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REVIEW 4 major objections 6 minor 74 references

Can LLMs and humans be friends? Uncovering factors affecting human-AI intimacy formation

T0 review · 4 major / 6 minor · reviewed 2026-08-07 · deepseek-v4-flash

Pith's one-line read Gradually deepening what a person and an LLM share in conversation increases felt social closeness, even when the chatbot's personality does not match the user's.

desk verdict The paper's central causal claim—that gradual self-disclosure drives intimacy in human-LLM chats—is not actually tested, because every participant got the same fixed question sequence with no control condition. read the letter →

arxiv 2505.24658 v1 pith:QJZH4OXU submitted 2025-05-30 cs.HC

classification cs.HC
keywords Human-AIinteractionIntimacySelf-disclosureSelf-criticismLargelanguagemodelChatbotGradualConversationalnaturalness
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Can a person feel friendship with a large language model? This paper argues yes, and claims that the clearest lever is how disclosure unfolds over time, not who the partner appears to be. In two experiments using a staged conversation protocol, 82 young adults answered questions that moved from light topics to personal ones, and perceived social intimacy rose steadily across the three stages. Making the LLM's responses more natural through a self-criticism step raised early intimacy and improved first impressions, while personality matching had no consistent effect, and revealing that the partner was an AI did not change results. The paper concludes that relationship-building with LLMs is driven by conversational dynamics, and offers design guidelines for gradual disclosure, colloquial language, and calibrated empathy.

What carries the argument

The carrying mechanism is a three-stage conversation protocol adapted from the classic fast-friends closeness procedure [2]: 33 questions divided into three sets of 11, with each set probing deeper self-disclosure, and intimacy measured after each stage with the Subjective Closeness Index [5] and Interpersonal Judgement Scale [10]. This protocol converts 'gradualness' from a description into a manipulated variable. Study 2 adds a second mechanism, a self-criticism loop in which the LLM critiques its own draft responses against colloquial-style and sincere-empathy criteria and rewrites them; this operationalizes 'naturalness' and is what produces the higher early-stage intimacy scores.

What would settle it

Run the same staged protocol with a control group that spends the same total time conversing but receives the 33 questions in a flat or reversed order of personal depth; if intimacy rises just as much in the control group, the light-to-personal trajectory itself is not what builds closeness.

Watch

Extended reading notes

Core claim

On the paper's own terms, the central discovery is that gradual self-disclosure—partnered dialogue that moves from surface topics to increasingly personal ones—significantly raises perceived social intimacy between a human user and an LLM, and does so independently of persona reciprocity. In Study 1, Subjective Closeness Index scores rose from a mean of 2.266 at the first stage to 3.516 at the third (Friedman test p < 0.001, all post-hoc pairwise comparisons significant). Participants in the 'unfit' persona condition actually reported higher closeness than those in the 'fit' condition, and in Study 2 persona similarity had no significant main effect at all. Whether participants believed they were talking to a person or to an AI made no significant difference, and self-criticism made responses feel more natural and boosted early-stage intimacy, though overly enthusiastic empathy sometimes broke immersion.

Load-bearing premise

The headline claim rests on the assumption that the steady rise in intimacy scores across the three stages is caused by the gradual deepening of the questions, rather than by the extra conversation time, the heavier emotional content of later questions, or simple familiarity with the partner.

Editorial extensions

If this is right

  • Chatbot designers should script escalating self-disclosure over the conversation rather than rely on a static persona.
  • Users can feel closeness to an AI even when they know it is an AI, so relationship-building does not require deception.
  • Persona-matching is not a reliable route to intimacy, and a too-similar persona combined with over-agreeable empathy can feel uncanny and reduce closeness.
  • Response naturalness shapes the first impression: colloquial style and sincere, context-limited empathy raise early-stage intimacy; excessive empathy must be calibrated.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A direct test of the paper's mechanism would compare three equally long conversations that end at the same personal depth but ramp at different speeds, separating the trajectory of disclosure from its final level.
  • The Study 1 result that a mismatched persona scored higher than a matched one suggests an upper bound on similarity: some divergence may keep the exchange feeling like a real encounter rather than a mirror; this is an empirical hypothesis the paper leaves open.
  • The results come from a single ~1-hour session with young South Korean adults on one LLM; whether gradual disclosure sustains friendship over weeks or transfers to other cultures and models is untested.
  • Because self-criticism changed both style and empathy, the early-intimacy boost cannot be attributed to either factor alone; a factorial design would parse which component carries the effect.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 6 minor

