Application of directed transfer function and network formalism for assessment of functional connectivity in working memory task
PBN-AR
Instytucja
Wydział Psychologii (SWPS Uniwersytet Humanistycznospołeczny z siedzibą w Warszawie)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences
ISSN
1364-503X
EISSN
Wydawca
The Royal Society Publishing
DOI
Rok publikacji
2013
Numer zeszytu
1997
Strony od-do
1-16
Numer tomu
371
Identyfikator DOI
Liczba arkuszy
0.75
Słowa kluczowe
en
functional connectivity
short-time directed transfer function
working memory task
weighted directed networks
community structure of networks
Streszczenia
Język
en
Treść
The dynamic pattern of functional connectivity during a working memory task was investigated by means of the short-time directed transfer function. A clear-cut picture of transmissions was observed with the main centres of propagation located in the frontal and parietal regions, in agreement with imaging studies and neurophysiological hypotheses concerning the mechanisms of working memory. The study of the time evolution revealed that most of the time short-range interactions prevailed, whereas the communication between the main centres of activity occurred more sparsely and changed dynamically in time. The patterns of connectivity were quantified by means of a network formalism based on assortative mixing—an approach novel in the field of brain networks study. By means of application of the above method, we have demonstrated the existence of a modular structure of brain networks. The strength of interaction inside the modules was higher than between modules. The obtained results are compatible with theories concerning metabolic energy saving and efficient wiring in the brain, which showed that preferred organization includes modular structure with dense connectivity inside the modules and more sparse connections between the modules.
Inne
System-identifier
IMPORT-ARTICLE-00016899
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