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l - 00022 - common senses Flavors aromas and chemical...

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6 common senses Flavors, aromas, and chemical signals released from animals can make the mouth water, evoke vivid memories, and perhaps even signal stress or fertility. How does the brain sort it all out? Twenty-five years ago, the physician and writer Lewis Thomas predicted that the progress of biological research would be measured by how long it took to gain a complete understanding of odor. “It may not seem a profound enough problem to dominate all the life sciences,” he observed, “but it contains, piece by piece, all the mysteries.” Chemical Senses • Taste Astringency (tactile sensation) Pungency (Pain/ Irritation) • Smell In parallel with the main olfactory system used for odor sensing, evolution has
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