the second somatosensory area (sli) has been studied both by electrical evoked potentials24 and magnetoencephalography (meg)5 magnetic evoked fields of contralateral primary somatosensory and ipsilateral second somatosensory cortices of 12 normal subjects were recorded in response to median nerve electrical stimulation by means of a single magnetometer. we detected. in addition to the usual con...

The second somatosensory area (SlI) has been studied both by electrical evoked potentials24 and magnetoencephalography (MEG)5 Magnetic evoked fields of contralateral primary somatosensory and ipsilateral second somatosensory cortices of 12 normal subjects were recorded in response to median nerve electrical stimulation by means of a single magnetometer. We detected. in addition to the usua...

We have discovered a ca. 40-Hz transient magnetic oscillatory response, evoked in the human brain by the onset of auditory stimuli, consisting of four or more cycles locked in phase to stimulus onset in approximately the 20- to 130-ms poststimulus interval. The response originates in the supratemporal auditory cortex, some millimeters deeper and anterior to the source of the larger-amplitude sl...

Magnetoencephalography (MEG) is generally dealing with cortical sources, since the sensitivity of MEG declines rapidly with increasing source depth. Two factors are responsible for this loss of sensitivity. First, the amplitude of the measured MEG is inversely proportional to the squared distance between sensors and source, and this distance naturally increases with source depth. Second, the ME...