A contribution to the comparative physiology of contact chemoreception.

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Abstract
Taste thresholds for several inorganic compounds, acetic acid, and sucrose were determined by various methods for the caterpillars of Eacles imperialis, the rabbit, and for man. The results show similarity in differential sensitivity for the three species tested. Using the chlorides, the stimulative effect of the cations for the caterpillar and rabbit was in the following order: Li-super(+) < Na-super(+) < Ca-super(++) < K-super(+) ≤ NH-sub(3)-super(+) << H-sub(3)O,-super(+) and the same order held for man with the exception of LiCl and HCl, which were not tested. The order of stimulative effect of the anions was, for the caterpillar, Cl-super(-) < OH-super(-), and for the rabbit, Cl-super(-) = CH-sub(3)COO-super(-) = SO-sub(4)-super(-) < Br-super(-) < I-super(-) = NO-sub(3)-super(-). The acceptance threshold of the rabbit for sucrose was similar to that found in man. "The cation and anion series found here are similar to those found previously for gustation in other insects and for cell penetration or surface effects, such as adsorption on colloidal particles. This suggests that stimulation of contact chemoreceptors is the result of penetration or surface activity." 37-item bibliography. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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