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Acute spinal cats were immobilized with lesions which produced either high or low mean arterial blood pressures. These animals were assigned to classical conditioning or sensitization paradigms in which the conditioned and unconditioned stimuli (CS and US) were shocks to two different cutaneous nerves of the left hindlimb. Conditioned and unconditioned responses were flexion reflex tensions recorded from the isolated tibialis anterior muscle of the same leg. Three different US intensities were employed for both conditioning and sensitization groups. While conditioning animals received paired stimuli, sensitization animals received either a pseudorandom or an alternating schedule of unpaired CS and US presentations. Spinal cats receiving US intensities which activated at least Aα and Aδ cutaneous afferents showed greater flexion reflex facilitation during the conditioning paradigm than in the sensitization paradigm. The addition of C fiber activation to the Aαδ US produced no additional influence on net conditioning. A US intensity which activated only Aα fibers did not produce facilitation in either conditioning or sensitization paradigms. High- and low-blood-pressure groups behaved similarly, demonstrating the independence of spinal conditioning from this physiological factor over the range observed. No differences were observed between alternating and pseudorandom sensitization control groups.

US intensity and blood-pressure effects on classical conditioning and sensitization in spinal cat