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Lecture 4

RLG202H5 Lecture Notes - Lecture 4: Mammary Gland, Fluoxetine, David Buss


Department
Religion
Course Code
RLG202H5
Professor
Raffaeli
Lecture
4

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SEX DIFFERENTIATION: BRAIN & BEHAVIOUR October 2nd , 2014
Sexual Response
Subjective sense of sexual excitement or arousal
Interaction between
Cognitive information processing
Central brain mechanisms
Peripheral physiological processes
Psychosomatic circle
Central brain mechanisms
Neural signals
Peripheral sexual responses
Excitory
inhibitory
Cognitive
Automatic
controlled
COPULATION
a sexually dimorphic behavior
Males: pelvis thrusting
Females: lordosis
•under the influence of gonadal hormones
•Has organizing and activating function
E.G.Rats
Males
•Castrated at 1 day old – no copulation
•Castrated after 1 week – will copulate with testosterone in adulthood
Females
Given organizing and activating shots of testosterone – lose capacity for lordosis; will
exhibit male copulatory behaviour
Testicular function:
relevant to sexual differentiation
Early testosterone influences neural organization underlying male copulation
Early testicular function leads to masculinization
Lack of gonadal function leads to feminization
Activating androgens at puberty for humans
Males (testosterone)
9-10 years old (shortly before puberty)
Masturbation starts
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