The world is seemingly awash with conspiracy theories – from well-trodden examples such as fake Moon landings, the 9/11 truth movement, and Holocaust denial, to relative newcomers including COVID as a bioweapon, QAnon, and the belief that the science of climate change has been invented or falsified. While there is a public perception that conspiracy theories are becoming more prevalent, recent evidence suggests that the rate of conspiracism is relatively stable over time (Uscinski et al., 2022). At any point in history, it seems that a certain proportion of people find themselves vulnerable to conspiracy beliefs, but what distinguishes those who do from those who don’t, and what are the causal factors?

 

In the current study, Liekefett et al. (2023) investigate the critical role of rumination – a perseverative and repetitive focus on negative content leading to emotional distress. In particular, the authors ask whether one component of rumination referred to as brooding (dwelling on one’s worries and distressing emotions) has a specific causal role in the formation of conspiracy beliefs. In a series of preliminary experiments, the authors first established a procedure for successfully inducing rumination, identifying various boundary conditions and requirements for a successful design. In the proposed study (of up to N=1,638), they will then ask whether the induction of brooding causes a significant increase in conspiracy beliefs. Manipulation checks will be included to confirm intervention fidelity (independently of this hypothesis), and exploratory analyses will test the effect of various moderators, as well as the causal role of a complementary manipulation of reflection – a component of rumination in which attention is focused on the issue at hand rather than one’s emotions.

 

The Stage 1 manuscript was evaluated over two rounds of in-depth review. Based on detailed responses to the reviewers' comments, the recommender judged that the manuscript met the Stage 1 criteria and therefore awarded in-principle acceptance (IPA).

 

URL to the preregistered Stage 1 protocol: https://osf.io/y82bs
 
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:
 

• Advances in Cognitive Psychology
• Experimental Psychology
• Journal of Cognition
• Peer Community Journal
• PeerJ
• Royal Society Open Science
• Swiss Psychology Open

 

References
 

1. Uscinski, J., Enders, A., Klofstad, C., Seelig, M., Drochon, H., Premaratne, K. & Murthi, M. (2022) Have beliefs in conspiracy theories increased over time? PLOS ONE 17: e0270429. https://doi.org/10.1371/journal.pone.0270429

2. Liekefett, L. Sebben, S. & Becker, J. C. (2023). Does Brooding Meaningfully Increase the Likelihood of Believing in a Conspiracy? Stage 1 Registered Report, in principle acceptance of Version 3 by Peer Community in Registered Reports. https://osf.io/y82bs

A convergence of evidence suggests that early life adversity may cause dysfunction in opioid-sensitive reward systems. Childhood adversity is associated with opioid use, potentially by altering reward and motivation networks, and experimental models in animals have found that early life adversity increases and consolidates opioid seeking behaviours. Further, in a recent controlled experiment, Carlyle et al. (2021) found that opioid administration produced stronger positive responses, and weaker negative responses, in adults with a history of childhood abuse and neglect.

 

In the current study, Carlyle et al. (2023) tested the generalisability of these previous findings in a pre-operative clinical setting. Using partially observed data from an existing cohort study (N=155), the authors asked whether patients with greater experience of childhood trauma in turn exhibit a larger mood boost and express greater subjective pleasure following opioid administration.

 

In contrast to previous findings, the results did not support the hypotheses that more experiences of childhood adversity would heighten ratings of drug liking and feeling good following opioid administration. Regression analyses instead revealed a statistically significant negative association between childhood adversity and post-opioid liking and no significant relationship with feeling good. The authors suggest that the discrepancy between the current and previous results may be due to stress related to the pre-surgical setting, the brief duration of drug exposure, and the relatively limited levels of high childhood adversity in the study sample. Nevertheless, these findings cast some doubt on the theory that adversity elevates risk of opioid addiction by altering sensitivity to subjectively pleasurable effects.

 

Following one round of in-depth review, 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/7ymts
 
Level of bias control achieved: Level 2. At least some data/evidence that was used to answer the research question had been accessed and partially observed by the authors prior to IPA, but the authors certify that they had not yet observed the key variables within the data that were used to answer the research question AND they took additional steps to maximise bias control and rigour. 

