ROBERT GOLDSTEIN / SCIENCE PHOTO LIBRARY. ROBERT GOLDSTEIN / SCIENCE PHOTO LIBRARY.
Woman undergoing biofeedback therapy, showing her seated with a series of electrodes atached to her forehead. Biofeedback is a technique whereby an auditory or visual stimulus follows on from a physiological response. For example the electrodes might be used to measure the woman's pulse rate, and the value of different rates indicated to the woman by means of coloured lights; this may allow her to control her heart rate by distinguishing between the different colours. How the technique works is unclear, but it is claimed that it can control pulse rate & blood pressure, relax spastic muscles and also control migraine (severe headache) attacks.
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