Homeostasis can be maintained as long as there are no long-term changes in the physiological factors that directly influence it. A settling point is established when there is a balance between opposing forces. These points are capable of change and are likely to do so when the opposing forces alter their balance (Berridge, 2004).

The drive reduction theory also addresses the motivational drives to maintain homeostatic regulation. In this theory, a stressor that takes the form of a homeostatic emotion disrupts the internal balance and provokes a drive state in which a motivational drive to restore balance becomes priority (LaGraize et al., 2004). The drive is the internal tension that develops that motivates the organism to act in order to reduce the state of tension. In the case of hunger, hunger induces the motivational drive to locate and consume food in order to stop the feelings of hunger, replenish nutrients...
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