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Evidence of language-related left hypofrontality in Major Depression: An EEG Beta band study.

Abstract：

:Major depression (MDD) has been associated with an altered EEG frontal asymmetry measured in resting state; nevertheless, this association has showed a weak consistency across studies. In the present study, which starts from an evolutionistic view of psychiatric disorders, we investigated frontal asymmetry in MDD, using language as a probe to test the integrity of large inter- and intra-hemispheric networks and processes. Thirty MDD patients (22 women) and 32 matched controls (HC) were recruited for an EEG recording in resting state and during two linguistic tasks, phonological and semantic. Normalized alpha and beta EEG spectral bands were measured across all three conditions in the two groups. EEG alpha amplitude showed no hemispheric asymmetry, regardless of group, both at rest and during linguistic tasks. During resting state, analysis of EEG beta revealed a lack of hemispheric asymmetry in both groups, but during linguistic tasks, HC exhibited the typical greater left frontal beta activation, whereas MDD patients showed a lack of frontal asymmetry and a significantly lower activation of left frontal sites. In depressed patients, positive affect was negatively correlated with depression levels and positively correlated with left frontal EEG beta amplitude. Language represents the human process that requires the largest level of integration between and within the hemispheres; thus, language asymmetry was a valid probe to test the left frontal alteration encompassing highly impairing psychiatric disorders, such as schizophrenia and MDD. Indeed, these severe diseases are marked by delusions, ruminations, thought disorders, and hallucinations, all of which have a clear linguistic or metalinguistic basis.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Spironelli C,Maffei A,Romeo Z,Piazzon G,Padovan G,Magnolfi G,Pasini I,Gomez Homen F,Concari G,Angrilli A

doi

10.1038/s41598-020-65168-w

subject

Has Abstract

pub_date

2020-05-18 00:00:00

pages

8166

issue

1

issn

2045-2322

pii

10.1038/s41598-020-65168-w

journal_volume

10

pub_type

杂志文章

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