The random number generation task: psychometric properties and normative data of an executive function task in a...

Area of Science:

• Psychology
• Neuroscience
• Psychiatry

Background:

• The random number generation (RNG) task is used to assess executive functions.
• Its psychometric properties and clinical utility require further investigation.

Purpose of the Study:

• To evaluate the psychometric properties of the RNG task.
• To examine its construct validity and test-retest reliability.
• To assess its performance in healthy adults and patients with schizophrenia.

Main Methods:

• Four studies were conducted with young adults, middle-aged adults, and schizophrenia patients.
• Factor analysis was used to determine the task's structure.
• Test-retest reliability and correlations with neurocognitive tasks (e.g., Stroop test) were assessed.

Main Results:

• A three-factor solution (seriation, repetition, cycling) best described the RNG task.
• The seriation factor demonstrated acceptable test-retest stability.
• RNG performance correlated with executive functions and was poorer in schizophrenia patients compared to controls.

Conclusions:

• The RNG task possesses modest to acceptable psychometric properties.
• It effectively measures executive subfunctions, including inhibition, updating, and monitoring.
• These functions are often impaired in psychopathological and neurological conditions.