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Updated: Jun 2, 2026

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

Published on: April 7, 2020

Time-of-Day Effects on Competitive Speedcubing Performance.

Sanjay Adireddi Adireddi¹

¹Ladue Horton Watkins High School, United States.

Journal of Circadian Rhythms

|June 1, 2026

Summary

This summary is machine-generated.

Competitive speedcubers show a midday dip in 4x4x4 Rubik's Cube performance, despite raw data suggesting morning and evening peaks. This cognitive-motor performance finding highlights the importance of adjusting for competition schedules.

Keywords:

circadian rhythm cognitive-motor performance post-prandial alertness dip speedcubing time of day

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Area of Science:

Cognitive Neuroscience
Human Performance
Chronobiology

Background:

Competitive speedcubing integrates complex cognitive and motor skills.
Understanding time-of-day effects on expert performance is crucial.
Standardized World Cube Association (WCA) rules provide a unique research paradigm.

Purpose of the Study:

To investigate time-of-day effects on expert cognitive-motor performance in speedcubing.
To analyze record-setting performances across various Rubik's Cube sizes.
To assess the impact of competition scheduling on observed performance patterns.

Main Methods:

Analysis of 6,600 record-setting performances (2003-2025) across 3x3x3 to 6x6x6 cubes.
Application of an exposure-adjusted framework to correct for non-uniform competition scheduling.
Statistical evaluation using a within-competition permutation null model.

Main Results:

Raw record counts showed bimodal distributions, but exposure adjustment revealed scheduling artifacts.
A statistically significant suppression of 4x4x4 record probability was observed between 12:30-15:00.
This midday dip in 4x4x4 performance was consistent across regions and competitive eras, unlike other cube sizes.

Conclusions:

Exposure adjustment is methodologically vital for ecological performance analyses.
A specific midday performance deficit exists for the 4x4x4 Rubik's Cube event.
Further research is warranted to explore the underlying causes of this 4x4x4 performance suppression.