Abstract
AbstractIt is generally accepted that taste and taste‐related trigeminal chemical sensation bring up emotions that are essential for animal living and for a good quality of life, and that stress may modify sensory systems related to emotionality. The purpose of this study was to clarify (1) the effects of stress on taste and trigeminal irritant sensations, (2) effects of stress at a developing stage on these sensations. Male Wistar albino rats received 1G, 2G or 3G stimulation. Hyper‐gravity was applied with a centrifugal apparatus. The two‐bottle preference test was performed to measure chemical sensation. Adult rats received 1G (control), 2G (moderate) or 3G (strong) gravity loading every 10 min/day during 32 days. Developing rats received 3G gravity loading every 10 min/day during 45 days and were compared with 1G controls. As test solutions, taste solutions (sucrose, saccharin, citric acid, NaCl, monosodium glutamate, quinine and caffeine) and a trigeminal irritant solution (capsaicin) were used. In developing rats, but not in adult rats, hyper‐gravity stimulation increased the intake volume of sucrose, saccharin, NaCl, quinine and capsaicin, and the preference ratio for quinine, caffeine and capsaicin. It is suggested that the life stage where stress is loaded is critical for determining changes in emotionality as well as in emotion‐related sensory systems. Copyright © 2010 John Wiley & Sons, Ltd.
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