Synchronized spontaneous brain activity: spatial and frequency content resolved via neuromagnetic measurements

Recent neuromagnetic studies indicate that suitable kinds of sensory stimulation can elicit enhanced responses correlated with underlying spontaneous activity, and that the study of these responses can shed light on the present preliminary results of a totally noninvasive neuromagnetic study on the spatial structure of these enhanced responses (in the somatosensory and visual modalities). Using the spatially discriminating capability of the neuromagnetic method, they provide evidence of the generation of these responses from the same sources responsible for the natural rhythms.<>