Ontario Normal School Manuals: Science of Education

by Ontario. Department of Education

INSTINCT

Definition of Instinct.—In a foregoing section, it was seen that our bodily movements divide into different classes according to their source, or origin. Among them were noted certain inherited spontaneous, but useful, complex movements which follow, in a more or less uniform way, definite types of stimuli presented to the organism. Such an inherited tendency on the part of an organism to react in an effective manner, but without any definite purpose in view, whenever a particular stimulus presents itself, is known as instinct, and the resulting action is described as an instinctive act. As an example of purely instinctive action may be taken the maternal instinct of insects whose larvæ require live prey when they are born. To provide this the mother administers sufficient poison to a spider or a caterpillar to stupefy it, and then bears it to her nest. Placing the victim close to her eggs, she incloses the two together, thus providing food for her future offspring. This complex series of acts, so essential to the continuance of the species, and seemingly so full of purpose, is nevertheless conducted throughout without reference to past experience, and without any future end in view. Instinct may, therefore, be defined as the ability of an organism to react upon a particular situation so as to gain a desirable end, yet without any purpose in view or any previous training.

Characteristics of Instinct.—An instinctive act, it may be noted, is distinguished by certain well marked characteristics:

1. The action is not brought about by experience or guided by intelligence, but is a direct reaction on the part of the organism to definite stimulation.

2. Although not the result of reason, instinctive action is purposeful to the extent that it shows a predisposition on the part of the organism to react in an effective manner to a particular situation.

3. An instinctive movement is a response in which the whole organism is concerned. It is the discomfort of the whole organism, for instance, that causes the bird to migrate or the child to seek food. In this respect it differs from a mere reflex action such as the winking of the eye, breathing, coughing, etc., which involves only some particular part of the organism.

4. Although not a consciously purposed action, instinct nevertheless involves consciousness. In sucking, for instance, sensation accompanies both the discomfort of the organism giving rise to the movements and also the instinctive act itself. In this respect it differs from such automatic actions as breathing, the circulation of the blood, and the beating of the heart.

Origin of Instinct.—The various instinctive movements with which an organism is endowed, not being a result of experience or education, a question at once arises as to their source, or origin. Instinct has its origin in the fact that certain movements which have proved beneficial in the ancestral experience of the race have become established as permanent modes of reaction, and are transmitted to each succeeding generation. The explanation of this transmission of tendencies is, that beneficial movements are retained as permanent modifications of the nervous system of the animal, and are transmitted to the offspring as a reactive tendency toward definite stimuli. The partridge family, for instance, has preserved its offspring from the attacks of foxes, dogs, and other enemies only by the male taking flight and dragging itself along the ground, thus attracting the enemy away from the direction of the nest. The complex movements involved in such an act, becoming established as permanent motor connections within the system, are transmitted to the offspring as predispositions. Instinct would thus seem a physiological habit, or hereditary tendency, within the nervous system to react in a fixed manner under certain conditions. In many respects, however, instincts seem to depend more largely upon bodily development than upon nervous structure. While the babe will at first instinctively suck; yet as soon as teeth appear, the sucking at once gives way to the biting instinct. The sucking instinct then disappears so completely that only a process of education will re-establish it later. Birds also show no instinctive tendency to fly until their wings are developed, while the young of even the fiercest animals will flee from danger, until such time as their bodily organism is properly developed for attack. From this it would seem that instinctive action depends even more upon general bodily structure and development than upon fixed co-ordinations within the nervous system.

HUMAN INSTINCTS

On account of the apparently intelligent character of human actions, it is often stated that man is a creature largely devoid of instincts. The fact is, however, that he is endowed with a large number of impulsive or instinctive tendencies to act in definite ways, when in particular situations. Man has a tendency, under the proper conditions, to be fearful, bashful, angry, curious, sympathetic, grasping, etc. It is only, moreover, because experience finally gives man ideas of these instinctive movements, that they may in time be controlled by reason, and developed into orderly habits.