Responses of five different units to head AM, trunk AM, joint AM, head PM, and trunk PM. A, This AM-DPM-sensitive unit gave identical responses to head AM and joint AM, gave no response to trunk AM, and responded to head advances and trunk delays. Vertical scale, 114 spikes/sec. B, This DAM-sensitive unit gave an I-type response in the head, an E-type response in the trunk, a weakened response to joint AM, and no response to PM in either compartment. Vertical scale, 20.1 spikes/sec. C, This DAM-DPM-sensitive unit gave an E/delay-type response in the head, an I/advance-type response in the trunk, and a weakened response to joint AM. Vertical scale, 61.8 spikes/sec. D, This unit was DAM and DPM sensitive, giving an I/delay-type response in the head, an E/advance-type response in the trunk, and a weakened response to joint AM. Vertical scale, 44.4 spikes/sec. E, This unit was DAM and DPM sensitive, giving an I/delay-type response in the head, an E/advance-type response in the trunk, and a weakened response to joint AM. Vertical scale, 37.2 spikes/sec.