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  Indian J Med Microbiol
 

Figure 2: Extraction of alpha peak characters including power and frequency and their variability. (a) A power spectral density of an artifact-free segment electroencephalography activity shows alpha peak (blue surface). (b and c) A fluctuating sequence of power and its histogram; this sequence characterized by its average, indicating alpha power, and its standard deviation, δ(p), indicating variability of alpha power. (d and e) A fluctuating sequence of frequency and its histogram; this sequence characterized by its average, indicating alpha frequency, and its standard deviation, δ(f), indicating variability of alpha frequency

Figure 2: Extraction of alpha peak characters including power and frequency and their variability. (a) A power spectral density of an artifact-free segment electroencephalography activity shows alpha peak (blue surface). (b and c) A fluctuating sequence of power and its histogram; this sequence characterized by its average, indicating alpha power, and its standard deviation, δ(p), indicating variability of alpha power. (d and e) A fluctuating sequence of frequency and its histogram; this sequence characterized by its average, indicating alpha frequency, and its standard deviation, δ(f), indicating variability of alpha frequency