External Senses by A.C. Damask (Auth.) PDF

By A.C. Damask (Auth.)

ISBN-10: 012201202X

ISBN-13: 9780122012020

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If, however, a very slight taste of food is injected into their mouth with each bar pressing, they learn rapidly and overeat. 5 "From Teitelbaum (1955). If the experimental animals have lateral hypothalamic lesions they will not be driven to eat by hunger. Only if highly palatable wet foods are offered can they be induced to eat. They must be given wet or liquid foods because they will not drink and otherwise will die of dehydration. With these palatable foods and some force feeding with tubes, the animals eventually recover.

How much salt is enough? Dahl pointed out that the low fraction in mother's milk should be adequate since millions of years of evolutionary development produced the correct dietary balance for h u m a n children. One baby food manufacturer now advertises that no salt is added to his product. The final decision will undoubtedly be made in the marketplace, and a rejection of the reduced salt product by an uneducated public will be to their ultimate disadvantage. In a country where children thrive on pretzels and potato chips, hypertension may become preferable to salt deprivation.

For water intake the situation is quite similar. W h e n quinine hydrochloride is added, the rats continue to drink it up to a concentration of 1%, which is the lethal quantity for normal water intake. The animals continue to drink it until they actually become poisoned. In order to completely remove taste and smell from the test, a feeding tube was passed through a rat's nostril directly into his stomach. The rat was taught to inject liquid food by pressing a pedal. A small a m o u n t was injected with each depression of the pedal and the food was made extremely bitter so that regurgitation was not a method of tasting.

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External Senses by A.C. Damask (Auth.)


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