Summary. This paper reports two laboratory studies in which young South Korean adults chatted with a GPT-4o-based partner through a text interface. In both studies, all participants progressed through the same 33-question sequence adapted from Aron et al., partitioned into three sets of 11 questions, with the Subjective Closeness Index (SCI) and Interpersonal Judgment Scale (IJS) administered after each set. Study 1 (N=29) varied whether the LLM persona matched, opposed, or was neutral relative to the participant's pre-questionnaire profile. Study 2 (N=53) reused the same procedure, added blind versus non-blind conditions regarding whether participants were told the partner was an LLM, and replaced the vanilla LLM with a self-criticism-based response mechanism. The authors report that SCI increased significantly across stages, that persona similarity had little or inconsistent effect, that blindness had no effect, and that self-criticism improved naturalness and early intimacy. The paper closes with design guidelines for intimacy-supporting LLM chat systems.

Significance. If the central causal claim were supported, this would be a valuable extension of Aron et al.'s fast-friends procedure to human-LLM interaction, with practical implications for companion chatbots. The paper has notable strengths: it uses established intimacy scales, reports non-parametric tests appropriate for small repeated-measures samples, provides the full question and prompt materials in the appendices, and includes qualitative post-interview data that generate concrete hypotheses about style and empathy. These materials enhance reproducibility and will be useful to later work. However, the headline result is not established by the reported design, because the gradualness of self-disclosure is never varied. As a causal contribution, the paper's significance is therefore currently unrealized; the observed SCI increase could equally be produced by time on task, the emotional content of later questions, or growing familiarity.

major comments (4)
  1. [Section 3.3; Tables 1, 7, 9] The central claim that gradual self-disclosure "significantly enhances perceived social intimacy" (Abstract) is not supported by the design, because the disclosure trajectory is never varied. All participants receive the same fixed sequence of 33 questions, partitioned into three increasingly intimate sets (Section 3.3), and no condition uses static, shallow, or reverse-ordered disclosure. The increase in SCI across stages seen in Tables 1, 7, and 9 is therefore confounded with cumulative conversation time, the intrinsic emotional content of later questions, familiarity, and repeated measurement. The Introduction states that the authors "systematically vary the disclosure trajectory across interactions" (Section 1), but no such variation appears in either study. A control condition that presents the same material in a non-gradual order or with constant disclosure depth is the load-bearing missing cell for the causal attribution.
  2. [Section 4.5.3] The claim that self-criticism fosters higher intimacy in early stages is based on comparing Study 1 and Study 2 Stage 1 SCI means (Study 1: M = 2.26; Study 2: M = 2.86) across two different participant pools recruited in different months, with no inferential test reported. Because Study 2 has no within-experiment vanilla-LLM control condition, any difference between the studies could reflect sampling, timing, or procedural drift rather than the self-criticism mechanism. At minimum, the comparison should be accompanied by a statistical test and an explicit acknowledgment of its quasi-experimental status; ideally, response style should be varied within a single experiment.
  3. [Sections 3.1 and 3.3; RQ1.2] The factor described as "reciprocity" is not manipulated. The fit/unfit/neutral conditions vary the similarity between the participant's pre-questionnaire profile and the LLM persona (Section 3.1), while mutual self-disclosure is held constant: both the participant and the LLM answer the same Aron questions (Section 3.3). Consequently, the abstract's "regardless of persona reciprocity" conflates persona similarity with self-disclosure reciprocity, and RQ1.2/RQ2.2 cannot support any conclusion about the effect of reciprocal disclosure.
  4. [Tables 5 and 11] The Study 2 mean SCI and IJS values reported in Table 11 are numerically identical to the Study 1 values in Table 5 (e.g., Unfit SCI at Stages 1-3 are 3.055, 3.722, 4.361 in both tables), despite the different sample sizes (29 vs. 53) and the addition of blindness conditions. Since identical means across independent samples are extremely unlikely, either the table contains a copy error or the descriptive statistics were not recomputed for Study 2. This undermines the textual claims that "similar to Study 1, we observed..." and the descriptive support for RQ2.2; the authors should correct or explain this.
minor comments (6)
  1. [Table 10, Section 4.5.2] The stage main effect for IJS in Study 2 is reported as p = 0.0535 with an asterisk, and the text calls it a "significant main effect"; under the conventional 0.05 threshold used elsewhere, this should be reported as non-significant.
  2. [Section 4.4] The sentence "The detailed implementation is provided in These pre-questionnaire items are provided in the Appendix C" is a fragment and appears to be a merge error; it should read "The detailed implementation is provided in Appendix C."
  3. [Section 4.4] The Shapiro-Wilk results are described as "statistically insignificant" despite p-values below 0.05 (SCI: 0.0212, 0.0006, 0.0062; IJS: 0.0160, 0.0338); these are significant departures from normality and the wording is reversed.
  4. [References] Reference [6] contains a typo: "Social dialongue" should be "Social dialogue."
  5. [Section 3.3] The procedure allowed participants to review chat history while completing the intimacy measures; this could introduce a reflection or recency effect, and the decision to allow it should be justified or tested.
  6. [Section 4.1] The random assignment imbalances in Study 2 (more female participants in the unfit and non-blind conditions) are reported but not included as covariates; given the small cell sizes, the authors should discuss or adjust for this imbalance.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity found: the paper is an empirical study using external scales and fresh samples; its main inferential threat is a missing control condition, not a derivation that reduces to its own inputs.

