On random generation and the central executive of working memory

Area of Science:

• Cognitive Psychology
• Human-Computer Interaction
• Behavioral Science

Background:

• Generating truly random sequences is a fundamental task in various fields, yet human performance often deviates from randomness.
• Previous research indicates that factors like response modality and available choices influence the perceived randomness of generated sequences.

Purpose of the Study:

• To investigate the cognitive processes underlying human generation of random sequences.
• To identify key factors affecting oral random number generation compared to key-pressing tasks.
• To explore the role of executive functions in producing random sequences.

Main Methods:

• Four experiments were conducted involving participants generating random sequences orally and via key-pressing.
• Response speed, response set size, and output modality were systematically varied.
• Analysis focused on response patterns, particularly the suppression of repetitions.

Main Results:

• Oral random number generation is significantly impacted by response speed and set size, unlike key-pressing tasks.
• Differences in set size effects were observed across output modalities (oral vs. key-pressing).
• A strong tendency to suppress response repetitions was found, decaying over time, with oral generation difficulty linked to representing choices.

Conclusions:

• Human random sequence generation is constrained by cognitive factors, including executive functions and working memory.
• Current models of attentional control need refinement to incorporate the distinct constraints observed in oral random number generation.
• Understanding these constraints is crucial for improving human performance in tasks requiring random output.