By de la Pena J.A., Vallejo E., Atakishiyev N. (eds.)
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When the Brain Is Constructed To understand how the human brain can be both so similar yet so different among individuals, we must go back to the stages that presided over the creation and development of our brain during our mother’s pregnancy. Since 25 two MRI does not use ionizing radiation, like x-Â�rays or radioactivity, it enables not only the examination of the same person many times to observe how his or her brain is evolving through time, but above all, it enables us to examine babies, fetuses, or even embryos in the mother’s uterus to observe their brains, virtually—Â�in particular, if an anomaly that might lead to a medical intervention is suspected.
The wall of the tube manufactures a great number of neurons. During the final months of a pregnancy a simple calculation shows that the production of neurons reaches 250,000 per minute! These exceedingly numerous neurons cannot remain where they were created, and so migrate to find a precise place on the surface of the future brain, “their” place (somewhat like vacationers who look for their favorite place on the beach), a place from which they will never move again. This overall migration process, minutely orchestrated by the genetic code, includes several stages—Â�sequential in animals, and more intricate in humans.
Up to now, images have enabled us to create the archaeology of the brain, to rediscover the traces of our personal interaction with the environment from the details of its anatomy, which more or less reveals the inner workings of our personal history. It becomes possible, with MRI images, to determine which regions, through their shape or, as we will see in the next two chapters, their function, have been determined by a given gene, and to see the effects of the environment—Â�to determine the effects, in sum, of the innate and the acquired.