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Related Experiment Video

Updated: Jul 20, 2026

Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology

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Bitter taste in aging: compound-specific decline in sensitivity

B J Cowart¹, Y Yokomukai, G K Beauchamp

¹Monell Chemical Senses Center, Philadelphia, PA 19104-3308.

Physiology & Behavior

|December 1, 1994

Summary

Aging reduces sensitivity to quinine bitterness but not urea bitterness in adults. This suggests different bitter taste pathways are affected differently by aging.

Area of Science:

Gerontology
Sensory Science
Taste Perception

Background:

Taste perception, particularly bitterness, can change with age.
Previous research indicates age-related declines in taste sensitivity.
The specific mechanisms and differential effects on various bitter compounds are not fully understood.

Purpose of the Study:

To investigate age-related differences in sensitivity to two bitter compounds: quinine sulfate and urea.
To determine if aging affects the perception of bitterness from quinine and urea differently.
To explore the implications for multiple bitter taste transduction pathways.

Main Methods:

Assessed threshold sensitivity and perceived intensity of quinine sulfate and urea.
Compared taste responses between a group of young adults and a group of elderly adults.

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Published on: April 21, 2021

Utilized psychophysical methods to quantify taste perception.

Main Results:

Elderly adults showed significantly reduced sensitivity to quinine bitterness at both threshold and suprathreshold levels compared to young adults.
Sensitivity to the bitterness of urea was comparable between young and elderly adult groups.
These findings highlight a differential impact of aging on the perception of different bitter compounds.

Conclusions:

The results support the existence of multiple bitter taste transduction mechanisms in humans.
Aging appears to differentially affect these distinct bitter taste pathways.
Further research into specific transduction sequences affected by aging is warranted.