Brain mapping in dysphonemic dyslexia: In resting and phonemic discrimination conditions
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Atypical EEG beta asymmetry in adults with ADHD
2010, NeuropsychologiaCitation Excerpt :ADHD–Dyslexia comorbidity has been estimated to range between 25% and 40% (Semrud-Clikeman, Biederman, & Sprich-Buchminster, 1992), and like ADHD, Dyslexia has been associated with RH biased processing during early stages of information processing (for review see: Pugh et al., 2000; Shaywitz & Shaywitz, 2008) and abnormal interhemispheric interaction (Dhar, Been, Minderaa, & Althaus, 2010; Monaghan & Shillcock, 2008; Robichon et al., 2000). This pattern of ABL in Dyslexia also appears to be associated with abnormal brain-state orientation as it seems to be conditionally expressed (Ortiz, Exposito, Miguel, Martin-Loeches, & Rubia, 1992; Pugh et al., 2000; and for review: Shaywitz & Shaywitz, 2008) and can be partly remediated through intensive training of LH encoding strategies (Penolazzi, Spironelli, Vio, & Angrilli, 2010). However, multiple factors indicate that there may be different pathophysiologic mechanisms underlying this shared pattern of ABL in ADHD and Dyslexic populations.
Chapter 41 Sources of EEG activity during a verbal working memory task in adults and children
2002, Supplements to Clinical NeurophysiologyAlpha and beta band power changes in normal and dyslexic children
2001, Clinical NeurophysiologyCitation Excerpt :For dyslexics we expect the ’worst case‘ particularly in these conditions. With respect to the two beta bands predictions are difficult to make because of inconsistent findings reported in the literature (Ackerman et al., 1998; Flynn et al., 1992; Galin et al., 1988; Harmony et al., 1995; Marosi et al., 1995; Ortiz et al., 1992; Rippon and Brunswick, 1998, 2000; Rumsey et al., 1989). In contrast to theta – which shows an event-related increase in band power – during alpha desynchronization there is no contribution to evoked activity which can be observed in event-related potentials (ERP's).
Theta band power changes in normal and dyslexic children
2001, Clinical NeurophysiologyCitation Excerpt :Thus, predictions for the present experiment can hardly be made on the basis of other EEG studies measuring more global power changes. In all of these studies the EEG (spectral or band) power was analyzed not trial per trial but instead either during a resting period (e.g., Harmony et al., 1995) or during the entire task period (e.g. Ackerman et al., 1998; Flynn et al., 1992; Galin et al., 1988; Ortiz et al., 1992; Rippon and Brunswick, 1998, 2000; Rumsey et al., 1989). If task related differences in power were calculated, this was done in terms of differences between a resting and task or between task conditions.
Trait and state EEG indices of information processing in developmental dyslexia
2000, International Journal of PsychophysiologyCitation Excerpt :The beta differences reported by Flynn et al. (1992) occurred at right parietal and occipital leads in dysphonetic dyslexic compared to controls. Ortiz et al. (1992) found higher levels of left hemisphere alpha in the central, temporal and parietal regions and lower levels of left hemisphere beta 2 in the parieto-occipital regions in dysphonemic dyslexic children during a phonemic discrimination task. However, there has been little or no attempt to link the new insights into the association between different frequency bands and specific cognitive processes to the observed EEG differences in children with developmental dyslexia.
Temporal lobe asymmetry and dyslexia: An in vivo study using MRI
1998, Brain and Language