Phylogenetic Association in Relation to Certain Medical Problems

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The effect upon the organism of the representation of injury or of the perception of danger through the distance receptors is designated fear. Fear is as widely distributed in nature as is its cause, that is, fear is as widely dis- tributed as injury. Animals under the stimulus of fear, according to W. T. Hornaday, not only may exhibit preternatural strength, but also show strategy of the highest order, a strategy not seen under a lesser stimulus. In some animals fear is so intense that it defe...ats escape ; this is especially true in the case of birds in the presence of snakes. The power of flight has endowed the bird with an easy means of escape from snakes, especially when the encounter is in the tops of trees. Here the snake must move cautiously else he will lose his equilibrium. His method of attack is by stealth. When the snake has stalked its prey, the bird is often so overcome by fear that it can- not fly and so becomes an easy victim. The phe- nomena of fear are described by Darwin as follows : " Fear is often preceded by astonishment and is so near akin to it that both lead to the senses of sight and hearing being instantly aroused.

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