Activation of the ICC and ICX in response to somatic stimulation alone. The percentages of ICC (n=143) and ICX (n=155) recording sites that showed excitatory activity in response to each stimulated somatic site at 560 μA are presented. For all stimulation sites, a higher percentage of ICX recording sites showed excitatory responses than ICC recording sites. All percentages represent the number of sites in a given region that showed activity divided by the total number of recording sites in that region. Abbreviations: T-tongue, N-neck, LS-left shoulder, RS-right shoulder, B-back, LL-left hind leg, RL-right hind leg, G-genital area.