In addition to influencing simple innate behaviors such as sucking reflexes and withdrawal responses, habituation is believed to be responsible for a number of more complex emotional reactions in humans. Explanations for the effects of habituation on emotions are derived primarily from the opponent process theory of motivation.
The opponent process theory holds that each emotional stimulation (or primary process) initiated by an environmental stimulus is opposed by an internal process in the organism. The emotional changes that actually occur in the organism are predicted to result from the net effect of these two processes. The opponent process detracts from the primary process, and summation of the two yields a particular emotional response. It is hypothesized that when the organism is repeatedly stimulated, the primary process is unaffected, but the opponent process is strengthened, which results in a net reduction in the overall emotional response. In other words, repeated presentation of an emotion-arousing stimulus results in habituation in the emotional response, primarily as a result of the elevated opponent response.
An increase in drug tolerance which results from repeated usage of a drug is best explained by this kind of habituation. Habitual users of alcohol, caffeine, nicotine, or various opiate derivatives must consume greater quan tities of such drugs each time they are ingested in order to achieve the same emotional stimulation. Thus, with repeated usage, there is a decline in the overall emotional response. This decline in the euphoric effects of a drug is primarily the result of an increase in the opponent process, which can be characterized as the negative effects of the drug. This is presumably why habitual users experience severe physiological problems (for example, headaches or delirium tremens) upon termination of a drug.
Similar patterns of habituation have also been suggested to explain the human emotional responses associated with love and attachment and the extreme feelings of euphoria derived from various thrill-seeking activities such as skydiving. Thus, while habituation and sensitization are simple forms of learning, they may be involved in a variety of more complex behaviors and emotions as well.
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