Desynchronization/synchronization of lateral EEG rhythms during habituation to photostimulation in adults

作者：Brust Carmona Hector^*; Valadez Gabriel; Galicia Marlene; Flores Avalos Blanca; Sanchez Ana; Espinosa Rosa; Yanez Oscar

来源：Revista de Investigacion Clinica, 2013, 65(5): 436-444.

• qEEG habituation
• Desynchronization/synchronization of alpha
• Synchronization of beta
• Linear regression habituation

Background. Berger related the EEG with cognition; we are attempting to identify which rhythms and circuits participate in habituation, a learning that decreases responses to meaningless stimuli which, changed the absolute power (AP) of EEG oscillations. Objective. To characterize habituation, analyzing the AP of four rhythms in lateral regions of both hemispheres (BH), proposing that their diminution, desynchronization (D), means activation whereas their increase, synchronization (S), means inhibition. Material and methods. qEEG analysis in 83 college students, in waking state with closed eyes, and photostimulated (RPh). The used UAMI/Yanez software identifies RPh signals and takes 2-s samples before (Pre) and during RPh; the Welch periodogram integrates the AP of the four rhythms. We calculated the average AP (AAP) in Pre and RPh per frequency in bipolar lateral leads per hemisphere. AAP differences mere evaluated with the Wilcoxon tests correcting with Bonferroni for repeated samples. Applying the linear regression model, we plotted the AAP distribution slopes during Pre and RPh. Results. We established the differences of the AP of the four rhythms within each hemisphere and between both hemispheres (BH). During PRE, AAP of delta and theta increased whereas alpha and beta decreased. RPh increased the AAP (p = 0.01) of the four rhythms in fronto-frontal (FF) leads; the increase in delta persisted in fronto-temporal (FT) and temporo-occipital (TO), whereas beta's increase persisted in all leads. The AAP of a decreased with the first RPh (D) increasing with the following ones; its slope starts with desynchronization and ends with synchronization. Theta followed a D/S pattern in temporal leads. Beta followed and ascending (S) slope in all leads. Conclusions. Habituation results from the D/S of a in all cortical regions, of theta in temporal, of delta in frontal regions and beta in all regions. Synchronization reflects hyperpolarization of neuronal membranes, decreasing their activity.

• 出版日期2013-10