The reward value of a stimulus is based on an error in prediction: Things going better than predicted. Could this learning principle, often tested on short acting stimuli, also apply to a long lasting episode, like going for a run? Could how rewarding a run is be based on the run going better than predicted?

 

Understanding the conditions under which exercise is pleasurable could of course be relevant to tempting people to do more of it! In the current study, Brevers et al. (2024) asked people before a daily run to predict the amount of perceived exertion they would experience; then just after the run, to rate the retrospective amount of perceived exertion actually experienced. The difference between the two ratings was the prediction error. Participants also rated their remembered pleasure in running. As hypothesized, the authors found that running pleasure increased linearly with how much retrospective exertion was than predicted.
 
The Stage 2 manuscript received one round of review from two external reviewers, then some minor comments from the recommender, after which it was judged to satisfy the Stage 2 criteria and was awarded a positive recommendation.

 

URL to the preregistered Stage 1 protocol: https://osf.io/xh724
 
Level of bias control achieved: Level 6. No part of the data or evidence that was used to answer the research question was generated until after IPA.
 
List of eligible PCI RR-friendly journals:
 

 

References
 
1. Brevers, D., Martinent, G., Oz, I. T., Desmedt, O. & de Geus, B. (2024). Do prediction errors of perceived exertion inform the level of running pleasure? [Stage 2]. In principle acceptance of Version 3 by Peer Community in Registered Reports. https://osf.io/xfgqp

Note from the PCI RR Managing Board: This Stage 1 recommendation was originally written by Esther Sebastián González for PCI Ecology on 06 Oct 2020 and was transferred to PCI Registered Reports on 14 Jan 2025 to facilitate the submission and evaluation of the resulting Stage 2 submissions. The link to the original recommendation and review history at PCI Ecology may be found at this link (and in PDF format here).

 

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Understanding the relative importance of species-specific traits and environmental factors in modulating species distributions is an intriguing question in ecology [1]. Both behavioral flexibility (i.e., the ability to change the behavior in changing circumstances) and habitat availability are known to influence the ability of a species to expand its geographic range [2,3]. However, the role of each factor is context and species dependent and more information is needed to understand how these two factors interact. In this pre-registration, Logan et al. [4] explain how they will use Great-tailed grackles (Quiscalus mexicanus), a species with a flexible behavior and a rapid geographic range expansion, to evaluate the relative role of habitat and behavior as drivers of the species’ expansion [4]. The authors present very clear hypotheses, predicted results and also include alternative predictions. The rationales for all the hypotheses are clearly stated, and the methodology (data and analyses plans) are described with detail. The large amount of information already collected by the authors for the studied species during previous projects warrants the success of this study. It is also remarkable that the authors will make all their data available in a public repository, and that the pre-registration in already stored in GitHub, supporting open access and reproducible science. I agree with the three reviewers of this pre-registration about its value and I think its quality has largely improved during the review process. Thus, I am happy to recommend it and I am looking forward to seeing the results.

 

 

Level of bias control achieved: Level 1. At least some of the data/evidence that will be used to the answer the research question has been accessed and observed by the authors, including key variables, but the authors certify that they have not yet performed any of their preregistered analyses, and in addition they have taken stringent steps to reduce the risk of bias.
 
List of eligible PCI-RR-friendly journals:
 

 

 

[1] Gaston KJ. 2003. The structure and dynamics of geographic ranges. Oxford series in Ecology and Evolution. Oxford University Press, New York.

 

[2] Sol D, Lefebvre L. 2000. Behavioural flexibility predicts invasion success in birds introduced to new zealand. Oikos. 90(3): 599–605. https://doi.org/10.1034/j.1600-0706.2000.900317.x

 

[3] Hanski I, Gilpin M. 1991. Metapopulation dynamics: Brief history and conceptual domain. Biological journal of the Linnean Society. 42(1-2): 3–16. https://doi.org/10.1111/j.1095-8312.1991.tb00548.x

 

[4] Logan CJ, McCune KB, Chen N, Lukas D. 2020. Implementing a rapid geographic range expansion - the role of behavior and habitat changes (http://corinalogan.com/Preregistrations/gxpopbehaviorhabitat.html) In principle acceptance by PCI Ecology of the version on 16 Dec 2021 https://github.com/corinalogan/grackles/blob/0fb956040a34986902a384a1d8355de65010effd/Files/Preregistrations/gxpopbehaviorhabitat.Rmd

 

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Full review history: [link]

 

Surveys that measure self-report are a workhorse in psychology and the social sciences, providing a vital window into beliefs, attitudes, and emotions, both at the level of groups and individuals. The validity of self-report data, however, is an enduring methodological concern, with self-reports vulnerable to a range of response biases, including (among others) the risk of social desirability bias in which, rather than responding honestly, participants answer questions in a way that they believe will be viewed favorably by others. One proposed solution to socially desirable responding is the so-called Bayesian Truth Serum (BTS), which aims to incentivize truthfulness by taking into account the relationship between an individual’s response and their belief about the dominant (or most likely) response given by other people and then assigning a high truthfulness score to answers that are surprisingly common (Prelec, 2004).

Although valid in theory (under a variety of assumptions), questions remain regarding the empirical utility of the BTS. One area of concern is participants’ uncertainty regarding incentives for truth-telling – if participants don’t understand the extent to which telling the truth is in their own interests (or they don’t believe that it matters) then the validity of the BTS is undermined. 

In the current study, Neville and Williams (2025) tested the role of clarifying incentives, particularly for addressing social desirability bias when answering sensitive questions. The authors administered an experimental survey design (N=877) including sensitive questions, curated from validated scales, that are relevant to current social attitudes and sensitivities (e.g., “Men are not particularly discriminated against”, “Younger people are usually more productive than older people at their jobs”). Three groups of participants completed the survey under different incentive conditions: the BTS delivered alone in a standard format, the BTS with an interim bonus payment that is awarded to participants (based on their BTS score) halfway through the survey to increase certainty in incentives, and a Regular Incentive control group in which participants receive payment without additional incentives.

