This week’s Use-Your-Head Research Photo shows Rosie Twomey of the University of Brighton engaging in “TMS (Transcranial Magnetic Stimulation) to initiate a muscular response.” Twomey’s graduate work centers on “Investigation into the Neurophysiological determinants of fatigue in graded hypoxia.” The photo is from BBC-Two’s Horizon program. The head is credited to Michael Mosley.