Simultaneous stimulation of intraneural electrodes. (A), (B), and (C) show an example from Cat0502, in which there was little overlap of spatial tuning curves. In that example, simultaneous stimulation at two sites (B) resulted in minimal reduction of threshold. (D), (E), and (F) show an example from Cat0601, in which there was considerable overlap of spatial tuning curves. In that case, simultaneous stimulation of the two individual sites resulted in a threshold reduction of ∼4 dB.