An EEG study typically follows several specific steps. First one sets up the experiment itself, using various software, then pre- and pilot testing may be followed by the actual data acquisition and finishing with the analysis.
Experiment Setup
While setting up an experiment one must decide which software to use for stimulus presentation. At UiO, researchers have the choice between several options: Eprime, Matlab/Psychtoolbox and Python/PsychoPy. The following table gives a short overview of the programs.
Pre-tests
Pre-tests are preliminary testing of sequences, equipment and stimuli scripts performed in the EEG lab before data collection begins.
Pilot tests
Before collecting data for the experiment, it is necessary to discuss the experiment design with colleagues and have them perform the task to give feedback on its design. Pilot test your experiment behaviorally to make sure you can obtain the predicted behavioral effect before proceeding to collect brain data.
After testing the experiment behaviorally, EEG data from 2-5 subjects are usually collected and analyzed, including the analysis corresponding to the main hypotheses. After the analysis of these datasets, flaws, suboptimal design features, extraneous conditions or the need for additional conditions may be found.
Pilot datasets can be used for the final analyses if the following criteria are met:
- The procedure/design is satisfactory.
- The experiment will not be changed after the pilot.
- The pilot participants fulfill the study's inclusion criteria.