The authors analyzed the effectiveness of the BTS through two registered hypotheses. First, the authors found that the BTS did not increase agreement with socially undesirable statements (compared to the control group), as theory would suggest, and even observed an opposite effect. This result, which could be confirmed by follow-up studies, raises some concerns about the robustness of the BTS method. Second, the authors conjectured that introducing an interim payment in the BTS mechanism would help reinforce its credibility in the eyes of the participants and would thus magnify its effect. However, the authors failed to detect a statistically significant difference between the standard BTS and interim-payment BTS mechanisms. Overall, the results of Neville and Williams (2025) call for some caution in the use of the BTS and for further work to better understand the contexts in which the BTS might be a useful tool to mitigate social desirability in surveys. 

This Stage 2 manuscript was evaluated over one round of in-depth review by two expert reviewers and a second round of review by the recommender. After the revisions, the recommender judged that the manuscript met the Stage 2 criteria and awarded a positive recommendation.

 

 

Level of bias control achieved: Level 6. No part of the data or evidence that was used to answer the research question was generated until after IPA.
 
List of eligible PCI-RR-friendly journals:

 

 

1. Neville, C. M & Williams, M. N. (2025). Does Truth Pay? Investigating the Effectiveness of the Bayesian
Truth Serum with an Interim Payment: A Registered Report [Stage 2]. Acceptance of Version 4 by Peer Community in Registered Reports. https://doi.org/10.31219/osf.io/s3znc

 

2. Prelec, D. (2004). A Bayesian truth serum for subjective data. Science, 306, 462-466. https://doi.org/10.1126/science.1102081

Language production is associated with a distinct lateralised pattern of brain activation biased toward the left cerebral hemisphere. This also applies to writing. It has also been shown to be modulated by handedness, with less pronounced lateralisation in left-handers. However, in recent decades the use of handwriting has declined significantly while the use of smartphones has exploded. To date, no study has explored whether the same neural correlates of written language production found for handwriting also hold for typing on a smartphone.

 

In the current study, Samsouris et al. (2023) will use functional transcranial Doppler ultrasound (fTCD) to measure blood flow velocity within cerebral hemispheres to investigate this question. This technique is particularly suited for this purpose because it provides better control for the movement confounds associated with a writing task and the technical challenges of using a smart device than other neuroimaging techniques like fMRI or M/EEG. The authors hypothesise that there will be no difference in left cerebral lateralisation for handwriting and typing on a smartphone. They also expect to replicate previous findings of weaker lateralisation in left-handers in written language production when typing on a smartphone. To isolate the effect of written language production, both these conditions will be corrected for their corresponding motor component using control conditions without a linguistic component.

 

The Stage 1 manuscript was evaluated over 6 rounds of in-depth review by the recommender and two expert reviewers, before issuing in-principle acceptance.

 

URL to the preregistered Stage 1 protocol: https://osf.io/j7egz
 
Level of bias control achieved: Level 6. No part of the data or evidence that will be used to answer the research question yet exists and no part will be generated until after IPA.
 
List of eligible PCI RR-friendly journals:
 

 

1. Samsouris, C., Badcock, N. A., Vlachos, F., & Papadatou-Pastou, M. (2023). Cerebral laterality as assessed by functional transcranial Doppler ultrasound in left-and right-handers: A comparison between handwriting and writing using a smartphone. In principle acceptance of Version 7 by Peer Community in Registered Reports. https://osf.io/j7egz

For centuries, the relationship between creativity and mental health has been a subject of fascination, propelled by the impression that many of the most famous artists in history likely suffered from mood disorders or other mental illnesses. However, with the advent of psychological science – including more precise and diagnostic clinical measures – the empirical evidence for an association between creativity and depressive symptoms has been mixed, with some studies suggesting a positive relationship and others showing either no effect or indicating that the link, if there is one, may be driven by other personality characteristics (Verhaeghen et al., 2005).

 

In the current study, Lam and Saunders will use an online design in 200 participants to ask whether creativity is associated with higher depressive traits, and further, whether that relationship depends on two additional variables that could explain an observed positive correlation: self-reflective rumination (repetitive thoughts that maintain a negative mood state) and the frequency with which individuals engage in reappraisal (a regulation strategy that involves reinterpreting an event or situation to diminish its negative impact). If justified by the main confirmatory findings, the authors will also explore the moderating role of gender and how any observed associations are reflected in more fine-grained measures of creativity. The results promise to shed light on not only the basic question of whether creativity is related to depressive traits, but the extent to which that association depends on related determinants of mental health.

 

Following two rounds of in-depth review, the recommender judged that the manuscript met the Stage 1 criteria and awarded in-principle acceptance (IPA).  

 

URL to the preregistered Stage 1 protocol: https://osf.io/yub7n
 
Level of bias control achieved: Level 6. No part of the data or evidence that will be used to answer the research question yet exists and no part will be generated until after IPA. 
 
List of eligible PCI RR-friendly journals:
 

References
 

1. Verhaeghen, P., Joormann, J., & Khan, R. (2005). Why we sing the blues: The relation between self-reflective rumination, mood, and creativity. Emotion, 5(2), 226-232. https://doi.org/10.1037/1528-3542.5.2.226

 

2. Lam, C. Y. & Saunders, J. A. (2022). Relationship between creativity and depression: the role of reappraisal and rumination, in principle acceptance of Version 3 by Peer Community in Registered Reports. https://osf.io/yub7n