Chloe's 3-year-old son, Dave, is very excited about his first day at playschool. He leaves home in a happy mood and enjoys the 20-minute drive to school. At the school, he starts crying when he sees all the other children around him crying. This scenario best illustrates

Behavioural contagion.

Explanation:

This is seen to a behavioural or social influence. This is said to give someone the tenacity to copy a behaviour of someone or things that is been vividly seen to be happening in your environment. It is said to be pushed by various factors but reduction of restraint is the predominant factor according to research has been put first of all other factors. This act is sometimes tagged to be spontaneous when it happens by the said individual performing it and sometimes said to imitational. That was why Dave in the above scenario started crying when he saw his fellow mates at a crying state when their parent try to leave the play school.

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.