The human brain has some level of "hardwiring" at birth but much of it is unfinished. It is shaped by its life experience so takes much longer than members of the animal kingdom) as the wiring allows it to adapt to details in life around it. Two million synapses or connections are formed every second in an infant’s brain and by age two there are double the number of synapses compared to an adult brain. During the maturation process half of these synapses will be pruned based on whether they are used or not. Who you are is based on what is pruned. (Eagleman, David. The Brain, P 7-10.NY: Pantheon Books, 2015.)

The brain is the last organ of the body to become anatomically mature. Early on children are very open and imaginative. Two brain-growth stages changes this:

  1. The five-to-seven shift when emotional circuitry comes under stronger prefrontal control
  2. At puberty when the brain goes through radical sculpting

(Goleman, Daniel. The Brain and Emotional Intelligence: New Insights.p 71-73. MA: More Than Sound, 2011)

Analogy: the male brain turns on to do a task and then turns off; the female brain is always on. (Gurian, Michael. The Wonder of Boys. NY: Jeremy P. Tarcher/Putnam, 1996, pp 14-16)

Boys show earlier right hemisphere development. The hemispheres are more specialized/lateralized. Boys typically have more confidence in their math abilities. (Brynie, Faith Hickman. 101 Questions Your Brain has Asked About Itself but Couldn’t Answer Until Now. CT: Millbrook Press, 1998, p 115)

Boy’s brain is about 10% larger than a girl’s brain. Girl’s corpus callosum (connecting fibers between cerebral hemispheres) is larger than a boy’s. (Gurian, Michael. The Wonder of Boys. NY: Jeremy P. Tarcher/Putnam, 1996, pp 12-14)

Baby girls are more sensitive to touch, more responsive to light, have a keener sense of smell, are less fretful, smile more, eat less, and control their bladders/bowels earlier, and undergo different development of the nervous system. (Tanenbaum, Joe. Male & Female Realities, Understanding the Opposite Sex. NV: Robert Erdmann Publishing, 1990, pp 31, 34, 38)

Brain development is a spectrum. Mainly girls lean toward a female brain and boys toward a male brain, but some boys are at the female end and some girls at the male. There are also bi-gender brains that possess nearly equal qualities of both male and female brains. (Gurian, Michael, PhD, and Patricia Henley, with Terry Trueman. Boys and Girls Learn Differently! CA: Jossey-Bass, 2001, pp 16-17)

Girls have 10% more neurons in a specific portion of the temporal lobe, and the cells are stacked closer together in the second and sixth layers. (Brynie, Faith Hickman. 101 Questions Your Brain has Asked About Itself but Couldn’t Answer Until Now. CT: Millbrook Press, 1998, p 115)

Female brain has greater functioning in memory and sensory intake. Male brain has greater functioning in spatial tasks and abstract reasoning. (Gurian, Michael, PhD, and Patricia Henley, with Terry Trueman. Boys and Girls Learn Differently! CA: Jossey-Bass, 2001, p 30)

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