Isohedonic contours and tongue activity in three gustatory areas of the rat.

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Abstract
Preferences were determined by recording tongue contacts with test fluids using subthreshold electrical currents. The up-and-down psychophysical method was used to determine hedonic equality between standard and comparison solutions. Preferences were observed and isohedonic contours plotted in 3 stimulus areas--soursweet, salt-sweet, bitter-sweet--for a group of 30 nondeprived rats. Low concentrations of the non-sweet solute may facilitate tongue activity relative to sucrose standard. With high concentrations in all 3 stimulus-areas activity was inhibited. The study shows that points along an isohedon are not equal in activating potential but that standard and comparison solutions are equally activating at a particular point within a stimulus area. The characteristics of isohedons are considered. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
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