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Instrumentation and procedures for detecting neuromagnetic fields evoked by sensory stimuli in an unshielded environment are described. Latencies of somatosensory and visually evoked neuromagnetic responses are compared with simple reaction times. Assuming a serial model, the RT can be divided into motor and sensory components. The latter is reflected in the neuromagnetic response. The visual neuromagnetic response has revealed two functionally distinct components that may reflect activity of sustained channels. It has also permitted isolation of two distinct cortical regions with different response properties. Latencies of resopnse of each of the two hemispheres were studied and revealed marked individual differences.
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Kaufman et al. (1980) studied this question.
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