Abstract
Gustatory and olfactory alliesthesia was observed in nine healthy adult humans who received on three different days an intragastric load of 50 g glucose dissolved into various amounts of water in order to make 100, 200 and 400 ml of solution. Maximal alliesthesia to sweet stimuli was observed with the smallest volume, i.e., highest concentration. Comparison of these results with previous results [7], obtained not by varying the volume but by varying the glucose mass, shows identity. Maximal alliesthesia to olfactory anchovy and Viandox R was also observed after ingestion of the most concentrated gastric load. Maximal negative alliesthesia was observed about 45 min after the gastric load; thereafter alliesthesia tended to decrease. A gastric 200 ml load containing 40 g Mannitol, a nonabsorbed sugar, was followed by a strong negative alliesthesia to alimentary stimuli. Ten g glucose in 20 ml solution produced a more intense and rapid alliesthesia when injected into the duodenum than when injected into the stomach. It may be concluded that postinjective negative alliesthesia for alimentary stimuli can be caused by intraduodenal concentration of nutrients, probably sensed by duodenal nervous chemoreceptors.
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