full rationale

This paper makes no formal derivation and fits no parameters. The central claim that gradual self-disclosure increases perceived intimacy is supported by repeated-measures non-parametric tests (Friedman, ART ANOVA) on the SCI and IJS scales, which are external instruments from prior human-relationship research (Aron et al.; Berscheid et al.; Byrne). There is no equation in which the outcome is defined by the input, and no fitted quantity is later relabeled as a prediction. The strongest design concern is that all participants received the same progressively deepening question sequence with no static or reverse-order control, so 'stage' is confounded with elapsed time, question content, and familiarity. That is an internal-validity limitation and a valid target for future experiments, but it is not circularity: the observed rise in SCI is an empirical result that could have been null, and it does not reduce to the experimental setup by construction. Similarly, Study 2's self-criticism criteria were informed by Study 1's qualitative complaints, but Study 2 used a fresh participant sample and the perceived-naturalness and intimacy outcomes were measured rather than enforced by the manipulation; this is iterative design, not self-definition. No load-bearing self-citation, imported uniqueness theorem, or ansatz-smuggling-via-citation appears in the text. Accordingly, the honest finding is no significant circularity, with score 0.

Assumptions & free parameters 3 free parameters · 3 assumptions · 0 invented entities

The central claim relies on the Aron task, the persona construction formulas, and the hand-written self-criticism prompt. None of these are fitted to outcome data, so the ledger is small, but the self-criticism prompt bundles several style changes and the persona inversion formula is an arbitrary transformation.

free parameters (3)
  • Persona inversion formula (unfit condition) = Unfit score = |8 - user score| on a 7-point Likert scale
    Hand-chosen transformation to define the opposite persona; all 'unfit' personas depend on it. Located in Appendix B.2.
  • Neutral persona setting = 4 on all 17 Likert items, age 2000
    Arbitrary fixed persona; affects the neutral condition only. Located in Appendix B.2.
  • Self-criticism style constraints = Four 100% rules (omit subject, drop periods, no questions, empathy only on persona-aligned concerns) plus Gen-Z…
    Bundle of hand-chosen style changes in Fig. 3; the effect of 'naturalness' cannot be separated from these specific rules, so the self-criticism manipulation is a compound treatment.
assumptions (3)
  • domain assumption Social Penetration Theory: intimacy develops through mutual and gradual self-disclosure
    The paper's central manipulation and interpretation rely on this theory (Section 2.1, citing Altman 1973).
  • domain assumption Aron et al.'s 36-question fast-friends procedure creates closeness in human-human pairs
    The paper adapts this procedure to human-LLM chats and assumes graduated questions induce comparable dynamics (Section 3.3).
  • ad hoc to paper The 33 used questions form three monotonically deepening self-disclosure sets
    The division into three sets of 11 is the paper's own construction and is not validated; the depth ordering is assumed from the original Aron list (Section 3.3).

