Equipotentiality is the theory that the brain has the capacity (in the case of injury) to transfer functional memory from the damaged portion of the brain to other undamaged portions of the brain. This hypothesis, put forward by Karl Spence Lashley, is part of his law of mass action. Lashley stated the efficiency of any complex function of the brain is reduced proportionately to how much damage the brain as a whole has sustained, not to the damage of any particular area of the brain. In essence, this states that the storage capacity of the brain is flexible and much like a computer hard drive, has the capacity to move stored information to other areas if necessary.

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