“biological variables refer to the characteristics of the body and brain that serve to motivate behavior” (p. 8). Physiological needs include oxygen, food, water, sex, sleep, and physical stimulation. It also includes the need to avoid harm, toxic stimuli, heat, and cold. For example, a person is driven to eat by hunger in order to satisfy their body’s physiological need for sustenance. As a general rule, when the feelings of hunger increase, coincidentally the motivation to eat will also increase…
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