TENS

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TENS

[Transcutaneous electrical nerve stimulation wikipedia


from the (pretty nasty) HaD comment section
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lols

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https://archive.is/gcEi8


Thermal Grill Illusion

Thunberg's (1896) thermal grill evokes a burning, ice-like pain sensation with interlaced innocuous warm (40 °C) and cool (20 °C) bars. A similar, albeit stronger, sensation is elicited by pouring warm water on feet that are numb with cold (an unmistakable signal of thermoregulatory distress), and only burning pain is evoked by a cool stimulus (<24 °C) when A-fibre conduction (and normal cool sensation) is blocked by pressure on a peripheral nerve. These demonstrations reveal two basic phenomena: the increasing activation of the polymodal C-nociceptive sensory channel by cold below a threshold of approx24 °C (the normal thermoneutral ambient temperature), and the central inhibition of that activity by innocuous thermosensory activity ('cold inhibits pain'). archive.is

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