How to Find Effects of Stimulus Processing on Event Related Brain Potentials of Close Others when Hyperscanning Partners

" The partners of each pair must be able to pass the McGill Friendship Questionnaire without communicating. Each partner is then seated in front of a screen in one of two adjacent rooms. These rooms are separated by a glass window through which participants communicate to maintain feelings of togetherness while being fitted with the EEG cap. After checking for adequate EEG signals, the glass is covered by a curtain to prevent visual communication. Then, partners must be silent but are instructed to try to feel in the presence of their partner during the entire experiment. Just before it starts, participants are told that each of them will be presented with one image at a time and that these images will occur at the same time for both of them on their own screen. They are also instructed that, for each trial, the simultaneous images will always be different. However, unbeknownst to them, trials are randomized: only half of them are consistent with this instruction and actually include two different images. These trials form the DSC, that is, the different-stimuli condition. The other half of the trials are inconsistent with the instruction. They include two identical images and form the ISC (identical-stimuli condition)."

" If the stimulus processing of one can influence the electrodynamics of the other's brain, and vice-versa, then the mean voltages of the LPP component for the inconsistent trials could be different from those of the consistent ones across sessions. Indeed, our preliminary results are in agreement with our hypothesis: the LPP values for the critical session are different from those of the control session as a function of consistency. This effect occurred in the absence of block bias and of any possible covert detection of inconsistencies due to noise from the partner, such as changes of breathing induced by shocking visual stimuli."

Last modified on 08-Jan-19

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