Abstract
1. 1. After a Ringer-adapted frog tongue was stimulated with quinine-HCl (Q-HCl), rinsing the tongue with the Ringer produced a large off-response in the glossopharyngeal nerve. 2. 2. The off-response was caused by the enhancing action of Q-HCl stimulation upon the stimulating effectiveness of an NaCl component of Ringer solution. 3. 3. Analysis of gustatory neural unit responses showed that following Q-HCl stimulation the enhancement of responses to Ringer of those units which responded to both Q-HCl and Ringer or Ringer alone is related to the generation of the off-response. 4. 4. A phasic off-depolarization of taste cells elicited by a Ringer rinse following Q-HCl stimulation is thought to be associated with the off-response in the gustatory nerve.
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