An interesting point about the stage of incubation is that ``the unconscious process can be facilitated by taking time off from the problem . Wallas noted that to assist to incubation one has to either switch on to working at another problem or withdraw from problem -solving for a while , for example by doing physical exercise . It should be mentioned however , that there is a theory , which is alternative to that of stage theories . It is Wertheimer 's gestalt theory of...











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