Electroencephalography (EEG) is one of the most used tools in neuromarketing research, after fMRI. It captures variations in brainwaves, and the amplitudes of the recorded brainwaves correspond to certain mental states, such as wakefulness (beta waves), relaxation (alpha waves), calmness (theta waves) and sleep (delta waves). Morin (2011) notes that the measure of alpha-band waves (8-13 Hz) in the left frontal lobe indicated
positive emotions, speculating that this is a good predictor of how motivated we are to act. A number of electrodes (up to 256) are placed on the scalp of the subjects, in certain areas, in order to measure and record the electricity for that certain spot. For the analysis, voltage and frequency are measured for each subject and compared to the data that was recorded without using marketing stimuli. Technology allows EEG to be a portable
device and record brain activity in any many circumstances, as for example in supermarkets