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Flashcards in 11.17 Notes Deck (8):
1

What percentage of the world is left-handed?

1%

2

What percentage of the world are inconsistently handed?

9%

3

Non-right-handers

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

4

What percentage of individuals who have an immediate family member who is left-handed?

35%

5

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

6

Stanley Coren

Argued that prenatal trauma is responsible for handedness; brain damage to the left hemisphere is more common in non-right-handers

7

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

8

What percentage of the world is right-handed?

90%