Time-of-Day Effects on Competitive Speedcubing Performance

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.