Elementary Psychology; A Text-Book for Normal Schools and for Teachers' Professional Reading Courses - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914. Excerpt: ... CHAPTER VIII Other Sensations The Five Senses.--It was formerly believed that there are only five senses: seeing, feeling, hearing, tasting and smelling. We have already discussed four: seeing, color, hearing and equilibrium. Each of these senses has a different end organ, different nerve, different stimulus, and Middle Circumvallate Papilla Circumvallate Papillae Fungiform Papillae Filiform Papillae Fig. 21--Taste papillae of the tongue. without any question, a different cerebral center. We shall see that there are many other senses. Taste.--The sense of taste has for its end organ the termination of nerve filaments in the tongue. Upon the tongue are found various elevations containing nerve endings, called papillae. These papillae are of various forms, the most conspicuous of which are the circumvallate papillae at the back of the tongue, which look like little craters, and are the places in which are disposed some flask-shaped bodies, the walls of which are composed of nerve cells constituting the termination of the taste nerves. Taste Buds.--Other papillae are called fungiform, and are found along the sides of the tongue. Still others are V filiform, or threadlike, and are found toward the tip. The nerve endings of these papillae are called taste buds. Only Soluble Substances Tasted.--The essential character of the papillae is the same wherever found. The substance to be tasted must be of such a nature that it is capable of being dissolved. Marble and glass cannot be tasted because they will not dissolve. Sugar and salt will dissolve, and they can be tasted. We must not, however, make the mistake of asserting that anything which will dissolve can be tasted, for some soluble things are tasteless. Substances in Solution Like Gases.--When a substance is ...

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