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Interindividual differences in matrix reasoning are linked to functional connectivity between brain regions nominated by Parieto-Frontal Integration Theory

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  • Fraenz, Christoph
  • Schlüter, Caroline
  • Friedrich, Patrick
  • Jung, Rex E.
  • Güntürkün, Onur
  • Genç, Erhan

Abstract

The Parieto-Frontal Integration Theory (P-FIT) predicts that human intelligence is closely linked to structural and functional properties of several brain regions mainly located in the parietal and frontal cortices. It also proposes that solving abstract reasoning tasks involves multiple processing stages and thus requires the harmonic interplay of these brain regions. However, empirical studies directly investigating the relationship between intellectual performance and the strength of individual functional connections related to the P-FIT network are scarce. Here we demonstrate, in two independent samples comprising a total of 1489 healthy individuals, that fMRI resting-state connectivity, especially between P-FIT regions, is associated with interindividual differences in matrix reasoning performance. Interestingly, respective associations were only present in the overall samples and the female subsamples but not in the male subsamples, indicating a sex-specific effect. We found five statistically significant connections which replicated across both samples. These were constituted by BAs 8, 10, 22, 39, 46, and 47 in the left as well as BAs 44 and 45 in the right hemisphere. Given that many of these brain regions are predominantly involved in language processing, we hypothesized that our results reflect the importance of inner speech for solving matrix reasoning tasks. Complementary to previous research investigating the association between intelligence and functional brain connectivity by means of comprehensive network metrics, our study is the first to identify specific connections from the P-FIT network whose functional connectivity strength at rest can be considered an indicator of intellectual capability.

Suggested Citation

  • Fraenz, Christoph & Schlüter, Caroline & Friedrich, Patrick & Jung, Rex E. & Güntürkün, Onur & Genç, Erhan, 2021. "Interindividual differences in matrix reasoning are linked to functional connectivity between brain regions nominated by Parieto-Frontal Integration Theory," Intelligence, Elsevier, vol. 87(C).
    • Handle: RePEc:eee:intell:v:87:y:2021:i:c:s0160289621000295
    DOI: 10.1016/j.intell.2021.101545
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    References listed on IDEAS

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    1. Erhan Genç & Christoph Fraenz & Caroline Schlüter & Patrick Friedrich & Rüdiger Hossiep & Manuel C. Voelkle & Josef M. Ling & Onur Güntürkün & Rex E. Jung, 2018. "Diffusion markers of dendritic density and arborization in gray matter predict differences in intelligence," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    2. Santarnecchi, Emiliano & Emmendorfer, Alexandra & Pascual-Leone, Alvaro, 2017. "Dissecting the parieto-frontal correlates of fluid intelligence: A comprehensive ALE meta-analysis study," Intelligence, Elsevier, vol. 63(C), pages 9-28.
    3. Matthew F. Glasser & Timothy S. Coalson & Emma C. Robinson & Carl D. Hacker & John Harwell & Essa Yacoub & Kamil Ugurbil & Jesper Andersson & Christian F. Beckmann & Mark Jenkinson & Stephen M. Smith , 2016. "A multi-modal parcellation of human cerebral cortex," Nature, Nature, vol. 536(7615), pages 171-178, August.
    4. Santarnecchi, Emiliano & Emmendorfer, Alexandra & Tadayon, Sayedhedayatollah & Rossi, Simone & Rossi, Alessandro & Pascual-Leone, Alvaro, 2017. "Network connectivity correlates of variability in fluid intelligence performance," Intelligence, Elsevier, vol. 65(C), pages 35-47.
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    1. Hilger, Kirsten & Spinath, Frank M. & Troche, Stefan & Schubert, Anna-Lena, 2022. "The biological basis of intelligence: Benchmark findings," Intelligence, Elsevier, vol. 93(C).

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