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INTRODUCTION
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We now perceive the subordination of the sensory areas of the brain and the major portion of the surface of the brain assigned to motor functions to the functions of the association of different centres. Thereafter we find that the so-called silent centres otherwise called association centres of the brain becoming the dominant area of the brain, and they are at the maximum in the human brain, thus indicating that they form the functional basis of consciousness which is the fundamental characteristic of man. Thus the process of building up the body for the purpose of serving as a vehicle for the expression of consciousness, which seems to be the guiding principle in the whole process of evolution. This principle is generally recognised by modern biologists who refute the inadequacy of Darwinian theory of natural selection based upon mere mechanical environment.
Let us confine ourselves to human brain. Here you have the centres representing the various sense-organs of the periphery, the motor centres controlling the various systems of the body and besides these large tracks of association centres which cover the major portion of the brain area. Modern physiologists recognise the importance of their association areas and they believe that the same form the physiological basis of conscious activity. But the psychological development and especially the study of abnormal psy. chology brought to the forefront certain important facts, which necessitate the modification of the theory postulating that conscious activity is generally based upon physiological functions of the different centres of the brain, sensory and motor. Since these facts indicate that sometimes consciousness functioning in a mysterious way completely transcends the activity of the brain this result is obtained from two independent sources. Mental disorders brought about by violent shock or accident are observed in cases where the medical men were not able to detect any injury to the brain. A person falling from his dogcart, was found to be completely devoid of his past memory. He was not even able to speak. His condition was just like that of a baby incapable of uttering coherent words and incapable of recognising familiar objects. In this case, the medical men were not able to find any damage to the brain and they were in a fix to account for this tragic wiping out of past memories. The case was finally taken up by a psychologist. He began to teach this patient a few words and made him understand few objects in the environment. Thus he was equipped with a few words to carry on conversation. Then he was subjected to hypnotic treatment and to the great surprise of the psychologist the patient when in hypnotic sleep remembered all his past experince vaguely as if in a dream. Feeling glad that the past memory is not altogether wiped off, the treatment was continued for some time, the patient was given the post-hypnotic suggestion that he would remember all the past experiences which he vaguely recognised as dreams in the hypnotic trance. When the patient woke up to normal consciousness from the hypnotic sleep, to his great joy, he remembered the whole of his past
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