EEG Measurement Site Suitable for SSVEP-BCI Assuming Aphasia

Brain-computer interface (BCI) connects the brain and computer. Support for people with disabilities is a frequent topic in studies on steady-state visual evoked potential (SSVEP)-BCI. This study aimed to adapt SSVEP-BCI for individuals with aphasia accompanied by paralysis. The subject of this study suffered from aphasia due to stroke and experienced decreased vision in the right eye due to right hemiplegia. We conducted a comparison of SSVEP-BCI accuracy using an electroencephalogram (EEG) obtained from the primary visual cortex (whole area), the left primary visual cortex (left area), and the right primary visual cortex (right area). We investigated the measurement site of SSVEP-BCI for BCI accuracy by measuring areas such as whole area, left area, and right area, for which the accuracy rates were 81.03%, 43.96%, and 86.97%, respectively. Therefore, based on these results, EEG from the right area should be used for the subjects in this study. These results underscore the importance of selecting measurement sites that consider the brain function of aphasia patients.