Abstract: Objective：To explore the relations between the electroencephalogram power spectrum changes and cerebral artery stenosis (CAS)in patients with mild cognitive impairment (MCI). Methods: A total of 71 MCI patients were divided into three groups: non vascular damage group; moderate vascular damage group and severe vascular damage group according to head magnetic resonance angiography (MRA). EEGs were recorded at rest. Relative power was separately computed for ?, ?, ?1, ?2 and ?3 frequency bands. Results: In the spectral band power the severity of CAS was associated with increased ? power and decreased ?2 power. alpha3 power. The ?/?1 ratio increasing was consistent with the severity of CAS. All the differences were statistically significant. Conclusions: Together with ?/?1 ratio,?? and ?2 have great significance in indicating the severity of CAS in MCI patients.

Key words: mild cognitive impairment (MCI), EEG, power spectrum, cerebral artery stenosis