Simultaneous EEG and EDA measures in adolescent attention deficit hyperactivity disorder

Is Excessive Electroencephalography Beta Activity Associated with Delinquent Behavior in Men with Attention-Deficit Hyperactivity Disorder Symptomatology?

“…This is in line with the findings of Loo et al [24], who found less alpha power in ADHD compared to controls. In contrast, there are other studies showing elevated alpha power in ADHD [13,15] or no significant differences between ADHD and controls [14,16,22]. These inconsistent results could at least partially be due to the subjects' different levels of arousal and drowsiness during the EEG assessment, as alpha activity is negatively correlated with the arousal level [17].…”

“…Similarly, somewhat contradictory results were reported in the beta band. Whereas Bresnahan and Barry [13] reported an increase in EO (at Pz and Fz electrodes) compared to controls, Lazzaro et al [15], Hobbs et al [22] and Snyder and Hall [16] reported a decrease, and no significant differences were found by Koehler et al [23] and Loo et al [24]. These discrepancies may in part be explained by age effects or differences in the selected EEG features.…”

“…In nondelinquent subjects with ADHD, research has revealed the following findings. In most studies, adolescents and adults with ADHD showed excessive slow-wave activity in eyes open (EO) conditions across the entire scalp compared to controls [13,14,15,16], which has been discussed as the index of a developmental lag [17,18] or cortical underarousal [19,20,21]. In eyes closed (EC) conditions, elevated slow-wave activity was found by Hobbs et al [22] across the scalp and by Koehler et al [23] in posterior regions.…”

“…Concerning alpha activity, the results were more heterogeneous. Some authors found more power across the scalp (with EO [13,15] and EC [23]), whereas others found no significant differences between ADHD subjects and controls [14,16,22], or even less alpha power in frontal and parietal regions in the ADHD group in an EC condition and during a continuous-performance task [24]. Similarly, somewhat contradictory results were reported in the beta band.…”

Quantitative EEG in children with learning disabilities: analysis of band power

“…With respect to dyslexia, the initial expectation that qEEG variables could discriminate healthy individuals from those with dyslexi a 8 , failed to be confirmed by other authors 9 . Childre n with attention deficit/hyperactivity disorder (ADHD) show a greater contingent of slow activity and less beta [10][11][12][13] , although the clinical use of qEEG in ADHD has still to be confirm e d 1 4 . Recently there has been renewed interest in studying the relationship between qEEG variables and IQ measurements.…”