SSEPs during control experiments. SSEPs were tested during a precision grip using index finger and thumb, middle finger and thumb, ring finger and thumb, and little finger and thumb (A) and during a precision grip using the index finger and thumb and a precision grip with all five digits (B) at 30% of MVC. Group data (n = 8) show the amplitude of all SSEP components (P14/N20, N20/P25, and P25/N33 in microvolts) during a precision grip using index finger and thumb (blue bars), middle finger and thumb (gray bars), ring finger and thumb (black bars), and little finger and thumb (green bars; C) and during a precision grip using the index finger and thumb (black bars) and a precision grip with all five digits (gray bars; D). Error bars indicate SE.