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Abstract: The subjects of this part of the experiments were 9—12 year old children of mental deficiency. The results indicated: 1) These children were able to have two simple connective systems function simultaneously, but if the experimental conditions were more complicated, functioning became difficult and the simultaneous function of a simple and a complex connective system was beyond the capacity of the children; 2) The connective systems might be retained at the same degree when they were established on the same level, but the complex one would be disturbed when they were established on different levels; 3) Verbal reactions to the stimulus could not compensate the motor disorder, sometimes it even deepened the disorder; 4) The weakness of the fundamental nervous processes, especially the inner inhabition, the wide irradiation of the excitatory processes, the pathological inertness of the fundamental nervous processes, the extensive negative induction, the disorder of normal interactions of two signaling systems, the weakness of the abstrative and regulative function of the second signaling system and the synthetic activities of the cerebral cortex were all shown by the subjects in the experiments.

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