6commonsensesFlavors, aromas, and chemical signalsreleased from animalscan make the mouth water, evoke vividmemories, and perhaps even signal stressor fertility. How does the brain sort it all out?Twenty-five years ago, the physicianand writer Lewis Thomas predicted thatthe progress of biological researchwould be measured by how long it tookto gain a complete understanding ofodor. “It may not seem a profoundenough problem to dominate all the lifesciences,” he observed, “but it contains,piece by piece, all the mysteries.”Chemical Senses• Taste•Astringency (tactile sensation)•Pungency (Pain/ Irritation)• SmellIn parallel with the main olfactory system used for odor sensing, evolution has
This is the end of the preview.
access the rest of the document.
Lewis Thomas, writer Lewis Thomas, Taste Astringency