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Vacations, gamble, take unnecessary risks, play, and so forth. Why do we do what

we do? This is the great question associated with the subject of motivation.

The word motivation is related to words such as motor, motion, and emotion. All of these words imply some form of activity, some kind of movement. And this is one of the principal features of life—a kind of restless movement that appears to arise from sources within the organism. These sources are called motives.

A motive is a state of physiological or psychological arousal that is assumed to

play a causal role in behavior. Physiological arousal refers to such states as hunger

and thirst. Psychological arousal refers to motives such as the need for achievement.

The two factors, physiological and psychological, of course interact. For

example, a biological drive such as sex tends to interact with a psychological

motive such as the need to be loved.

It is important to note that from the point of view of psychology as a science, a

motive is an intervening variable. An intervening variable is a variable used to

explain behavior. It is assumed to reside within the organism and “intervene”

between stimulus and response. An intervening variable can’t be seen or otherwise

directly observed. It is inferred from studying behavior. If we see someone buying a

sandwich in a snack bar, we may infer that the individual is hungry. However, he or

she may in fact be buying the sandwich for a friend. The important point is that when

we act as investigators of the behavior of others, we do not experience their motives.

Biological Drives: The Need for Food and Water

We would not do anything at all if we were not alive. That is why in some sense it

can be argued that the root cause of all behavior can be traced to a group of biological

drives. Biological drives are inborn drives, and their principal feature is that

they impel us to attend to our tissue needs, to maintain ourselves as organisms. The

basic theme associated with biological drives is survival.We would die fairly quickly

If we did not follow the dictates of our biological drives on a fairly regular basis.

The biological drives are familiar. The following are frequently specified:

hunger, thirst, sleep, temperature, oxygen hunger, pain, and sex. Note that if the

word hunger appears without an adjective in front of it, then the word refers to the

hunger for food. Also note how any of the biological drives can act as a motive.

For example, if your temperature level is such that you feel cold, you might be

motivated to put a coat on.

Most of the drives direct us toward a stimulus. We seek food if we are hungry.

We seek water if we are thirsty. Pain is unlike the other drives in this particular

regard. Pain directs us away from a stimulus. It motivates us to escape from the

source of the pain.

Sex also has a unique status among the biological drives. The general theme

of the biological drives, as already noted, is survival. Usually we think of this as

the survival of the individual. However, in the case of sex, survival is generalized

beyond the individual. The long-run purpose of sex is to assure the survival of

the species.

An important physiological process associated with the biological drives is

homeostasis. Homeostasis is a physiological process characterized by a tendency

for biological drives to maintain themselves at optimal levels of arousal. The term

homeostasis was introduced in the 1920s by the physiologist Walter B. Cannon, and