Scope of attention, control of attention, and intelligence in children and adults

Cowan, Nelson; Fristoe, Nathanael M.; Elliott, Emily M.; Brunner, Ryan P.; Saults, J. Scott · 2006 · OpenAlex

DOI: 10.3758/bf03195936

archive: archived pipeline: cataloged verified

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Summary

This study investigates the distinct yet related roles of attention scope (storage capacity) and attention control (processing) in predicting intelligence across developmental stages. While previous research established that both factors correlate with cognitive aptitude, it remained unclear whether they represent independent mechanisms or shared resources, and how their influence differs between children and adults. The authors aimed to disentangle these components by examining individual differences in 52 children (aged 10–11) and 52 college students. The experimental design employed specific tasks to isolate storage and control functions. Attention scope was measured using a visual array comparison task, which limits rehearsal and grouping to assess core working memory capacity. Attention control was assessed via a dual-modality selective listening procedure, where participants monitored either auditory digits or visual letters while ignoring the other stream; the benefit in recall for attended versus ignored items served as the control metric. Intelligence was evaluated using verbal (vocabulary) and nonverbal (pattern analysis) subtests from the Stanford–Binet Intelligence Scale. Results indicated significant developmental differences in attentional strategies. Adults demonstrated robust attentional control, showing significantly better recall for attended items compared to ignored ones. In contrast, children showed little evidence of sophisticated control, performing similarly on attended and ignored lists, suggesting they could not effectively suppress irrelevant information. Regarding intelligence, attention scope predicted performance in both groups. However, in adults, both scope and control accounted for considerable variance in intelligence scores. Approximately one-third of this variance was shared between the two attentional measures, while the remainder was unique to each. In children, only attention scope significantly predicted intelligence, as control mechanisms were not yet fully developed or utilized. The findings conclude that scope and control of attention are related but distinct contributors to intelligence. The study supports a theoretical model where storage (parietal-mediated) and processing (frontal-mediated) functions are separable yet integrated. The developmental trajectory suggests that while storage capacity is a fundamental predictor of intelligence from childhood, the ability to control attention becomes a significant, independent predictor of cognitive aptitude in adulthood. This distinction clarifies that intelligence is not solely a function of memory capacity but also relies on the mature ability to regulate attentional resources.

Key finding

In adults, both the scope and control of attention independently and jointly predicted intelligence, whereas in children, only the scope of attention significantly predicted intelligence due to limited attentional control capabilities.

Methodology

lab_experiment

Sample size: 104

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• cognitive capacity variation