The enhanced processing account suggests that domain-specific expertise enhances the processing of information in that domain, such as enhanced color perception in visual artists and grapheme-color synaesthetes. A previous study (Ovalle-Fresa et al., 2021) found support for this account in both synaesthetes and non-synaesthete color experts; however, to fully understand the domain specificity of enhanced processing, other domains of expertise should be investigated and compared against each other in a double dissociation.

 

In this Stage 1 manuscript, Sachdeva et al. (2024) will investigate whether an enhanced processing account can explain domain-specific expertise in groups of color experts (i.e., visual artists) / grapheme-color synaesthetes and spatial experts (i.e., architects) / sequence-space synaesthetes. The spatial domain was chosen to compare to color since color and spatial processing recruit two distinctive cortical visual pathways: the ventral and dorsal streams, respectively. If enhanced processing is domain specific, then color experts / grapheme-color synaesthetes should show selective perceptual and memory performance enhancements for color tasks but not spatial tasks; and vice versa for spatial experts and sequence-space synaesthetes. The authors of this planned study further propose that perceptual performance should predict memory performance in the domain of expertise only; and that synaesthetes and non-synaesthetes with the same domain of expertise should perform similarly to each other.

 

To address these hypotheses, four independent groups will be recruited: grapheme-color synaesthetes, visual artists, sequence-space synaesthetes, and architects. Individuals with overlapping expertise and synaesthesia (e.g., visual artists who also have grapheme-color synaesthesia) will be excluded. Perception, short-term memory, and long-term memory for color (3 tasks) and space (3 tasks) will be assessed in all groups, and the authors will compare groups (synaesthetes, non-synaesthetes), domains of expertise (color, space), and task feature (color, space) in 2x2x2 linear mixed models. For all models, the authors predict that a significant interaction between domain of expertise and task feature will provide evidence for the domain specificity of the enhanced processing account. Additional analyses concerning working memory load (one, three, or five items) in the short-term memory tasks, and testing day (one, two, or three days post-training) in the long-term memory tasks, will be conducted to more deeply explore potential performance enhancements related to domain-specific expertise. Although these analyses may potentially provide additional evidence in favor of the hypothesized direction of effects, any deviation from predicted may pose a challenge for the interpretation of results. Nevertheless, this planned study is methodologically rigorous, and comprehensive in its aims.

 

The Stage 1 submission was evaluated by the recommender and two expert reviewers. Following revisions, the recommender judged that the manuscript met the Stage 1 criteria and awarded in-principle acceptance (IPA).

 

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. Ovalle-Fresa, R., Ankner, S., & Rothen, N. (2021). Enhanced perception and memory: Insights from synesthesia and expertise. Cortex, 140, 14-25. https://doi.org/10.1016/j.cortex.2021.01.024

2. Sachdeva, D. & Whelan, E., Ovalle-Fresa, R., Rey-Mermet, A., Ward, J., & Rothen, N.. (2024). How perceptual ability shapes memory: An investigation in healthy special populations. In principle acceptance of Version 2 by Peer Community in Registered Reports. https://osf.io/6wn4m

 

Recent studies using an EEG frequency tagging approach have reported modulations of alpha, beta and theta bands at the stimulation frequency during nociceptive/painful thermal stimulation compared to non-nociceptive/non-painful vibrotactile stimulation. Prior expectations of the intensity of upcoming painful stimuli are known to strongly modulate the subjective experience of those stimuli. Thus, modulating the expectation of pain should result in a change in the modulation of oscillations if these factors are indeed linked.

 

In this study, Leu, Glineur and Liberati modulated expectations of pain (low or high intensity) in 40 participants prior to delivering thermal cutaneous stimulation (low, medium or high intensity). They recorded how intense participants expected the pain to be, and how intense they felt it to be, as well as EEG to assess oscillatory differences across the expectation and intensity conditions.

 

The results confirmed that there was a strong effect of expectation on the perceived stimulus intensity. However, contrary to the hypotheses, this was not reflected in the cortical oscillations. Overall this indicates a possible dissociation between perceived pain and modulation of ongoing oscillations in the theta, alpha and beta bands. 

 

The Stage 2 manuscript was evaluated over one round of in-depth review. Based on detailed responses to the reviewers' comments, the recommender judged that the manuscript met the Stage 2 criteria and awarded a positive recommendation.

