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Meta-Analyses

A curated collection of research papers focusing on meta-analyses. Explore the methodology, key findings, and ongoing debates in this field.

Total Papers 3

Year Range 2015 – 2024

Top Contributors

Tressoldi, PatrizioStorm, LanceTressoldi, P.E

Recent Publications

Stage 2 Registered Report: Anomalous Perception in a Ganzfeld Condition - A Meta-Analysis of More Than 40 Years Investigation

Tressoldi, P.E; Storm, L • 2024 • F1000Research

This Stage 2 Registered Report meta-analyzed 78 ganzfeld studies (113 effect sizes) from 1974-2020 involving 46 principal investigators. Both frequentist (REML with Knapp-Hartung adjustment) and Bayesian random-effects models yielded convergent estimates: ES ≈ 0.08 (95% CI [0.04, 0.12]; BF₁₀ = 89.5). Four publication bias tests (3PSM, p-uniform*, RoBMA, Mathur-VanderWeele sensitivity) indicated results are robust. Cumulative meta-analysis showed effect stabilization since 1997; meta-regression found no decline (slope = 0.0012, p = 0.53). Moderator analyses revealed selected participants produced ES = 0.13 vs. 0.04 for non-selected; telepathy-type tasks (Type 3) showed ES = 0.08 vs. 0.04 for clairvoyance (Type 2).

#ganzfeld #meta-analysis #registered-report #anomalous_perception #telepathy

Anomalous Cognition: An Umbrella Review of the Meta-Analytic Evidence

Tressoldi, Patrizio; Storm, Lance • 2021 • Journal of Anomalous Experience and Cognition

Umbrella review of 11 meta-analyses conducted between 1989 and 2021, encompassing 928 studies of anomalous cognition across six states of consciousness and three response types. All 16 reported effect sizes were statistically significant except for slow-thinking forced-choice precognition (ES = 0.03). Effect sizes ranged from 0.005 (forced-choice clairvoyance) to 0.39 (remote viewing free-response). State of consciousness and response type were strong moderators (Spearman rs = .81, p = 1.9 × 10⁻⁴): altered states with free-response protocols and physiological anticipation measures yielded the largest effects, while forced-choice paradigms in normal consciousness yielded the weakest. Between 54% and 81% of individual studies in most meta-analyses were non-significant, which the authors argue militates against questionable research practices.

#umbrella_review #anomalous_cognition #publication_bias #moderator_analysis #altered_states

Religious Priming: A Meta-Analysis With a Focus on Prosociality

Shariff, Azim F; Willard, Aiyana K; Andersen, Teresa; Norenzayan, Ara • 2015 • Personality and Social Psychology Review

Seven meta-analyses evaluated the robustness of religious priming effects across 93 studies (N = 11,653). Using effect-size analyses, p-curve analyses, and trim-and-fill publication-bias corrections, the review examined whether religious priming reliably alters psychological outcomes, promotes prosocial behavior, and extends to non-believers. Overall priming produced g = 0.40 (p < .0001), reduced to g = 0.29 after bias correction. Prosocial effects were smaller (g = 0.27, adjusted g = 0.18) but robust. P-curve analyses confirmed evidentiary value over p-hacking. Effects were confined to religious participants (g = 0.44) with no reliable effect on non-believers (g = 0.04, p = .71), suggesting priming depends on activation of culturally transmitted beliefs rather than universal low-level associations.

#religious_priming #prosocial_behavior #publication_bias #p_curve_analysis #replication_methodology

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