. Laboratory problems in civic biology. Biology. 256 BODY CONTROL AND HABIT FORMATION ing for something it wanted. This would in a way be an instinc- tive act. Can you explain how? When you first learned to write, did you think about making the letters of the words you wrote? Do you now? How do you account for the ease with which you now write? What is the chief difference between the instinctive act of the baby learning to walk and the act of writing? Do we think about writing now ? Did we think about it when we began to learn ? An act consciously repeated many times eventually becomes a habi


. Laboratory problems in civic biology. Biology. 256 BODY CONTROL AND HABIT FORMATION ing for something it wanted. This would in a way be an instinc- tive act. Can you explain how? When you first learned to write, did you think about making the letters of the words you wrote? Do you now? How do you account for the ease with which you now write? What is the chief difference between the instinctive act of the baby learning to walk and the act of writing? Do we think about writing now ? Did we think about it when we began to learn ? An act consciously repeated many times eventually becomes a habit. Might a habit be formed through the unconscious repeti- tion of an act? Conclusion. — 1. What is an instinct? 2. What is a habit? How might it be formed? 3. What is the difference between instinct and habit ? Problem 228: To study the mechanism of habit formation. Note. — The formation of a habit involves the simplifying of a complicated process. In an act of thought, , picking up a toothbrush from the washstand (see diagram) the eye sees the brush and relays the message through some sight cells to a nerve center in the back of the brain (). From there the message is again relayed to (), where the impulse is originated to pick the brush up. This results in a message being sent by another relay of several sets of cells down the spinal cord to the muscles of the arm where the fibers from this neuron end in the muscles. Now if the act becomes habitual, as it does when we brush our teeth each morning, the stimulus caused by the sight of the brush causes a short circuit of the impulse which goes to and then directly down the spinal cord. Conclusion. — 1. If il/.C is the thought center, then what does habit forming do? 2. Would it be better to make a problem of brushing your teeth each morning or to do it auto- matically (by habit) ? 3. Just how is a habit formed in the nervous center? 4. Of what advantage are habits ?. The Course taken bt the Act of Thought


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