Authors (including presenting author) :
Chan MKL (1)(2), Yeung WKY(1), Yu JKP(1), Ng SSW(1), Tong RKY(2)
Affiliation :
(1)Community Rehabilitation Service Support Centre, Queen Elizabeth Hospital, Kowloon, Hong Kong.
(2)Department of Biomedical Engineering, The Chinese University of Hong Kong, New Territories, Hong Kong.
Introduction :
Cognitive dysfunction and mood disorder are common after stroke. Traditionally, the therapist would adopt clinical assessments to measure different areas of cognition and psychological condition. However, the result is limited by health care worker manpower and resources. EEG assessment is more commonly adopted in clinic environment nowadays. This study compares the EEG difference of people with chronic stroke in eye closed and eye open condition and investigate their correlation with the clinical outcome.
Objectives :
To measure the EEG signals of the people with chronic stroke in eyes closed and eyes open condition, and study their relationship with the cognitive and psychological performance.
Methodology :
The investigators would conduct cognitive and psychological tests on recruited subjects. Their EEG signal was captured by 16 channels EEG system. The absolute power under different frequency band and EEG index (delta alpha ratio and pairwise derived brain symmetry index) in different eye condition was compared. Pearson’s correlation was conducted to investigate the association between the clinical tests and EEG index.
Result & Outcome :
32 subjects were recruited for the study. Both the right brain lesion (p=>.001) and left brain lesion (p=.009) groups showed significant power changes in alpha frequency range (8-12 Hz) during eye closed and eye open condition. In addition, there was significant correlation between the pairwise derived brain symmetry index (pdBSI) with the Stroop Test (p=.0016), Paced Auditory Serial Addition Test-3 seconds (p=.0077)/2 seconds (p=.002) and WHO-5 well-being scale (p=.023).It is recommended to use EEG as adjunct neuropsychological assessment in clinic for the people with chronic stroke especially for those clients who could not attend conventional assessments.
