We will design small projects that are pertinent to the theme of scale-free brain activity and conscious/unconscious processing. We will investigate healthy volunteers in the resting state or while they perform simple motor or sensory tasks. If a hypothesis testing substudy leads to results of interest and if a larger population is necessary to reach statistical significance, a separate protocol will be submitted with a priori hypotheses, specific study design and power analysis adapted from the pilot or exploratory substudies performed in the present protocol.