Perceived sensations elicited from small-scale pulse width modulation on all available channels.. Constant pressure sensation was commonly associated with glabrous skin location on the perceived hand.
Median | Ulnar | Radial | ||||||
Ch. | Perceived location skin type | Small-scale PW modulation sensation | Ch. | Perceived location skin type | Small-scale PW modulation sensation | Ch. | Perceived location skin type | Small-scale PW modulation sensation |
M1 | Hairy | Itch, tingle, pulse | U1 | Hairy | Constant vibration | R1 | Hairy | Tingling |
M2 | Glabrous | Constant pressure | U2 | — | No response | R2 | Hairy | Constant pressure |
M3 | Glabrous | Constant pressure | U3 | Glabrous, hairy | Tingling | R3 | Hairy | Tingling |
M4 | Glabrous | Constant pressure | U4 | Hairy | Tingling | R4 | Hairy | Hair movement, cotton ball |
M5 | Glabrous | Constant pressure | U5 | Glabrous | Constant pressure, Itch | |||
M6 | Deep | N.T.* | U6 | Glabrous, hairy | Constant pressure | |||
M7 | Hairy | Constant pressure | U7 | Glabrous | Constant pressure | |||
M8 | Glabrous, hairy | Constant pressure | U8 | — | N.T.† |
*Not tested: usually stimulation on M6 resulted in uncomfortable sensations.
†Not tested: connector needed replacement. External connector lasted 1.6 years before requiring simple replacement.