Figure 2. Percentage of volunteers with subjective motor weakness (right) and decreased or absent deep tendon reflexes (left) in upper extremities (top) or lower extremities (bottom) after spinal injection of neostigmine at time 0, 50 micro gram (open square), 150 micro gram (closed circle), 500 micro gram (open triangle), or 750 micro gram (inverted closed triangle) in part 1.