Q.Distinguish between biological motives and psychosocial motives, giving at least two examples of each. Are these two types of motives ever completely independent of each other? Explain.

Psychologists broadly classify human motives into two categories: biological (or physiological) motives and psychosocial motives. Biological motives are guided mainly by the physiological mechanisms of the body; they are rooted in internal bodily processes and are essential to the sustenance of the individual (or, in the case of sex, the species). Hunger, thirst and sex are the classic examples. Hunger, for instance, is triggered by internal signals such as stomach contractions, low blood glucose and liver signals, coordinated by a feeding-satiety system centred on the hypothalamus, along with external cues like the smell of food. Thirst is triggered by loss of water from body cells and reduced blood volume, detected by osmoreceptors in the anterior hypothalamus. Sex, though a powerful biological drive, is regulated in humans by both physiological and, very strongly, psychological/social factors, making it something of a borderline case even among biological motives.

Psychosocial motives, by contrast, are mostly learned or acquired through an individual's ongoing interaction with their social environment — family, neighbourhood, friends and relatives all contribute to shaping them. The need for affiliation (the motivation to seek closeness with others, physically and psychologically) and the need for achievement (n-Ach, the desire to meet standards of excellence, associated with a preference for moderately challenging tasks and a strong desire for feedback) are two classic examples; the need for power (the motivation to influence or produce effects on others' behaviour and emotions) and curiosity/exploration (the tendency to seek novel experience without any specific identifiable goal) are two further examples.

The key structural difference between the two types is therefore their origin: biological motives arise from internal physiological imbalances (needs) within the body, while psychosocial motives arise mainly from a person's interaction with, and learning from, their social world.

However, the chapter is explicit that these two types of motives are never completely independent of one another — no motive is absolutely, purely biological or purely psychosocial. In practice, both types of motives are interdependent: in some situations, a biological factor may trigger what looks like a social motive (for instance, physical discomfort or vulnerability can heighten the need for affiliation, since people often seek company when they feel threatened or helpless), while in other situations, psychosocial factors clearly shape the expression of what looks like a purely biological motive (for instance, religious fasting or family meal customs can delay or restructure how the biological hunger drive is actually expressed, and the sex motive, though biological at its root, is heavily shaped by psychological and social conditioning in humans). Because of this constant interaction, motives should be understood as existing on a spectrum, aroused in each individual through varying combinations of biological and psychosocial factors, rather than as belonging neatly and permanently to one category or the other.