Abstract
After a sucrose solution had been previously applied to the tongue, a transient burst activity was elicited in the chorda tympani nerve with a water rinse (off-type response) in the rat. The sucrose response (on response) and the off-type response appeared in a reverse functional relation in their response magnitudes, and the addition of both responses took almost a constant value in each animal. Both the sucrose response and the off-type responses were separately suppressed by preliminary treatment of the tongue with the different metallic salts, that is, CaCl 2 suppressed only the off-type response and CuCl 2 affected only the sucrose response. These effects are not due to anions but cations. A possible mechanism for the generation of the off-type response was discussed, and two different acceptor groups in the sugar-sensitive macromolecule were hypothesized.
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