OBJECTIVE: The phenomenon of 'déjà vu' is caused by acute disturbance of mnemonic systems of the medial temporal lobe (MTL). In epileptic patients investigated with intracerebral electrodes, déjà vu can be more readily induced by stimulation of the rhinal cortices (RCs) than the hippocampus (H). Whether déjà vu results from acute dysfunction of the familiarity system alone (sustained by RC) or from more extensive involvement of the MTL region (including H) is debatable. METHODS: We analysed the synchronisation of intracerebral electroencephalography (EEG) signals recorded from RC, H and amygdala (A) in epileptic patients in whom déjà vu was induced by electrical stimulation. EEG signal correlations (between signals from RC, A and H) were evaluated using a nonlinear regression. RESULTS: In comparison with RC stimulations that did not lead to déjà vu (DV-), stimulations triggering déjà vu (DV+) were associated with increased broadband EEG correlation (p=0.01). Changes in correlations were significantly different in the theta band for RC-A (p=0.007) and RC-H (p=0.01) and in the beta band for RC-H (p=0.001) interactions. CONCLUSION: Déjà vu is associated with increased EEG signal correlation between MTL structures. SIGNIFICANCE: Results are in favour of a mechanism involving transient co-operation between various MTL structures, not limited to RC alone.
OBJECTIVE: The phenomenon of 'déjà vu' is caused by acute disturbance of mnemonic systems of the medial temporal lobe (MTL). In epilepticpatients investigated with intracerebral electrodes, déjà vu can be more readily induced by stimulation of the rhinal cortices (RCs) than the hippocampus (H). Whether déjà vu results from acute dysfunction of the familiarity system alone (sustained by RC) or from more extensive involvement of the MTL region (including H) is debatable. METHODS: We analysed the synchronisation of intracerebral electroencephalography (EEG) signals recorded from RC, H and amygdala (A) in epilepticpatients in whom déjà vu was induced by electrical stimulation. EEG signal correlations (between signals from RC, A and H) were evaluated using a nonlinear regression. RESULTS: In comparison with RC stimulations that did not lead to déjà vu (DV-), stimulations triggering déjà vu (DV+) were associated with increased broadband EEG correlation (p=0.01). Changes in correlations were significantly different in the theta band for RC-A (p=0.007) and RC-H (p=0.01) and in the beta band for RC-H (p=0.001) interactions. CONCLUSION: Déjà vu is associated with increased EEG signal correlation between MTL structures. SIGNIFICANCE: Results are in favour of a mechanism involving transient co-operation between various MTL structures, not limited to RC alone.
Authors: Alexander V Lebedev; Martin Lövdén; Gidon Rosenthal; Amanda Feilding; David J Nutt; Robin L Carhart-Harris Journal: Hum Brain Mapp Date: 2015-05-22 Impact factor: 5.038
Authors: Anne M Cleary; Joseph Neisser; Timothy McMahan; Thomas D Parsons; Abdulrhaman Alwaki; Noah Okada; Armin Vosoughi; Ammar Kheder; Daniel L Drane; Nigel P Pedersen Journal: Epilepsy Behav Date: 2021-11-01 Impact factor: 2.937
Authors: Robin L Carhart-Harris; Robert Leech; Peter J Hellyer; Murray Shanahan; Amanda Feilding; Enzo Tagliazucchi; Dante R Chialvo; David Nutt Journal: Front Hum Neurosci Date: 2014-02-03 Impact factor: 3.169