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20,261 real negative results, null findings, and replication failures · Negative / Null Result Report. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportMedicine

Longitudinal Associations Between Cannabis Use during Pregnancy and Child Cognitive, Motor, and Language Development at 2 Years Old.

Pleau J, Tanguay N, Courtemanche Y et al. · 2025 · Maternal and child health journal

Objectives The objectives of this study are to describe cannabis use during pregnancy, identify associated factors, examine the associations between prenatal cannabis use and the cognitive, motor and language development of 2-year-old…

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Negative / Null Result Report

Short Naps Improve Subsequent Learning in a High School Setting

Vidal V, Pretel MR, Capurro L et al. · 2024 · Preprint

Abstract The application of neuroscience findings in educational settings offers promising opportunities to enhance academic performance. Adolescents, particularly affected by delayed sleep patterns due to early school start times, often…

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Negative / Null Result Report

Range-wide assessment of the Tasmanian devil gut microbiome

Molloy M, McLennan E, Fox S et al. · 2024 · Preprint

The gut microbiome is an important component of host health and function and is influenced by internal and external factors such as host phylogeny, age, diet, and environment. Monitoring the gut microbiome has become an increasingly…

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Negative / Null Result ReportOpen accessMedicine

Determinants of changes in self-esteem after remission of first-episode psychosis: A study of associated cross-sectional and longitudinal factors.

Hidding M, van der Stouwe E, Rosema BS et al. · 2025 · Psychological medicine

Background Low self-esteem is an important and potentially modifiable risk factor for the development and outcome of psychotic disorders. The factors involved in low self-esteem in psychotic disorders are not yet fully understood. The…

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Negative / Null Result ReportMedicine

Chronic Restraint Stress Did Not Alter Active Avoidance Coping or Neuronal Activation Levels of the Medial Prefrontal Cortex or the Nucleus Accumbens in Male Rats.

Kuan HY, Chang CH · 2024 · Journal of physiological investigation

Abstract Stress is an adaptive response crucial for survival. However, chronic stress can lead to maladaptive behaviors and health issues. Prolonged stress reduces the flexibility of defensive coping behaviors. Previous studies have shown…

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Negative / Null Result Report

Age Differences in Reward Discounting in an Effortful 3D Game

van Berlo E, Hausfeld J, Engelmann JB et al. · 2024 · Preprint

In this study, we investigated how spatial, temporal, and effort dimensions collectively influence reward discounting across different age groups. Using a 3D simulated environment, participants aged 7 to 77 chose between a nearby tree with…

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Negative / Null Result ReportOpen accessMedicine

The Effects of Drop Jumps on the Load-Velocity Profile of the Deadlift.

Bakhshinejad JA, Watkins CM, Pelton LM et al. · 2026 · International journal of exercise science

The primary aim of this investigation was to examine the effects of three drop jumps (DJ) on mean velocity (m/s) of subsequent deadlifts at various percentages of 1 RM. A secondary exploratory aim was to evaluate whether protocol order,…

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Negative / Null Result ReportOpen accessMedicine

Characterizing heterogeneity in motivational impairments in psychosis.

Lewandowski KE, Luo J, Yao B et al. · 2025 · Frontiers in psychiatry

Introduction Motivational impairments are a hallmark symptom of psychotic disorders. However, motivation is a multidimensional construct believed to be underpinned by different neural mechanisms and differentially impaired both between and…

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Negative / Null Result ReportMedicine

Aerobic Cycling Exercise Training Does Not Improve Impaired Vagal Reactivation in Patients with Chronic Kidney Disease.

Sabino-Carvalho JL, Li S, Mekonnen E et al. · 2025 · Medicine and science in sports and exercise

Purpose Parasympathetic reactivation is essential for the rapid decrease in heart rate following exercise and delayed heart rate recovery (HRR) post-exercise is linked to poor clinical outcomes. Chronic kidney disease (CKD) is associated…

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Negative / Null Result ReportMedicine

Objective Changes in Pelvic Floor Muscle Strength and Length in Women With High-Tone Pelvic Floor Dysfunction After Pelvic Floor Physical Therapy (RELAX Trial).

Volpe LJ, Zugelder M, Kotarinos R et al. · 2023 · Urogynecology (Philadelphia, Pa.)

Importance Although pelvic floor physical therapy (PFPT) is effective in treating high-tone pelvic floor dysfunction (HTPFD), data on the mechanism of improvement are limited. Objectives This study aimed to compare squeeze intravaginal…

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