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- W2065704974 abstract "Abstract Characteristics of first and second pain (human subjects) and flexion reflexes (spinal cats) were studied to assess their consistency with dorsal horn cell responses to cutaneous A and C fiber stimulation. For both experiments, two percutaneous electrical shock intensities were used to activate only A fibers and both A and C fibers. Selective block of ulnar nerve impulses necessary for first (pricking) pain was achieved by pressure to the ventral forearm. During blockade, sensation thresholds to shock and graded von Fry hairs increased progressively. After about 40 min, touch, first pain, and pinprick were no longer perceived, but long-latency (> 1 sec) burning sensations due to intense shocks and strong pinch persisted. Differences in reaction time to first and second pain indicated that second pain was related to impulses conducting between 0.8 and 1.6 m/sec (mean = 1.3 m/sec). Sensations of second pain increased with each successive shock if stimulus frequencies were greater than 0.3/sec. These progressive increases occurred both before and after blockade of first pain but not with shock intensities sufficient only to produce first pain. Second pain could be selectively suppressed by mildly painful clamping of adjacent or contralateral digits. A similar analysis applied to flexion reflexes showed that late (or second) flexion reflexes increased progressively when C fibers were activated and when shock frequency exceeded 0.3/sec. The stimulus intensities and frequencies of shocks producing progressively more intense second pain and late flexion reflexes are consistent with previously observed increases in dorsal horn responses to iterative C fiber stimulation." @default.
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- W2065704974 date "1972-11-01" @default.
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- W2065704974 title "Characteristics of second pain and flexion reflexes indicative of prolonged central summation" @default.
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- W2065704974 doi "https://doi.org/10.1016/0014-4886(72)90081-7" @default.
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