We examined 75 patients who had suffered an ischemic stroke and exhibited cognitive impairments. Patients were categorized into three groups: those with subjective cognitive impairment (SCI), mild cognitive impairment (MCI), and moderate cognitive impairment (MoCI). Cognitive function was assessed using MMSE, MOCA, FAB, the “10 words” test, the Schulte test, and cognitive evoked potentials (P300). The results showed varying degrees of cognitive dysfunction depending on the severity group, with the most significant changes seen in the MoCI group.