Somatosensory Evoked Potentials

The somatosensory evoked potentials (SEPs), reflect the activity of cortical regions of somatosensory projections, and thus, in the initial stages, of the functional ity of the somatesthetic systems. Most of the components that indicate the different stages of both sensory and cognitive processing of the somatesthetic inputs are shown in Fig. 10a. The positive components P10, P12, P13, and P14, not represented in the figure and indicating the very early latency of the first phases of the...

The Meg Laboratory

A magnetoencephalography (MEG) laboratory is very similar to an electro-physiology laboratory but does have some particular characteristics that distinguish it. Figure 2 offers an example of a possible setup of such a laboratory with its different components. A detail of the magnetically shielded room (A) can be seen in the upper right. The volunteer and the Dewar probe (C) are inside this room during the experiments and recordings. The walls of the room are made of sheets of aluminium, which...

Bipolar And Monopolar Recordings

Linked Ear Montage

The electrodes may be connected together into several different kinds of bipolar and monopolar montages. In bipolar montages all electrodes are connected together in chains, with the second input to one channel becoming the first input to the next channel. The most common use of a bipolar montage is to record the electrooculogram. In this case horizontal eye movements are recorded by means of two electrodes placed at the external canthus of the left and right eyes, and blinks and vertical eye...