Lecture33 - BioNB 2210: Lecture 33 Nov. 11, 2011 Lecture...

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BioNB 2210: Lecture 33 Nov. 11, 2011 Lecture 33: Hormones and Behavior 2 Organizational Effects Professor Mike Webster Learning Objectives 1. Describe how effects of hormones early in life can lead to behavioral differences between the sexes later in life. 2. Explain the difference between activational and organizational effects of hormones. 3. Explain how prenatal exposure to “foreign” hormones might alter behavioral development. I. What leads to sex specific behavior? A. Is it simply a matter of different levels of circulating hormones? (e.g., higher T in males triggers male-typical behavior, low levels lead to female typical behavior). B. Test – Classic experiments by William Young in the 1950’s. 1. During copulation, male rodents exhibit mounting (male typical behavior) whereas females exhibit lordosis (female typical behavior). 2. Experimental test in adult males: remove gonads (source of T) and male won’t mount normally; replace T (after removal of testes) and male will mount normally. Interpretation: T activates mounting in adult males. 3. Experimental test in adult females: remove gonads and implant with T, females do not mount. Interpretation: T does not activate mounting in adult females. 4.
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This note was uploaded on 08/27/2011 for the course BIONB 2210 taught by Professor Seeley during the Fall '10 term at Cornell University (Engineering School).

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Lecture33 - BioNB 2210: Lecture 33 Nov. 11, 2011 Lecture...

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