Neuroplasticity

Neuroplasticity is the ability of the brain to change its default activity in response to stimuli by reorganizing how it works by modifying its connectivity. Humans lose their neuroplasticity as they age (see figure 1), keep in mind this is a bell curve distribution and recent studies have shown this change can be reversed by types of shock.

Figure 1. Neuroplasticity Vs Age.

The brain is neurochemical in nature i.e. part chemical and part electric. When these combine they work like hiking trails. The ones that get a lot of traffic get smoother and wider, with brush stomped down and pushed back. The neural pathways that sit unused grow over, becoming less likely to be used. Your brain uses the more accessible pathways as it takes lower energy to do so.