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A study by D’Zmura et al. (2009) in which two syllables were spoken in imagination showed that imagined speech information was present in EEG alpha, beta and theta bands. The beta band (13-18 Hz) proved most informative. The most informative electrodes were located mainly near the top of the head (vertex) where electromyographic artifacts had least ...


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An old question, but there has been some recent developments by third-parties and now cheaper and hopefully just-as-accurate EEGs exist. From Are recent affordable EEG devices any good? we see the Emotiv System and a paper that can attest to its accuracy. We also have OpenBCI, an open-source EEG catered to makers, which has recently been funded ...


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Yes they do. That is to say, light conditions do not generally affect alpha waves, only the eyelids do (and other factors). This has led to alpha waves being interpreted as reflecting an active inhibitory process in the visual cortex (relaxation) rather than a reduction of stimulus (resting). The following image is from an Israeli study published in 2013 ...



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