What are the instinctual roots of sexual behaviour
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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
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


What are the general characteristics of fap s
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


Energy

input

Valve =

“innate releasing mechanism”

Fixed action pattern (FAP)

Weights = sign stimulus

A Hydraulic Model of Ethology (“Lorenz’s toilet”)


What are the fixed action patterns faps in the sex life of the three spined stickleback
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:


What are the four standard ethological issues about any fap
What are the four standard ethological issues about any FAP? the three-spined stickleback?

1. Immediate cause (sign stimulus)

2. Ontogeny

3. Function

4. Phylogeny


What are the sexually relevant mechanisms in the hypothalamus
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.


Prenatal factors what is the role of testosterone
Prenatal factors: what is the role of testosterone? hypothalamus?

1. Manipulating the presence or absence of testosterone.

2. Manipulating stress in pregnant rats.


Sexual orientation
Sexual orientation: hypothalamus?

Social and family factors: Bell (1981)

Biological factors: LeVay (1991,1992)


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