Peer Review History
| Original SubmissionJanuary 19, 2026 |
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--> PONE-D-26-02739 Revisiting the relationship between impulsivity, apathy, and action control: Bayesian inference from a stop-signal task study PLOS One Dear Dr. Servant, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. Please submit your revised manuscript by Apr 25 2026 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org. When you’re ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file. Please include the following items when submitting your revised manuscript:
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Kind regards, Yansong Li Academic Editor PLOS One Journal Requirements: When submitting your revision, we need you to address these additional requirements. 1. Please ensure that your manuscript meets PLOS ONE's style requirements, including those for file naming. The PLOS ONE style templates can be found at https://journals.plos.org/plosone/s/file?id=wjVg/PLOSOne_formatting_sample_main_body.pdf and 2. Thank you for stating the following financial disclosure: “This work was funded by the HORIZON EUROPE European Research Council (ERC Starting Grant 101039226 allocated to Mathieu Servant).” Please state what role the funders took in the study. If the funders had no role, please state: 'The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.' If this statement is not correct you must amend it as needed. Please include this amended Role of Funder statement in your cover letter; we will change the online submission form on your behalf. 3. We note that you have referenced (Lynam, D. R., Smith, G. T., Whiteside, S. P., & Cyders, M. A. (2006). The UPPS-P: Assessing Five Personality Pathways to Impulsive Behavior [Technical report or Unpublished manual]. Purdue University) which has currently not yet been accepted for publication. Please remove this from your References and amend this to state in the body of your manuscript: (ie “Bewick et al. [Unpublished]”) as detailed online in our guide for authors http://journals.plos.org/plosone/s/submission-guidelines#loc-reference-style 4. Please ensure that you refer to Figure 4 in your text as, if accepted, production will need this reference to link the reader to the figure. 5. If the reviewer comments include a recommendation to cite specific previously published works, please review and evaluate these publications to determine whether they are relevant and should be cited. There is no requirement to cite these works unless the editor has indicated otherwise. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented. Reviewer #1: Yes Reviewer #2: Yes Reviewer #3: Yes --> ********** --> 2. Has the statistical analysis been performed appropriately and rigorously? Reviewer #1: Yes Reviewer #2: Yes Reviewer #3: Yes --> ********** --> 3. Have the authors made all data underlying the findings in their manuscript fully available? The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified. Reviewer #1: Yes Reviewer #2: Yes Reviewer #3: No --> ********** --> 4. Is the manuscript presented in an intelligible fashion and written in standard English? PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here. Reviewer #1: Yes Reviewer #2: Yes Reviewer #3: Yes --> ********** --> 5. Review Comments to the Author Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters) Reviewer #1: In this article, the authors question the existence of a dopaminergic continuum whose opposite ends would be apathy and impulsivity. To this end, apathy and impulsivity were assessed using dedicated scales in a large group of young healthy subjects. Their scores were correlated with performance on a stop-signal reaction time (SSRT) task. The authors hypothesized that impulsivity would be associated with reaction times on stop trials, whereas apathy would be associated with reaction times on go trials. Bayesian methods were used to explore these relationships. The authors report a positive association between impulsivity and apathy, which contradicts the hypothesis of opposite ends of a continuum. Overall, the results do not confirm their initial hypotheses. The manuscript is clearly written, and the study addresses an interesting and relevant question. Importantly, the authors report negative findings, which are valuable for the field and may help guide future research. However, several issues need to be addressed. 1°) The authors contrast impulsivity (a personality trait that is not necessarily pathological) with apathy (a lack of motivation typically associated with neurological and psychiatric disorders). In addition, apathy was assessed using the Lille Apathy Rating Scale (LARS), which was originally developed to detect and measure the severity of apathy in clinical populations. Its use in a healthy sample may therefore require further justification, as it extends beyond its initial validation context. The Apathy Motivation Index (AMI) would have been an interesting alternative, as it was specifically developed to measure motivation levels in both healthy individuals and patients. The authors state that the AMI has not been validated in French; however, it appears that a French validation has been published (Corveleyn et al., Frontiers in Psychology, 2023). Moreover, the UPPS-P scale assesses a stable personality trait without a specific reference period, whereas the LARS refers to behaviors experienced over the past month and therefore captures a more state-like dimension. The implications of combining trait and state measures should be more explicitly discussed. 2°) The authors’ repeated reference to apathy (a pathological state) throughout the article is problematic. They studied healthy young volunteers whose motivation levels may vary, but likely none—or only a few—would be considered clinically apathetic. Furthermore, providing a table summarizing the demographic characteristics of the sample, along with the total and subscale scores for both instruments, would greatly enhance transparency and interpretability. At present, only correlation coefficients are reported, which makes the results difficult to interpret. 3°) In the discussion, in the section entitled “Trait dimensions do not map onto stop-signal indices,” the authors state that they explored the association between trait dimensions and performance on the SSRT task. While this is accurate for impulsivity (as the UPPS-P assesses a general tendency to act impulsively), it is not the case for apathy. The LARS does not assess a stable trait but rather a current behavioral state that is not necessarily related to personality. Although overall motivation levels vary between individuals, the LARS does not measure this as a trait dimension. This issue should be explicitly discussed. 