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Plasticity refers to the process of making long-term changes in the brain. Often these changes occur as a result of learning. During development (the period of intense growth and change from conception through early childhood), neurons can change shape, location, function, and patterns interconnection. In the adult brain, neurons are less able to change location and function, but plasticity still occurs. For example, intensive practice of a motor skill involving fine finger movements (e.g. playing the guitar) may result in an increase in the number of neurons that are devoted to motor control of the fingers.
rigidity Rigidity is a quality found in people and objects that don't bend â though they might eventually break. When we see rigidity in a person, it means they're severe, like a teacher who punishes you for being late even though you were busy saving an orphan from a polar bear. Rigidity means no bending â in that case, of the rules. Objects and substances can have rigidity as well, if they literally won't bend. Rigidity means about the same thing as inflexibility, another word that describes rock-solid, unyielding people and substances.