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Cite this review

Pith. "Pith review of Can LLMs and humans be friends? Uncovering factors affecting human-AI intimacy formation." pith.science (2026). https://pith.science/paper/QJZH4OXU

@misc{pith2026250524658,
  author       = {Pith},
  title        = {Pith review of: Can LLMs and humans be friends? Uncovering factors affecting human-AI intimacy formation},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/QJZH4OXU}},
  note         = {Machine review of arXiv:2505.24658}
}
read the original abstract

Large language models (LLMs) are increasingly being used in conversational roles, yet little is known about how intimacy emerges in human-LLM interactions. Although previous work emphasized the importance of self-disclosure in human-chatbot interaction, it is questionable whether gradual and reciprocal self-disclosure is also helpful in human-LLM interaction. Thus, this study examined three possible aspects contributing to intimacy formation: gradual self-disclosure, reciprocity, and naturalness. Study 1 explored the impact of mutual, gradual self-disclosure with 29 users and a vanilla LLM. Study 2 adopted self-criticism methods for more natural responses and conducted a similar experiment with 53 users. Results indicate that gradual self-disclosure significantly enhances perceived social intimacy, regardless of persona reciprocity. Moreover, participants perceived utterances generated with self-criticism as more natural compared to those of vanilla LLMs; self-criticism fostered higher intimacy in early stages. Also, we observed that excessive empathetic expressions occasionally disrupted immersion, pointing to the importance of response calibration during intimacy formation.

Figures

Figures reproduced from arXiv: 2505.24658 by the authors.

Figure 1
Figure 1. Chatroom interface used in the experiment consisted of two main components: (i) the chat thread (ii) the input box where [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Experimental workflow illustrating the examination of self-disclosure and intimacy during Human-LLM interactions, consisting [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Caption be applied after observing the responses of a human partner. Therefore, we used a fourth condition based on empathy alone when the LLM had to answer after the human partner’s response. Accordingly, we provided both the original Korean prompt and its English translation. 4.3 Procedure Although the procedure followed was similar to that in Study 1, we made subtle changes in the main experiment and post-intervi… view at source ↗

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Reference graph

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    참가인원및연령 만 19세 29세 사이의성인 남녀 90명을대상으로 하나,조기에종료될수있습니다. 3.실험의절차 이연구를위해우리는이미 사전설문조사를 통해 참가자인 당신의성향을파악했고,이것은 당신의페르소나가 됩니다.이후 당신과 참가자들의성향을고려하여파트너를 매칭했고,두 사람이 함께 참여하는종류의공유실험을 준비했습니다. 채팅을돕기위해제공되는총 33개질문이순차적으로제공될예정이며, 당신은파트너와질문에 해당하는 답변을 공유하는작업을 해주시면됩니다. 한질문에두 명의 피험자 모두가 답변해야 다음질문으로넘어갈수...

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    또한본연구 가진행되는동안귀하의 답변과, 매세트이후진행될설문에서의 답변이수집되지만,이정보는연구진을제외한 외부에공개되지않으며,연구종료 3년 후폐기됩니다.본연구팀에서는이연구를 통해얻은 모든정보를익명화하 여 분석하며, 학회지나 학회에발표할경우귀하를유추할수있는개인정보는 사용되지않을것입니다

    기밀유지와 피험자정보수집및 활용에대한검토 연구진행에앞서저희는 참가자들의성별및 나이에관한정보와 사전설문 내용을수집하게됩니다. 또한본연구 가진행되는동안귀하의 답변과, 매세트이후진행될설문에서의 답변이수집되지만,이정보는연구진을제외한 외부에공개되지않으며,연구종료 3년 후폐기됩니다.본연구팀에서는이연구를 통해얻은 모든정보를익명화하 여 분석하며, 학회지나 학회에발표할경우귀하를유추할수있는개인정보는 사용되지않을것입니다. 다만법이 요구하면귀하의개인정보가제공될수도있습니다. 또한 모니터요원,점검요원, 생명윤리위원회...

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    Number and Age Range of Participants We plan to recruit 90 male and female adults aged between 19 and 29. However, recruitment may end earlier

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    persona

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    Risks and Benefits The conversation prompts do not ask for any personally identifiable or sensitive information. Therefore, there is no expected risk to your safety or privacy. Aside from a gift voucher provided at the end of the study, there are no additional benefits

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    I believe that pursuing hobbies is important for my personal growth. (scale: {st.session_state.userInfo[16]}) We set the scale values in the above prompt differently for each of the three conditions: fit, unfit, and neutral. First, for the fit condition, we assigned a persona ...

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.