Working memory complex span tasks and fluid intelligence: Does the positional structure of the task matter?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Intelligence Research

Background:

• Complex span tasks are key measures of working memory (WM) capacity.
• These tasks are highly predictive of fluid intelligence.
• Existing research has not investigated how variations in complex span task structures influence their predictive validity.

Purpose of the Study:

• To investigate whether different complex span task structures (processing-storage vs. storage-processing) affect working memory span measurements.
• To determine if these structural variations influence the predictive power of complex span tasks for fluid intelligence.

Main Methods:

• Participants completed two types of complex span tasks: processing-storage and storage-processing.
• Working memory spans and serial position curves were analyzed for each task type.
• Performance on a reasoning test (WAIS-IV Matrix Reasoning) was assessed to evaluate predictive validity.

Main Results:

• Significant differences in working memory spans were found between the two task structures, with higher spans in the processing-storage condition.
• Distinct serial position curves were observed for each task type.
• Crucially, both complex span task structures demonstrated equivalent predictive power for reasoning ability.

Conclusions:

• While complex span task structures can influence working memory span scores, they do not differentially affect the prediction of fluid intelligence.
• These findings support the time-based resource-sharing model of working memory.
• The choice of complex span task structure may not be critical for assessing fluid intelligence.