While people often speak of their “ grey matter“, the brain also contains white matter. It is in these changing connections that memories are stored, habits learned and personalities shaped, by reinforcing certain patterns of brain activity, and losing others. The pattern and strength of the connections is constantly changing and no two brains are alike. Our brains form a million new connections for every second of our lives. Each neuron can make contact with thousands or even tens of thousands of others, via tiny structures called synapses. The complexity of the connectivity between these cells is mind-boggling. This jelly-like mass of tissue, weighing in at around 1.4 kilograms, contains a staggering one hundred billion nerve cells, or neurons. It produces our every thought, action, memory, feeling and experience of the world. The brain is the most complex organ in the human body. (Image: Mehau Kulyk / Science Photo Library) A false-colour Magnetic Resonance Image (MRI) of a mid-sagittal section through the head of a normal 42 year-old woman, showing structures of the brain, spine and facial tissues
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