Neural correlates of cognitive efficiency

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Competition between functional brain networks mediates behavioral variability (2008, background): “These suggestions are consistent with the idea that a crucial determinant of interindividual differences in performance is the efficiency of interactions between brain regions (Rypma et al., 2006).”
Resting State fMRI: A Personal History (2012, methodology): “After hearing a talk by Dr Rainer Goebel on Granger Causality Analysis, it occurred to us that this could be the method to give us some leverage on specific directional hypotheses which we had regarding the influence of the prefrontal cortex over other brain regions (e.g., Biswal et al., 2010a, 2010”
Cognitive processing speed and the structure of white matter pathways: Convergent evidence from normal variation and lesion studies (2008, unknown): “A functional brain imaging investigation found that better performance on the Digit-Symbol test is associated with higher BA 40 activity (Rypma et al., 2006).”
Cognitive Neuroscience Approaches to Individual Differences in Working Memory and Executive Control: Conceptual and Methodological Issues (2010, background): “More generally, frontoparietal hyperactivations in older adults and poorlyperforming young adults are often attributed to compensatory processing or differences in neural efficiency (Gray et al., 2005; Haier et al., 1992; Larson et al., 1995; Rypma et al., 2006).”