At the onset of puberty the grey matter reaches maximum thickness and that key process of maturation, neuronal pruning, begins in the adolescent brain. This process does not occur uniformly across the whole brain but instead starts at the back of the brain and gradually progresses towards the front of the brain over a period of several years.
Neuroplasticity – the ability of the brain to adapt to the specific demands of the environments in which a person spends their waking hours. It occurs via reinforcement of connections between some brain cells (neurons) and weakening those between others.
In the womb, brain development occurs at a startling pace. Seven weeks after conception the nervous system is sufficiently developed for the foetus to translate detection of gentle brushing of the nose and lips into a reflexive movement of its head away from the stimulus.