 | environmental stimulation and changes in testosterone level, 20
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 | focus single-minded, and testosterone, 42, 4446
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 | glial cells, 65
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 | learning disabilities, 47
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 | limbic system and amygdala, 21, 121
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 | metaphors for functioning of, 2122
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 | "Need for Cognition" scores, men and women, 50
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 | spatial skills, 5158
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 | testosterone and, 10, 2021, 4172
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 | testosterone, optimal level in, 59
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 | testosterone, size of and, 6465
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 | verbal skills, 42, 47
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 | web thinking versus step thinking, 43
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