He was surprised when she said she liked riding roller coasters because they were scary. Mara's love of roller coasters is an example of the drive reduction theory's lack of support.
One of the most serious flaws in Hull's drive reduction theory is that it does not take into account how secondary reinforcers reduce drives. Secondary reinforcers, unlike primary drives like hunger and thirst, have no direct effect on physiological and biological needs. The Drive Reduction Theory's major flaw is its inability to explain why humans do things that put them in a stressed or unfulfilled state, and why they frequently fail under high arousal.
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