A brain function measuring apparatus is provided with a differential or balanced type detector or magnetic field gradient generator having at least one pair of coils for detecting resonance signals, the coils being positioned symmetrically on the left and right relative to the median line of the head of the subject who is being examined. The configuration is such that when the organism is quiet and at rest, there is no output from the detector, and when there is brain activity the state and location of the brain activity, and also higher brain functions, can be identified with high resolution from the amplitude and phase of the resonance signal differential component output from the detector.
Apparatus for measuring brain function using nuclear magnetic resonance