Table 1.

Questions regarding second-order sensorimotor experiences

1. Somatic sensation in the motor cortex evoked by stimulation subthreshold for movement:

• Do you feel anything on or in your body when I stimulate here? Can you describe the feeling?

• Was it on your skin? If so, where on your skin?

• Was it a movement of your body? If so, movement of what part in what direction and how far?

• Was it a sensation inside your chest or stomach?

• How would you rate the naturalness of the sensation from 10 (completely natural) to 0 (completely unnatural)?

• When the stimulation is increased to evoke a movement, how does that movement compare to the sensation evoked by lower intensity stimulation?

2. When a movement is evoked:

• Do you know that part of your body just moved?

• What part?

• In what direction?

• How would you rate the naturalness of the movement from 10 (completely natural) to 0 (completely unnatural)?

• Did you make that movement, or did I [the investigator] cause it?

3. Intention and agency evoked by stimulation subthreshold for evoking movement per se:

• Did you feel an urge, desire, or intention to move or a feeling that you were about to make a movement?

• If so, of what part of your body and in what direction?

• If you wanted to, why did you not make that movement?

• If you had made the movement, would it have been you making the movement or me [the investigator] causing the movement?

•If I [the investigator] increase the intensity of stimulation, does that movement occur, or a different movement?