<p>Hemoencephalography (HEG) is a method of measuring brain function by measuring the brain blood flow. Hershel Toomim first coined the term hemoencephalography in 1997. Toomim discovered that the manipulation of brain blood flow is voluntary and can be trained using neurofeedback techniques. With the sensor giving feedback of increased blood flow, we can voluntarily increase brain blood flow at the location of the sensor. HEG trains the subject to increase blood ﬂ ow to a targeted area of the brain. Neurofeedback, as we have known it so far, measures the electrical activity of the brain, EEG, as a feedback signal to be controlled by the patient. Here EEG is substituted with blood oxygenation for the same purpose.</p><p>There are two kinds of HEG, pIR and nIR (near infrared), the former is up training temperature and the latter is uptraining oxygen via interaction with an infrared light. Near-infrared HEG (nirHEG): uses a spectrophotometer to measure the oxygenated blood flow inside the skull. The bone is translucent and lets light in. The Instrument measures the amount of blood that's carrying oxygen. This is similar to the "pulse-oximeter" that is used as a finger clip in the hospital, and that shines a red light through your skin to measure the blood oxygen level.&nbsp;</p><p>The advantage to using the nirHEG is that the elastic band on the head is easily moved to any location on the scalp to train the corresponding area of the brain. HEG is used on the frontal lobes and other areas where skin is showing. it will not work when placed on the hair, however.</p><p>Unlike traditional neurofeedback, HEG is not affected by eye blinks or facial movement which cause distortion when using EEG.</p><p>Neurofeedback using this new technique provides a means to exercise selected brain areas. Exercise increases blood ﬂ ow to the chosen brain module.&nbsp; Capillaries and dendrites grow with brain exercise (Kaiser 1997, Thompson et al. 1998, Joyce and Seiver 1997, Rossiter 1996, 1996, Kaiser 1997). An audible tone was devised that increased in pitch to signify increased blood oxygenation. To increase oxygenation one would merely attend to the highest note in each trill and will the next higher note to sound. Application of the headband and monitoring patient progress is simple. The treatment process is divided into ten-minute segments. Usually three to four such segments constitute a treatment session.</p>