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The individual alpha frequency (IAF), as an anchor frequency, was selected according to literature .
As EEG power in the theta and alpha frequency range has been described that is related to cognition and memory [47, 54].
Studies focusing on age-related changes in elderly subjects have consistently found a general slowing of the EEG with a decrease in power particularly in the upper alpha frequency range (e.g., Christian, 1984; Markand, 1990; Obrist, 1954), but a pronounced power increase in the slow frequency ranges of about 7 Hz and below.
We expect that the predicted differences in the theta and alpha frequency range hold true for memory, but not for calculation performance.
Analysis of the alpha frequency
band for the movement imagery task compared to baseline
Five outcomes were assessed in this study: peak alpha frequency
(PAF) and four domains of autism problems as assessed by the ATEC.
In addition to former studies we differentiated in the current analysis between lower and higher alpha power and found evidence that this power reduction is more pronounced in the lower alpha frequency
range (8-10 Hz) than in the upper alpha frequency
range (10-12 Hz).
However in tinnitus patients, the auditory cortex shows increased gamma band activity  associated with reduced activity in the alpha frequency