Photic stimulation for selective entrainment of brain oscillations: Researchers at the University of Oxford are looking for healthy volunteers (20 to 60 years old) for a study involving brain wave recordings and photic stimulation (light flashes) at rest. You will be reimbursed for your time, and there is no need to commit to multiple sessions. Please write to photic-study@bndu.ox.ac.uk for more details (CUREC Approval Reference: R93268/RE002)."