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Somatosensory Responses 

Somatosensory Responses
Chapter:
Somatosensory Responses
Author(s):

Riitta Hari

, and Aina Puce

DOI:
10.1093/med/9780190497774.003.0014
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date: 25 February 2021

After a peripheral somatosensory stimulus, such as a touch to the finger, a compound action potential volley begins to travel along the peripheral nerve, first to the spinal cord, and then onward to the thalamus and somatosensory cortex. Both transient and steady-state somatosensory evoked responses can be followed with MEG and EEG from the periphery (e.g. fingers and wrist) to elbow, trunk, vertebral processes, and primary and second somatosensory cortices. Somatosensory stimulation can include small electric pulses applied to peripheral nerves and tactile and vibratory stimulation delivered to the skin. Evoked responses to noxious laser-heat stimuli can be used to study brain mechanisms of acute pain.

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