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What are the instinctual roots of sexual behaviour?

What are the instinctual roots of sexual behaviour?. The field of Ethology Fixed action patterns (FAPs) and sign stimuli Sexual motivation and behaviour in fish, in mammals, and in humans. Konrad Lorenz (1903-1989) Nikolaas Tinbergen (1907-1988) The concept of instinct.

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What are the instinctual roots of sexual behaviour?

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  1. What are the instinctual roots of sexual behaviour? • The field of Ethology • Fixed action patterns (FAPs) and sign stimuli • Sexual motivation and behaviour in fish, in mammals, and in humans

  2. Konrad Lorenz (1903-1989) Nikolaas Tinbergen (1907-1988) The concept of instinct

  3. What are the general characteristics of FAP’s? • stereotyped • universal (species-specific) • relatively independent of individual experience • ballistic • characterized by singleness of purpose • triggered by sign stimuli

  4. Energy input Valve = “innate releasing mechanism” Fixed action pattern (FAP) Weights = sign stimulus A Hydraulic Model of Ethology (“Lorenz’s toilet”)

  5. What are the Fixed Action Patterns (FAPs) in the sex life of the three-spined stickleback? 1. The FAP of the male’s attack behaviour towards other males. 2. The FAP of courtship behaviour of the male and female:

  6. What are the four standard ethological issues about any FAP? 1. Immediate cause (sign stimulus) 2. Ontogeny 3. Function 4. Phylogeny

  7. What are the sexually relevant mechanisms in the hypothalamus? 1. Males: the medial preoptic area, particularly the sexually dimorphic nucleus. 2. Females: the ventromedial area.

  8. Prenatal factors: what is the role of testosterone? 1. Manipulating the presence or absence of testosterone. 2. Manipulating stress in pregnant rats.

  9. Sexual orientation: Social and family factors: Bell (1981) Biological factors: LeVay (1991,1992)

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