Polygraphic records of EEG, EOG, and EMGs from 3 neck muscles before and various times after unilateral IBO injection into R-P3 in unanesthetized cat (ST-5). Note that after IBO injection, excitation of ipsilateral neck muscles (top right, Acute phase I) is followed by that of contralateral muscles (bottom left, Acute phase II) and then by normal EMGs (bottom right, Chronic phase). R, right; L, left; SPL, splenius; Biv, biventer cervicis; Com, complexus. Voltage calibration for R-SPL also applies to other EMG traces.