 

List of eligible PCI RR-friendly journals:
 

 

1. Carlyle M., Broomby R., Simpson G., Hannon R., Fawaz L., Mollaahmetoglu O.M., Drain, J., Mostazir, M., & Morgan C. (2021). A randomised, double‐blind study investigating the relationship between early childhood trauma and the rewarding effects of morphine. Addiction Biology, 26(6):e13047. https://doi.org/10.1111/adb.13047

 

2. Carlyle, M., Kvande, M., Meier, I. M., Trøstheim, M., Buen, K., Jensen, E. N., Ernst, G. & Leknes, S. & Eikemo, M. (2023). Does childhood adversity alter opioid drug reward? A conceptual replication in outpatients before surgery, acceptance of Version 2 by Peer Community in Registered Reports. https://osf.io/9kt3a?view_only=4238d2ee3d654c4f908a94efea82a027

‘Pseudoneglect’ is a small, lateralised bias of visuospatial attention towards the left side of space, and is typically observed in healthy adults. Recently, Strauch et al. (2022) reported that bright stimuli presented in the left visual field induced a greater constriction of the pupil (the pupillary light reflex) compared to the same bright stimuli presented in the right visual field. Further, the pupillary restriction bias was positively correlated with a behavioural measure of pseudoneglect (the greyscales task). This is potentially an important development for attention research, because the passive nature of the task, in addition to the ability to track the time course of the bias measures, could provide a new, and highly sensitive, method of studying spatial attention.

 

In this report, Burns and McIntosh (2023) aim to replicate and extend the study of Strauch et al. (2022). The extension centres around investigating whether the pupillary biases are influenced by recording pupillary responses from the right or left eye. In their pilot replication data, Burns & McIntosh identified a larger constriction in response to stimuli on the right side when recording from the right eye. They hypothesise that pupillary biases may be stronger to stimuli presented in the ipsilateral, rather than contralateral, side of space.

 

The Stage 1 manuscript was reviewed over 2 rounds by 2 reviewers, including the authors of the study being replicated. Based on detailed responses to the reviewers’ comments and edits to the Stage 1 report, the recommender judged that the manuscript met the Stage 1 criteria and therefore awarded in-principle acceptance.

 

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. Strauch, C., Romein, C., Naber, M., Van der Stigchel, S. & Ten Brink, A. F. (2022). The orienting response drives pseudoneglect—Evidence from an objective pupillometric method. Cortex, 151, 259-271.

 
2. Burns, N. E. & McIntosh, R. D. (2023). Does pupillometry provide a valid measure of spatial attentional bias (pseudoneglect)? In principle acceptance of Version 2 by Peer Community in Registered Reports. https://osf.io/ua9jn

As virtual reality environments become more common, it is important to understand our sensorimotor interactions with them. In real world settings, sensory information is supplemented by prior expectations from past experiences, aiding efficient action control. In VR, the relative role of expectations could decrease due to a lack of prior experience with the environment, or increase because sensory information is impoverished or ambiguous. Harris, Arthur and Buckingham (2024) propose to test these possibilities by comparing a real-world object lifting task and a VR version in which the same objects are lifted but visual feedback is substituted by a virtual view. The experiment uses the Size-Weight Illusion (SWI) and the Material Weight Illusion (MWI). In these paradigms, the visual appearance of the object induces expectations about weight that can affect the perception of weight during lifting, and the fingertip forces generated. The degree to which the visual appearance of objects induces differences in perceived weight, and in measured fingertip forces, will index the influence of prior expectations for these two paradigms. The analyses will test whether the influence of prior expectations is lower or higher in the VR set-up than in real-world lifting. The outcomes across tasks (SWI and MWI) and measures (perceived weight, fingertip forces) will broaden our understanding of the role of predictive sensorimotor control in novel virtual environments.

 

After three rounds of evaluation, with input from two external reviewers, the recommender judged that the Stage 1 manuscript met the criteria for 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:

 

• Advances in Cognitive Psychology
• Collabra: Psychology
• Communications in Kinesiology
• Experimental Psychology
• In&Vertebrates
• Journal of Cognition
• Peer Community Journal
• PeerJ
• Psychology of Consciousness: Theory, Research, and Practice
• Royal Society Open Science
• Studia Psychologica
• Swiss Psychology Open

 
References

 

1. Harris, D. J., Arthur, T., & Buckingham, G. (2024). Does ‘virtuality’ affect the role of prior expectations in perception and action? Comparing predictive grip and lifting forces in real and virtual environments. In principle acceptance of Version 4 by Peer Community in Registered Reports. https://osf.io/36jhb

 

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