The P-FIT is influential in that it explains the majority of current neuroimaging findings, as well as increasing empirical support for cognition being the result of large-scale brain networks, rather than numerous domain-specific processes or modules.
The review included only neuroimaging techniques with high spatial resolution to examine the structural and functional correlates of intelligence.
Further, based on the imaging genomic studies reviewed, the authors suggest a mediating role of ASPM and microcephalin genes in the relationship between volumes of gray and white matter of the areas implicated in the P-FIT theory.
The identified inconsistencies include voxel clusters in the frontal eye fields, the inferior and middle temporal gyrus, areas which are involved in planning complex movements, high-level visual processing, respectively.
[6] Vakhtin et al. (2014) determined to identify functional networks relating to fluid intelligence, as measured by both the standard and advanced versions of Raven's Progressive Matrices test.
Using fMRI, Vakhtin et al. found a discrete set of networks associated with fluid reasoning, including the dorsolateral cortex, inferior and parietal lobule, anterior cingulate, as well as temporal and occipital regions.
The authors scanned 79 American university students three times each, wherein one session was at 'resting state', and in the other two the participants were asked to complete problems taken from Raven's Standard and Advanced Progressive Matrices.
[10] Barbey, Colom, Solomon, Krueger, and Forbes (2012) use voxel-based lesion symptom mapping to identify regions that interfere with performance on the WAIS and the Delis-Kaplan executive function system.
The frontal and parietal lobes were found to be critical for executive control processes, which was demonstrated by significantly worse performance on specific executive functioning subtests in participants with damage to frontal and parietal regions, as well as the white matter tracts connecting these regions, such as the superior fronto-occipital fasciculus.
[2] The P-FIT is highly compatible with the neural efficiency hypothesis, and is supported by evidence of the relationship between white matter integrity and intelligence.
For example, a study indicates that white matter integrity provides the neural basis for the rapid processing of information, which is considered central to general intelligence.