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I do agree that neural plasticity is a  very important brain process necessary for learning, memory, maturation of functions etc. However, I don't think the brain's neural plasticity will be able to account for the formation of new senses. The way I perceive it, the example about blind people using echolocation to navigate their environment, is not the formation of a new sense but making use of current senses we have in a different manner than usual to compensate for their loss of sight. I don't think we will ever be able to acquire new senses unless there is genetic mutation in our DNA.