Outlines a variety of brain gender differences in a 4-part table: portion of brain, function, similarities and differences, and impact (e.g., Corpus callosum is larger in females and helps females 2 oordinate two hemispheres more efficiently). (Gurian, Michael, PhD, and Patricia Henley, with Terry Trueman. Boys and Girls Learn Differently! CA: Jossey-Bass, 2001, pp 20-26)

Female brain has up to 30% more connections. Estrogen prompts nerve cells to grow more connections within the female brain and between the hemispheres. Males have fewer connecting fibers in the corpus callosum. (Pease, Barbara and Allan. Why Men Don’t Listen and Women Can’t Read Maps. NY: Broadway Books, 1998. p 50-53)

Differences involve the Corpus callosum, the bridge of nerves that connect the cerebral hemispheres. In males it is less dense (beginning in utero) and tends to shrink with age. In females the corpus callosum is left intact (during gestation) and does not shrink with age. (Greenwood-Robinson, Maggie, PhD. 20/20 Thinking. NY: Avery, Putnam Special Markets, 2003. p 251-252)
At least one section of the corpus callosum (near the rear) is thicker in the female brain, which allows females to use both sides of the cortex for speech. The bridge is more evenly cylindrical in males. (Fisher, Helen, PhD. The First Sex. NY: Random House, 1999. p 11-15, 60)

The corpus callosum in the male brain is about 10% thinner and carries about 30% fewer connections as compared to the female brain. (Pease, Barbara and Allan. Why Men Don’t Have a Clue and Women Always Need More Shoes. NY: Broadway Books, 2004. p 127-130)

The corpus callosum differs in the female brain. Studies: greater number of nerve fibers; larger spenium section; larger anterior commissure; larger massa intermedia that connects the two sides of the thalamus. (Baron-Cohen, Simon, Dr. The Essential Difference: The Truth About the Male and Female Brain. NY: Basic Books, 2003. p 107-109)

A much larger corpus callosum in the female brain can enable women to more easily reconcile conflicting interpretations sometimes offered by each hemisphere. (Johnson, Steven. Mind Wide Open. NY: Scribner, 2004. p 36-38)

The corpus callosum is wider and larger in the female brain as compared to the male brain. (Durden-Smith, Jo, and Diane deSimone. Sex and the Brain. NY: Arbor House Publishing, 1983. p 62-64)
Refer to Cerebral Hemispheres (Brain Function) for additional information.

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