The ability to perform skilled limb movements requires a dynamic interaction between the hemispheres. Following a stroke, an imbalance in the interhemispheric cortical interaction may be established. Stroke is one of the leading causes of adult disability worldwide. The intrahemispheric PRI index may provide insights into therapeutic approaches for interhemispheric asymmetry after stroke. Despite being unable to detect interhemispheric differences, the DAR index seems to be more sensitive to detect motor impairment-related frequency oscillations. Only the intrahemispheric PRI index was able to find significant interhemispheric differences of frequency oscillations. Considering the cerebral index (DAR and PRI), our results showed a slowing in brain activity in poststroke patients when compared to healthy controls. The qEEG indexes (PRI and DAR) were computed for each hemisphere (intrahemispheric index) and for both hemispheres (cerebral index). Severity of upper limb motor impairment was classified according to the Fugl–Meyer assessment in mild/moderate ( ) and severe ( ). Forty-seven poststroke subjects and twelve healthy controls were included in the study. Here, we proposed a new perspective for analyzing DAR and PRI within each hemisphere and investigated the motor impairment-related interhemispheric frequency oscillations.

However, few studies have used quantitative electroencephalography (qEEG) index of ratios between slower and faster frequencies such as the delta/alpha ratio (DAR) and the power ratio index (PRI ) for investigating the difference between the affected and unaffected hemisphere poststroke. The ratio between slower and faster frequencies of brain activity may change after stroke.

107 motor issues