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Even a simple reaching action like this, when done more than once, can be guided by different sets of neurons. This phenomenon is called degenетасу. Scientists suspect that all biological systems have degeneracy. In genetics, for example, the same eye colour can be produced by different combinations of genes. Your sense of smell works by degeneracy too, and so does your immune system. Transportation systems have degeneracy as well. You can fly from London to Rome on different airlines, on different flights, on different models of air-plane, in different seats, with different flight attendants. Copilots can take over for pilots. Degeneracy in the brain means that your actions and experiences can be created in multiple ways. Each time you feel afraid, for example, your brain may construct that feeling with various sets of neurons.
Lisa Feldman Barrett, Seven and a Half Lessons About the Brain