. If AI outperforms clinicians, doctors have reason to defer to it, and deference would be needed to reach some goals of medical AI, such as fewer errors and less waste § AI (AI in medicine).
6. Accounts of trust such as Hardin's, Baier's and Jones's require the trusted party to have good will or to take the truster's interests as their own. An AI has neither, so it is not a suitable object of this kind of trust § Trust (Trust in AI).
7. On a normative account, trust creates an obligation in the trusted party, and trust is distinct from mere reliance because it involves an expectation about how the other ought to act § Trust (Trust in AI). Moral responsibility for a harmful error falls on designers, supervisors or institutions, not on the AI § Trust (Trust in AI).
8. The paper concludes that AI can be reliable but not trustworthy, and that reliance on AI is a shallower relationship than trust in a clinician § Trust (Trust in AI). The conclusion section recommends reframing the EU "trustworthy AI" agenda as "reliable AI", and reserving "trust" for relationships between agents § Conclusion.

The source contains no algorithm block. The test below restates steps 6 to 8 as code, to show the structure of the argument. It is not from the paper's text and is not an implementation.

# Argument as a test for appropriate trust  [§ Trust] (Trust in AI)
# Input:  trusted: an agent or system
# Output: True if trusting it is appropriate under the cited accounts

def appropriate_object_of_trust(trusted):
    # Trust, unlike reliance, requires good will or taking the
    # truster's interests as one's own  [§ Trust] (Trust in AI)
    if not has_good_will_or_shared_interests(trusted):
        return False
    # Trust creates obligations the trusted party must be able to bear
    # [§ Trust] (Trust in AI)
    if not can_bear_obligations(trusted):
        return False
    # The paper's familiar notions all require agency [§ Conclusion]
    return True

No figures, tables, equations or algorithms appear in the source.

Hyperparameters

Not applicable. The paper reports no training, models or configurable settings § Introduction.

Results

Not applicable. The paper presents no experiments, datasets or measurements of its own. The only numbers in the text come from the works it cites, and the paper describes a meta-analysis of deep learning and clinician performance as having methodological problems § AI (AI in medicine), footnote 3. The card does not repeat those figures as results of this paper.

Paper vs code

No official code.

The paper's text and metadata contain no link to code, a project page or a dataset. A GitHub repository search for the title returned only an unrelated reference-list repository, which is not owned by the author.

Pitfalls

• Argument, not method. An implementer cannot build anything from this card. It is useful for understanding the case for reliable AI in clinical work, and for reading the trust-vs-reliance debate in the paper's sources.
• The conclusion depends on the premise. The author argues that trust needs motives or agency that AI lacks. This premise is drawn from the accounts the paper cites § Trust (Trust in AI). Readers who accept a broader notion of trust, or who think trust can be placed in institutions or systems, would not reach the same conclusion. The paper sets social trust aside § Trust (Trust in medicine), note 1.
• Scope. The concern is about interpersonal trust in doctor-patient relationships. The paper does not evaluate any specific AI system or clinical outcome.
• Date mismatch. The source's date field reads March 27, 2020, and the source describes itself as a pre-print of an article in the Journal of Medical Ethics (vol. 46, no. 7, pp. 478–481). The arXiv metadata gives a published date of 2025-03-20 and an updated date of 2025-04-03 (v2). The license was taken from arXiv.
• Empirical claims are secondhand. The paper's evidence that AI matches clinicians on some tasks comes from a cited review, which the paper itself says has methodological limits § AI (AI in medicine), footnote 3.
• Unnumbered sections. The source has no section numbers, so section citations use the title form shown in Method.

Lineage

• Builds on: the philosophical accounts of trust it cites, mainly Hardin (encapsulated interest), Baier and Jones (good will), and Nickel (normative expectations) § Trust (Trust in AI).
• Compared against: the substitutionist and extensionist views of medical AI § AI (AI in medicine), and the reliability-based accounts of trust in AI attributed to London and Lipton § Trust (Trust in AI).
• Superseded by: not known from this wiki.