What do the values from the sensors mean?

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Please see the EmotivPRO User Manual for a detailed explanation. The values are expressed in microvolts but converted directly from a 14-bit unsigned integer. The DC level is offset by approximately 4100 uV, but the absolute value of the offset can be affected by slow DC drift so we do not attempt to correct it. Please apply a high-pass filter to the data – we recommend a characteristic cutoff around 0.16 Hz or greater.