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Lecture 10

PSY100Y5 Lecture Notes - Lecture 10: Sexual Orientation, Libido, Homeostasis

Course Code
Dax Urbszat

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January 7th, 2019
Motivation and Emotion
Motivation refers to the moving force that energizes behaviour (desire to do something)
Motives are the needs, wants, interests, and desired that propel people in certain
Drive Theories
Seeking homeostasis
o A drive is a negative state of tension that motivates us to engage in activities
that reduce this tension
o Disruptions of preferred equilibrium
Incentive Theories
Regulations by external stimuli
An incentive is a desire of reinforcement that has the capacity to motivate behaviour
Evolutionary Theories
Maximization of reproduction
o Aggression and sex drives
o Need to belong
Hunger Motivation
Biological (Internal)
o Neural circuits passing through the hypothalamus to regulate hunger
o The stomach can send a variety of signals to the brain to signal satiety
Environmental (External)
o it’s not all about internal hunger
o what about if the food is super good? What if there’s a lot of it? What about
greater variety?
o Presence of others
o Stress causes 50% of us to eat less, and 50% to eat more!
Sexual Motivation
Sexual desire (libido) is influenced by genes, biology,
social and cultural factors
Neurotransmitters serotonin and dopamine appear
to play a role
Human Sexual Response (Masters and Johnston)
Sexual response cycle contains four phases
o Excitement phase
o Plateau phase
o Orgasm (climax) phase
o Resolution phase
Sexual Orientation
Sexual orientation is the direction of attraction for a sexual
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