Paris-Lodron Universitat Salzburg 1 article published in JoVE Neuroscience Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography Elie Rassi1, Marco Fuscà1, Nathan Weisz1, Gianpaolo Demarchi1 1Center for Cognitive Neuroscience, Paris-Lodron Universität Salzburg This article describes how to set up an experiment that allows detecting pre-stimulus source-level influences on object perception using magnetoencephalography (MEG). It covers stimulus material, experimental design, MEG recording, and data analysis.