The study of the magnetic field of the human brain is one of the most fruitful areas of work in biomagnetism. It is but one facet of the many advances being made today in illuminating the structure and function of the brain. In the past decade we have witnessed the introduction of radioisotope techniques and positron emission tomography and their dramatic ability to localize regions of relatively high metabolism. These methods join the betterestablished x-ray tomography which is capable of displaying the three-dimensional aspets of anatomical features of the brain with remarkable clarity. The extremely promising method of nuclear magnetic resonance tomography is already comparable in spatial resolution and it is bound to be less harmful to the patient. This impressive array of physical methods is enhanced by the introduction of neurochemical procedures capable of revealing the relationship between synaptic transmission and the functioning of areas of the brain involved in sensory processes.
KeywordsSpatial Frequency Receptive Field Temporal Frequency Contingent Negative Variation Auditory Evoke Potential
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