The inhibitory effects of cutaneous thermal stimulation have been tested on background and noxious-evoked discharge of neurones in the lumbar spinal cord of anaesthetized rats. Inhibition of background discharges by warming and of noxiousevoked discharges by warming and/or cooling have been demonstrated. Thermal inhibition may be a neural basis for thermal analgesia.
Department of Veterinary Physiology, University of Edinburgh, Edinburgh EH9 1QH U.K.
1Present address: Department of Animal Physiology, University of Nairobi, P.O. Box 30197, Nairobi, Kenya.
Submitted November 29, 1983; accepted October 22, 1984.