Abstract
The thermal responses of 70 medial pontomedullary neurons were studied using 0.15°C/s ramp thermal stimuli applied to the glabrous skin on the ventral surface of the hindpaw of rats. Fifty-two neurons (74%) responded to an ipsilateral and/or contralateral thermal stimulus by increased action potential discharge rates. Eleven units (16%) responded by decreasing their discharge. The remaining 7 units (10%) were unaffected. The thresholds of 61 neurons responsive to thermal stimulation of the ipsilateral hindpaw ranged from 36.5 to 46°C. Ninety percent of thermally responsive neurons had bilateral receptive fields. The thresholds of the ipsilateral and contralateral responses were significantly positively correlated.
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