As regards alpha power analysis in our study, there was no significant difference between both groups in the alpha power values during the baseline resting eyes-closed state denoting that the resting alpha power values could not be used in evaluation of cognitive dysfunction in children with BCECTS.
By presenting the target tones, the alpha power values were significantly reduced over different brain regions in the healthy control group, unlike the epileptic children who showed less reduction in the alpha power values.
Different participants of the two study groups reacted differently to the presentation of target tones, some showed alpha power reduction (ERD) while others showed alpha power enhancement (ERS) in the different brain regions, however those showing ERD were more than those showing ERS and this difference …show more content…
In this study, we selected to study power of alpha frequency due to the accumulated data from previous studies that alpha power changes reflect cognitive processes related to attention and semantic memory (Krause et al., 2008).
Moreover, Higashima et al. (2007) reported that event-related alpha attenuation may not be a unitary cognitive phenomenon, desynchronization of the lower alpha activity is topographically widespread on the entire scalp and is thought to reflect attentional processes, while desynchronization of the upper alpha activity is topographically restricted and is thought to reflect higher cognitive processes specific to types of task.
The findings of this study were in agreement with previous studies that confirmed occurrence of significant alpha ERD related to the detection of expected targets during auditory oddball attention tasks as a physiological correlate of widespread brain activation (Sutoh et al., 2000; Mazaheri and Picton,
By presenting the target tones, the alpha power values were significantly reduced over different brain regions in the healthy control group, unlike the epileptic children who showed less reduction in the alpha power values.
Different participants of the two study groups reacted differently to the presentation of target tones, some showed alpha power reduction (ERD) while others showed alpha power enhancement (ERS) in the different brain regions, however those showing ERD were more than those showing ERS and this difference …show more content…
In this study, we selected to study power of alpha frequency due to the accumulated data from previous studies that alpha power changes reflect cognitive processes related to attention and semantic memory (Krause et al., 2008).
Moreover, Higashima et al. (2007) reported that event-related alpha attenuation may not be a unitary cognitive phenomenon, desynchronization of the lower alpha activity is topographically widespread on the entire scalp and is thought to reflect attentional processes, while desynchronization of the upper alpha activity is topographically restricted and is thought to reflect higher cognitive processes specific to types of task.
The findings of this study were in agreement with previous studies that confirmed occurrence of significant alpha ERD related to the detection of expected targets during auditory oddball attention tasks as a physiological correlate of widespread brain activation (Sutoh et al., 2000; Mazaheri and Picton,