Forward and Backward Recalling Sequences in Spatial and Verbal Memory Tasks: What Do We Measure?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Information Theory

Background:

• Existing literature presents varied perspectives on cognitive domains like memory and executive function, with limited understanding of underlying cognitive processes.
• Previous work established a methodology for testing cognitive constructs in visuo-spatial and verbal recall, highlighting entropy's role in working memory task difficulty.

Purpose of the Study:

• To apply previously developed insights on entropy and cognitive constructs to new memory tasks, specifically backward digit sequences and block tapping.
• To further investigate the role of entropy in defining the difficulty and underlying constructs of memory tasks.

Main Methods:

• Utilized construct specification equations (CSEs) to model task difficulty based on entropy.
• Applied the methodology to backward recalling block tapping and digit sequences.
• Analyzed dimensionality and measurement uncertainties in the CSEs for backward sequences.

Main Results:

• Clear and strong entropy-based CSEs were observed for task difficulty in the new memory tasks.
• Entropy contributions in the CSEs were of similar magnitudes across tasks, suggesting a potential shared cognitive factor.
• Dimensionality analyses and larger uncertainties in backward sequence CSEs indicated greater complexity.

Conclusions:

• Entropy is a significant factor in memory task difficulty, potentially reflecting shared cognitive processes across various recall tasks.
• While a shared factor may exist, the increased complexity in backward recall tasks necessitates caution when proposing a single, unidimensional construct for all memory tasks.