Neuronal Impairment and Instability
نویسندگان
چکیده
The scalp potentials originate in neuronal activity in the brain cortex, and neuronal abnormality causes scalp potential abnormality. As a measure of scalp potential abnormality, the normalized power variance, NPV, of EEG signals is introduced, where its mean m and standard deviation are defined for each of 21 EEG channel over a group of normal controls. When an NPV value of a subject to be tested is larger or smaller than m , neurons contributing to generation of the scalp potentials are regarded as abnormal, namely hyperactive or hypoactive. Similarities are observed between the abnormality map and the corresponding regional cerebral blood flow reduction map measured by SPECT.
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