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Techniques for effective EEG subject preparation

Applying electrodes for the purpose of recording an electroencephalogram (EEG) can be a complicated and time-consuming task.As the purpose of theEEG is to record minute neural signals within the skull cavity, obstacles such as bone, skin and hair that lie between the source of the EEG signal and the recording electrodes on the scalp surface make artefact-free signals difficult to obtain. Previously, the application of electrodes required the careful measurement of the patient’s head to determine the precise location of individual electrodeson the scalp surface. Fortunately, nowadays it is possible to use specially designed caps (of differing sizes) that have the electrodes fixed into them at the desired locations following the international 10-20 system of electrode placement. This innovation has been a tremendous advance in EEG research as it has significantly reduced the overall set-up time required. However, despite the time saving that these caps afford, there are still other significant issues that need to be addressed to record artefactfree EEG. The purpose of this issue’s Brain Bytes is to explore effective techniques for timely EEG subject preparation.