The Upstairs & Downstairs Brain

Advances in neurosciences continue to inform our understanding of what makes us human, and perhaps even more importantly, how we interact with each other. In this week’s post I recommend two excellent speakers and experts in the field of neuroscience to you, Dan Siegel and Sarah-Jayne Blakemore.

We have passed through many periods of popular assumptions about the brain and the mind, including the tabula rasa (blank slate) theory that humans are born void of knowledge and acquire ideas and wisdom over time from the world in which they operate. And, until a few years ago, we believed that the wiring of our brains was pretty much determined and complete within the first few years of life. Advances in techniques for studying the brain, in recent years, have shown that development continues well into adolescence (and beyond), particularly in the pre-frontal cortex.  During this period of development an especially important process takes place. Synaptic pruning. Underused synapses and connections in the brain are pruned, just like weak or dead branches on a rose bush are cut away.  This is a vital phase of development of the brain, during which connections that are used are strengthened and those which are not are lost. Neurons that fire together wire together. (See also previous post on this subject: The “white stuff”, and what it means for your brain – March 2012) Continue reading

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