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The effect of conditioning stimulation of the central amygdaloid nucleus (ACE) on the response of tooth pulp-driven (TPD) neurons in the first somatosensory cortex (SI) was investigated in cats anesthetized with N2O-O2 (2:1) and 0.5% halothane. The tooth pulp test stimulus was a single 30-450 microA rectangular pulse, and the conditioning stimuli of the ACE were trains of 33 pulses (300 microA) delivered at 330 Hz. The ACE conditioning stimulation markedly suppressed the response of the slow-type neurons with latencies of more than 20 ms without any effect on the discharges of fast-type TPD neurons and spontaneous discharges. This inhibition was 68.9 +/- 24.7% (mean +/- SD) of the control. These findings suggest that there are at least two pathways for the ascending pulpal (nociceptive) information to the SI, and that the ACE modulates the transmission of impulses in one of the pathways.

Effect of Electrical Stimulation of the Central Amygdaloid Nucleus on the Nociceptive Neuron of the Cortex (SI) in the Cat.