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Table 1 Subjective description of the proprioceptive illusion effect for all subjects

From: A new approach of inducing proprioceptive illusion by transcutaneous electrical stimulation

Subject

Intensity*

Description of proprioceptive illusion

Description of unnatural sensation

#1

3

Forearm is pushed down by external force

Tingling, vibrating, paresthesia

#2

3

Forearm is moving downward

Vibrating/scratching on the skin

Tingling, vibrating, pulsing, paresthesia

#3

3

Forearm is moving downward

Vibrating on the skin

Tingling, vibrating

#4

3

Forearm is pushed down by external force

Tingling

#5

3

Forearm is pushed down by external weight Vibrating/scratching on the skin

Tingling, itchiness

#6

4

Forearm is moving downward

Tingling

#7

4

Forearm is pushed down by external force

Tingling

#8

3

Forearm is moving downward

Tingling, pulsing

  1. Intensity and subjects’ description of the proprioceptive illusion, along with subjects’ description of the unnatural electrotactile sensation accompanied with the proprioceptive illusion
  2. *Intensity of proprioceptive illusion on 1–5 scale (1—nothing, 2-—barely perceivable, 3—perceivable, 4—strong, 5—very strong)