 

URL to the preregistered Stage 1 protocol: https://osf.io/y6fb8
 
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:

 

• Advances in Cognitive Psychology
• F1000Research
• Brain and Neuroscience Advances
• Cortex
• Imaging Neuroscience
• In&Vertebrates
• NeuroImage: Reports
• Peer Community Journal
• PeerJ
• Psychology of Consciousness: Theory, Research and Practice
• Studia Psychologica
• Royal Society Open Science
   

References
 
1. Leu, C., Glineur, E. & Liberati, G. (2023). Cue-based modulation of pain stimulus expectation: do ongoing oscillations reflect changes in pain perception? [Stage 2] Acceptance of Version 2 by Peer Community in Registered Reports. https://osf.io/awrge

Rhythmic changes in pain can lead to corresponding modulations of EEG amplitudes in theta, alpha, and beta bands. But the question remains open as to whether these modulations are actually tracking pain, or maybe rather saliency or stimulus intensity. The question is of some importance because a marker of pain per se could be useful for tracking felt pain without a verbal response, and could be useful in investigating interventions for treating pain (such as suggestion).  Here, Leu et al. (2025) addressed the question of whether modulations reflect saliency or else the intensity of pain, by using an oddball paradigm in which most trials are a pain stimulus of a certain intensity, and oddball trials will sometimes occur, at either a higher intensity or a lower intensity than the baseline ones. If the modulations reflected salience, the modulation at the frequency of the oddball would be similar for high and low intensity oddballs. However, if the modulations reflected pain intensity, the modulations for the low rather than high oddball condition would be lower.

 

In fact, the baseline and oddball stimulations were found to be perceived significantly differently only in the high oddball condition; and consistantly, the oddballl stimulus significantly modulated ongoing oscillations in only the high oddball condition. Thus, whether oscillations are modulated by pain intensity or salience could not be picked apart in this study. The study does however raise an important isssue, indicate how it could be addressed, and provide data relevant for clearly resolving the issue in the future.

 

The Stage 2 manuscript was evaluated over two rounds of in-depth peer review. Based on detailed responses to the reviewers' comments, the recommender judged that the manuscript met the Stage 2 criteria for acceptance.

 

URL to the preregistered Stage 1 protocol: https://osf.io/qbrf2
 
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. Leu, C., Forest, S., Legrain, V., & Liberati, G. (2025). The effect of stimulus saliency on the modulation of pain-related ongoing neural oscillations: a Registered Report [Stage 2]. Acceptance of Version 3 by Peer Community in Registered Reports. https://osf.io/98edq

When receiving a favor, we may feel grateful and/or indebted to those who have helped us. What factors determine the extent of gratitude and indebtedness people experience? In a seminal paper, Tsang (2006) found that people reported feeling more gratitude when the helper's intention was perceived to be benevolent rather than selfish. In contrast, indebtedness was not influenced by the perceived intention of the helper.

In the current study, Chan et al. (2025) revisited the effects of helper intention on gratitude and indebtedness, by replicating and extending the original studies (Study 2 & 3) by Tsang (2006). Participants were asked to either recall (replication of Study 2) or read (replication of Study 3) a scenario in which another person helped them with either benevolent or selfish intentions, and rate how much gratitude and indebtedness they would experience in such situations. Replicating the findings by Tsang (2006), Chan et al. (2025) found that gratitude was more strongly influenced by helper intention than indebtedness. Extending these findings, the authors further discovered that helper intention affected perceived expectations for reciprocity and reciprocity inclination. Moreover, perceived reciprocity expectations showed opposite correlations with gratitude and indebtedness. Overall, this successful replication reinforces the distinction between gratitude and indebtedness, providing a solid foundation for future research on their underlying mechanisms and downstream influences.

This Stage 2 manuscript was evaluated over one round of in-depth review by three 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 therefore awarded a positive recommendation.

 

URL to the preregistered Stage 1 protocol: https://osf.io/uyfvq
 
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. Tsang, J.-A. (2006). The effects of helper intention on gratitude and indebtedness. Motivation and Emotion, 30, 199–205. https://doi.org/10.1007/s11031-006-9031-z

2. Chan, C. F., Lim, H. C., Lau, F. Y., Ip, W., Lui, C. F. S., Tam, K. Y. Y., & Feldman, G. (2025). Revisiting the Effects of Helper Intention on Gratitude and Indebtedness: Replication and extensions Registered Report of Tsang (2006)[Stage 2]. Acceptance of Version 6 by Peer Community in Registered Reports. https://osf.io/gthma

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 used an online design in 201 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).

 

Results showed mixed support for the hypotheses. Contrary to expectations, the relationship between creativity and depression was significantly negative rather than positive. However, even though the directionality of this relationship was opposite to predicted, the hypothesis that the association between creativity and depression is mediated by self-reflective rumination was supported. Finally, the results disconfirmed the hypothesis that reappraisal frequency contributes to the relationship between creativity and depression. Exploratory analyses indicated no reliable moderating role of gender. Overall, these findings suggest that creativity and depression may be only weakly related, and that self-reflective rumination could account for that relationship.

 

The Stage 2 manuscript was evaluated over one round of review provided by the recommender and Managing Board, as the Stage 1 reviewers were no longer available. Based on additional changes to the manuscript, the recommender judged that the manuscript met the Stage 2 criteria and awarded a positive recommendation.

 

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 was used to answer the research question was 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, 226-232. https://doi.org/10.1037/1528-3542.5.2.226

 

2. Lam, C. Y. & Saunders, J. A. (2023). Relationship between creativity and depression: the role of reappraisal and rumination [Stage 2 Registered Report]. Acceptance of Version 2 by Peer Community in Registered Reports. https://osf.io/z3ap5