Abstract
3 groups of 5 dogs were prepared with esophageal fistulas and compared with 5 nonfistulated animals in acquisition of classical salivary CRs. It was possible to deliver the dilute acetic acid US to mouth, to stomach, or to both mouth and stomach, of fistulated animals. The intertrial (spontaneous) parotid secretory rate did not differ among the 4 groups. A small but significant salivary UR was observed when acid was introduced directly into S''s stomach. It was necessary to stimulate the mouth with acid before an unequivocal UR was seen. Although the size of the UR did not depend on the presence of stomach stimulation, reliable CRs were demonstrated only in those groups receiving both mouth and stomach stimulation.

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