4°) Although the authors mention some limitations, they should include a dedicated paragraph providing a more systematic discussion. For example, the very high proportion of women in the study population may have biased the results, as a substantial body of literature indicates sex differences in impulse control, with impulsivity generally being more frequent in men than in women. Addressing this point would further contextualize the findings. 5°) A major issue with the selected task is the absence of any reward component, despite the fact that both impulsivity and motivation are strongly related to reward processing. Impulsivity includes, among other features, increased reward-seeking and risk-taking behaviors. Similarly, apathy reflects a reduction in goal-directed behavior, which is largely driven by reward sensitivity. The absence of reward contingencies may have reduced the likelihood of observing meaningful associations. This important limitation is not mentioned by the authors and should be discussed in depth, as it may account for the negative results. 6°) Several redundancies (e.g., repeated paragraphs in the Introduction and Discussion or in the Methods and Results sections) could be streamlined to improve conciseness of the manuscript. Reviewer #2: This is a well-executed study addressing a genuine gap in the literature, with satisfactory methodological rigor. The null findings are reported responsibly with appropriate Bayesian quantification. The main revisions needed before acceptance are: (1) Explicit prior specification for Bayesian analyses. The manuscript does not report which prior distributions were used in the Bayesian Kendall correlation analyses. (2) A discussion of multiple comparisons in the exploratory section. The exploratory analyses involve multiple separate correlation tests, yet the paper does not acknowledge how this affects the interpretation of the single positive result found. The goRT-negative urgency finding should be clearly framed as hypothesis-generating, and readers should be left with a sense of its evidential status relative to the paper's pre-specified hypotheses. (3) More prominent acknowledgment of the highly female-skewed sample as a generalizability constraint. (4) Provision of descriptive stop-signal performance statistics. The results section does not report basic descriptive statistics for the stop-signal task, including mean SSRT, mean goRT, mean stop-signal delay, etc. These values are necessary for readers to verify that the task performed as intended or to compare with prior studies. Reviewer #3: The study by Michel et al. investigates the relationship between impulsivity, apathy, and inhibitory control using a well-powered stop-signal task, combined with validated multidimensional measures of impulsivity (UPPS-P) and apathy (LARS), and analyzed within a Bayesian framework. The study is carefully designed, adheres to current methodological recommendations, and provides a clear and rigorous test of theoretically motivated hypotheses, alongside transparent exploratory analyses. Importantly, the findings contribute to the literature by delineating the limits of task-based measures in dissociating impulsivity and apathy in healthy individuals. I found this manuscript to be well written, methodologically sound, and theoretically well grounded. I have no major concerns regarding the study design, analyses, or interpretation of the results. My comments below are therefore limited to minor points, mainly aimed at improving clarity, transparency, and readability. 1) A large number of analyses are reported, including several exploratory ones. Although the results are carefully presented, the overall pattern may be difficult to grasp for the reader. I think it would be helpful if the authors provided a graphical summary of the main results, in the spirit of the hypothesis-driven schematic shown in Fig.1, to offer an integrated overview of the key findings. 2) The authors state that the stop-signal task was implemented in accordance with the consensus recommendations (Verbruggen et al., 2019). In this context, it would be important to also report the descriptive statistics specified in these guidelines. In particular, stop-signal studies are expected to report the probability of go omissions, the probability of choice errors on go trials, mean goRT, the probability of responding on stop trials, the average SSD (given the use of a tracking procedure), mean stop-signal RT, and the RT of go responses on unsuccessful stop trials. Reporting these descriptive statistics, for instance in a Table, would improve transparency and facilitate comparison with previous studies. 3) Related to my previous point, although individual values are shown for the total LARS and UPPS-P scores (Fig. 2A) and for some subscales (Fig. 3B), it would be informative to also report the mean ± SD for all subscale scores. --> ********** --> 6. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy. Reviewer #1: No Reviewer #2: No Reviewer #3: Yes: Cecilia Neige --> ********** --> [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] To ensure your figures meet our technical requirements, please review our figure guidelines: https://journals.plos.org/plosone/s/figures You may also use PLOS’s free figure tool, NAAS, to help you prepare publication quality figures: https://journals.plos.org/plosone/s/figures#loc-tools-for-figure-preparation. NAAS will assess whether your figures meet our technical requirements by comparing each figure against our figure specifications. --> |
| Revision 1 |
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Revisiting the relationship between impulsivity, apathy, and action control: Bayesian inference from a stop-signal task study PONE-D-26-02739R1 Dear Dr. Matthieu Béreau, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. For questions related to billing, please contact billing support. If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Yansong Li Academic Editor PLOS One Additional Editor Comments (optional): Reviewers' comments: |
| Formally Accepted |
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PONE-D-26-02739R1 PLOS One Dear Dr. Servant, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS One. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset You will receive further instructions from the production team, including instructions on how to review your proof when it is ready. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few days to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. You will receive an invoice from PLOS for your publication fee after your manuscript has reached the completed accept phase. If you receive an email requesting payment before acceptance or for any other service, this may be a phishing scheme. Learn how to identify phishing emails and protect your accounts at https://explore.plos.org/phishing. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS ONE and supporting open access. Kind regards, PLOS ONE Editorial Office Staff on behalf of Dr. Yansong Li Academic Editor PLOS One |
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