Flashcards in 11.17 Notes Deck (8):
What percentage of the world is left-handed?
What percentage of the world are inconsistently handed?
Larger corpus callosum: possibly more myelination and more inter-hemisphere connections; greater symmetry between the two hemispheres: bilateral representation of cortical functions; have better episodic memories; Overrepresented in populations who are mentally retarded, schizophrenic, alcoholics, criminals, the mathematically gifted, and the artistic
What percentage of individuals who have an immediate family member who is left-handed?
Geschwind and Galaburda Theory
Argued that testosterone was responsible for handedness; either there was an increased sensitivity to testosterone or too much testosterone in the womb; Would speed up the development of the right hemisphere; testosterone impacts the development of the thyroid, immune response, increased autoimmune disorders in the non-right-handers
Argued that prenatal trauma is responsible for handedness; brain damage to the left hemisphere is more common in non-right-handers
Gender differences in neurology
Males: have bigger brains and right hemispheres, and are better at spatial tasks; Females: language centers in the left hemisphere are bigger, greater connectivity between hemispheres, bilateral representation of some cortical functions, Similar to non-right-handers in brains, larger vocabulary