EEG Recordings in Humans

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EEG Recordings in Humans


Students may use PowerLab to record EEG signals in human subjects. The EEG provides a measure of cortical electrical activity and differs according to sleep-state, level of arousal and mental activity. Given that EEG voltage signals are relatively small (typically 50 µV peak-to-peak), a bioamplifier is necessary to preamplify and filter the small bioelectrical signals. The Bio Amp, Dual Bio Amp, and the Dual Bio Amp/Stimulator are suitable for EEG recording and have been certified for human connection. Whilst clinical studies typically record many channels of EEG activity using an EEG Electro-Cap System, it is only necessary to record a single channel of activity in student laboratories (Alpha waves can be easily recorded with your PowerLab by connecting two EEG Flat Electrodes over the frontal and occipital lobes, and a reference electrode). LabChart software can rectify and integrate the raw EEG signal and display the results on a separate channel. The RMS power content of the signal can also be calculated and displayed. The LabChart software Spectrum feature displays the power spectrum (FFT) of a selected region of data and can be used to analyze EEG signal frequencies. Students may also investigate EEG Evoked Potentials to auditory, visual and somatosensory stimuli.

Students may use PowerLab to record EEG signals in human subjects.