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the desire is fulfilled or not, there is a sense in which the desire presents its object in a favorable light, as something that appears to be good. Besides causing actions and pleasures, desires also have various effects on the mental life. One of these effects is to frequently move the subject's attention to the object of desire, specifically to its positive features. Another effect of special interest to psychology is the tendency of desires to promote reward-based learning, for example, in the form of operant conditioning.

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