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PSYC 100 Chapter Notes -Medial Forebrain Bundle, Arcuate Nucleus, Basal Ganglia

Course Code
PSYC 100
Ingrid Johnsrude

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The “why’s” of behaviour
The desires, needs, and interests that arouse and activate an
organism to move towards a specific goal
Affects nature, strength and persistence of an individuals
o Motivational states
o Drives
Eg. Eating, sexual behaviour, aggression
Intrinsic motivation
o Motives that result from an internal need
Extrinsic motivation
o Motives that based on gaining a reward or avoiding an
unpleasant consequence
Theories of Motivation
o Focuses on biological drives that seem to control and
direct behaviour
o Unlearned and universal in species
Eg. Hunting, rivalry, cleanliness, curiosity, fear
Clark Hull’s Drive Theory of Motivation
o Suggested that motivated behaviour resulted from an
internal drive
A tension or arousal that results from an
unmet need
Just a response to some need
Drive fuels behaviour
o Scientific advantage
One can manipulate needs and measure level of
Eg. Making an organism hungry increases
arousal and therefore increases motivation
o Homwostasis
Organisms have needs
Needs lead to drives
Motivated bejaviour is a form of drive reduction
Homeostasis brings equilibrium
Our bodies try to maintain a balanced state
o Problems?
Some external behaviours can override apparent
homeostatic mechanisms
Eg. Doing anything for money
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