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Making Brains run Faster: are they Becoming Smarter?

Published online by Cambridge University Press:  05 December 2016

Anja Pahor  and
Norbert Jaušovec
Anja Pahor*
Affiliation:
University of Maribor (Slovenia)
Norbert Jaušovec
Affiliation:
University of Maribor (Slovenia)
*
*Correspondence concerning this article should be addressed to Anja Pahor. Univerza v Mariboru. Filozofska fakulteta. Koroška 160. 2000. Maribor (Slovenia). Fax: +38–62258180. E-mail: [email protected]
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Abstract

A brief overview of structural and functional brain characteristics related to g is presented in the light of major neurobiological theories of intelligence: Neural Efficiency, P-FIT and Multiple-Demand system. These theories provide a framework to discuss the main objective of the paper: what is the relationship between individual alpha frequency (IAF) and g? Three studies were conducted in order to investigate this relationship: two correlational studies and a third study in which we experimentally induced changes in IAF by means of transcranial alternating current stimulation (tACS). (1) In a large scale study (n = 417), no significant correlations between IAF and IQ were observed. However, in males IAF positively correlated with mental rotation and shape manipulation and with an attentional focus on detail. (2) The second study showed sex-specific correlations between IAF (obtained during task performance) and scope of attention in males and between IAF and reaction time in females. (3) In the third study, individuals’ IAF was increased with tACS. The induced changes in IAF had a disrupting effect on male performance on Raven’s matrices, whereas a mild positive effect was observed for females. Neuro-electric activity after verum tACS showed increased desynchronization in the upper alpha band and dissociation between fronto-parietal and right temporal brain areas during performance on Raven’s matrices. The results are discussed in the light of gender differences in brain structure and activity.

Keywords

individual alpha frequencyscope of attentionsex differencestranscranial alternating current stimulationupper alphaworking memory
Type
Research Article
Information
The Spanish Journal of Psychology , Volume 19 , 2016 , E88
Copyright
Copyright © Universidad Complutense de Madrid and Colegio Oficial de Psicólogos de Madrid 2016 

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