monads by saying that they had energy and a consciousness of their own. Likewise, according to Herbart, ideas strive for consciousness. Those ideas compatible with a person's apperceptive mass are given conscious expression, whereas those that are not remain below the limen in the unconscious mind. Herbart is considered to be one of the first Mathematical and Educational psychologists .
Bell-Magendie law by demonstrating that each sense receptor, when stimulated, releases an energy specific to that particular receptor. This finding is called The Doctrine of specific nerve energies.
Psychology called Behaviorism which is the study of overt behavior rather than of mental processes. Watson believed that infants' minds were essentially "blank slates" and argued that learning determines what people will become. Likewise, Watson assumed that with the correct techniques, anything could be learned by almost anyone. Therefore, in Watson's view, experiences was just about all that matters in determining the course of development . John B. Watson 's view that a science or theory of development must study observable behavior only and investigate relationships between stimuli and responses. Behaviorism is a theoretical approach that seeks to explain behavior in terms of learning principles, without reference to inner states, thoughts, or feelings .