TABLE 1.

Selected verbal descriptions of stimulation-evoked sensation given by participants.

Participant	Electrode pair	Current intensity (mA)	Description of sensation
A	A1	1.8T	Sense of a flick on a narrow portion of the right side of the tip of my tongue. Feels like movement [on my tongue].
A	A1	2.0	The surface of the right side of the tip of my tongue feels numb. It’s as if I’m eating pineapple, but there’s no taste. The surface feels numb.
A	A1	2.2	The feeling [of numbness] on the right-side of the tip of my tongue spread from front to back.
A	A1	2.8	It feels like my tongue is swollen like after being bitten.
A	A2	1.9T	Not a feeling of being touched; a bad feeling [around the second joint of the thumb].
A	A2	2.0	Feels like a blood vessel pulsing [in my thumb], not like anything I’ve felt in the past. Feels like stimulation by a low frequency electrical stimulation therapy device around the second joint of the thumb.
A	A2	2.5	Outer side of my thumb feels anaesthetized.
A	A2	2.7	A slow dull touch on the opposite hand. Also, my finger feels swollen and thick.
B	B1	1.9T	The palm under my left little finger is being pressed. The spot moved a little inwards [to the center of my palm].
B	B1	2.0	It’s being pressed down in a few spots [on my palm] but the overall width is the same [as 1.9 mA].
B	B1	2.5	It feels faster. The width is the same.
B	B1	3.0	The width increased.
B	B2	1.6T	[no verbal description given by participant; VAS response only]
B	B2	1.7	I feel pressure at two spots on the [ulnar] side of my palm.
B	B2	2.3	It sped up, and got stronger [than at 1.9 mA]. The width is unclear.
B	B2	2.7	It got even faster, but the width is the same. It feels like something is really strongly pressing [into my skin].

For electrode pair definitions (see Figure 5). Original responses were given in Japanese. Text in square brackets was not said by participants but is included for clarity. ^TIndicates PT for that electrode pair.