Structural covariance mapping delineates medial and medio-lateral temporal networks in déjà vu

Research output: Contribution to journalArticle

View graph of relations Save citation

Authors

Research units

Abstract

Déjà vu (DV) is an eerie phenomenon experienced frequently as an aura of temporal lobe epilepsy, but also reported commonly by healthy individuals. The former pathological manifestation appears to result from aberrant neural activity among brain structures within the medial temporal lobes. Recent studies also implicate medial temporal brain structures in the non-pathological experience of DV, but as one element of a diffuse neuroanatomical correlate; it remains to be seen if neural activity among the medial temporal lobes also underlies this benign manifestation. The present study set out to investigate this. Due to its unpredictable and infrequent occurrence, however, non-pathological DV does not lend itself easily to functional neuroimaging. Instead, we draw on research showing that brain structure covaries among regions that interact frequently as nodes of functional networks. Specifically, we assessed whether grey-matter covariance among structures implicated in non-pathological DV differs according to the frequency with which the phenomenon is experienced. This revealed two diverging patterns of structural covariation: Among the first, comprised primarily of medial temporal structures and the caudate, grey-matter volume becomes more positively correlated with higher frequency of DV experience. The second pattern encompasses medial and lateral temporal structures, among which greater DV frequency is associated with more negatively correlated grey matter. Using a meta-analytic method of co-activation mapping, we demonstrate a higher probability of functional interactions among brain structures constituting the former pattern, particularly during memory-related processes. Our findings suggest that altered neural signalling within memory-related medial temporal brain structures underlies both pathological and non-pathological DV.

Request a copy

Request a copy

Details

Original languageEnglish
Pages (from-to)1068-1079
Number of pages12
JournalBrain Imaging and Behavior
Volume10
Issue number4
Early online date31 Oct 2015
DOIs
Publication statusE-pub ahead of print - 31 Oct 2015

    Keywords

  • Déjà vu, Grey matter, Memory, Meta-analytic connectivity modelling, Structural co-variance

Employable Graduates; Exploitable Research

Copy the text from this field...