Journal
JOURNAL OF EXPERIMENTAL PSYCHOLOGY-GENERAL
Volume 140, Issue 4, Pages 674-692Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/a0024695
Keywords
general fluid intelligence; working memory; interference control; prefrontal cortex; functional MRI
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Funding
- NIMH NIH HHS [R01 MH66078, R01 MH066078, R01MH66088, R01 MH066088] Funding Source: Medline
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Fluid intelligence (gF) and working memory (WM) span predict success in demanding cognitive situations. Recent studies show that much of the variance in gF and WM span is shared, suggesting common neural mechanisms. This study provides a direct investigation of the degree to which shared variance in gF and WM span can be explained by neural mechanisms of interference control. The authors measured performance and functional magnetic resonance imaging activity in 102 participants during the n-back WM task, focusing on the selective activation effects associated with high-interference lure trials. Brain activity on these trials was correlated with gF, WM span, and task performance in core brain regions linked to WM and executive control, including bilateral dorsolateral prefrontal cortex (middle frontal gyrus; BA9) and parietal cortex (inferior parietal cortex; BA 40/7). Interference-related performance and interference-related activity accounted for a significant proportion of the shared variance in gF and WM span. Path analyses indicate that interference control activity may affect gF through a common set of processes that also influence WM span. These results suggest that individual differences in interference-control mechanisms are important for understanding the relationship between gF and WM span.
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