Logo
Logo

Goldsmiths - University of London

Neurocomputational Consequences of Evolutionary Connectivity Changes in Perisylvian Language Cortex

Schomers, M.R.; Garagnani, M. and Pulvermüller, F.. 2017. Neurocomputational Consequences of Evolutionary Connectivity Changes in Perisylvian Language Cortex. The Journal of Neuroscience, 37(11), pp. 3045-3055. ISSN 0270-6474 [Article]

[img]
Preview
Text
Schomers-EtAlJoN2017.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (1MB) | Preview

Abstract or Description

The human brain sets itself apart from that of its primate relatives by specific neuroanatomical features, especially the strong linkage of left perisylvian language areas (frontal and temporal cortex) by way of the arcuate fasciculus (AF). AF connectivity has been shown to correlate with verbal working memory—a specifically human trait providing the foundation for language abilities— but a mechanistic explanation of any related causal link between anatomical structure and cognitive function is still missing. Here, we provide a possible explanation and link, by using neurocomputational simulations in neuroanatomically structured models of the perisylvian language cortex. We compare networks mimicking key features of cortical connectivity in monkeys and humans, specifically the presence of relatively stronger higher-order “jumping links” between nonadjacent perisylvian cortical areas in the latter, and demonstrate that the emergence of working memory for syllables and word forms is a functional consequence of this structural evolutionary change. We also show that a mere increase of learning time is not sufficient, but that this specific structural feature, which entails higher connectivity degree of relevant areas and shorter sensorimotor path length, is crucial. These results offer a better understanding of specifically human anatomical features underlying the language faculty and their evolutionary selection advantage.

Item Type: Article

Identification Number (DOI):

https://doi.org/10.1523/JNEUROSCI.2693-16.2017

Departments, Centres and Research Units:

Computing

Dates:

DateEvent
11 January 2017Accepted
13 February 2017Published Online
15 March 2017Published

Item ID:

20208

Date Deposited:

19 Apr 2017 08:48

Last Modified:

20 Jun 2017 10:22

URI: http://research.gold.ac.uk/id/eprint/20208

View statistics for this item...

Edit Record Edit Record (login required)