Abstract
This chapter discusses the various aspects of the nervous system. The higher functions of brain include learning, thinking, and consciousness. The brain activity is started by external influences, through our senses. Primary receptors in the form of macromolecules provide a chemical activity that in turn influences proteins that regulate the activity of the nerve cells. Strong and repeated influences can modify the connections between neurons and stabilize the activity patterns that are said to be the basis of memories. Such an activity, which provides and stabilizes memory patterns, can be apprehended as learning. Eventually, the neural activity yields an output. A primary output may be a chemical signal, which by macromolecules may be transferred into a mechanical action. The identification of a memory to a certain activated pattern in the network means that the brain does not need a complete picture for recognition. Some aspects on learning and thinking can advantageously be regarded from the principles of biological evolution.
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