Major Movements in Psychology - Sociobiology and Evolutionary Psychology

13 important questions on Major Movements in Psychology - Sociobiology and Evolutionary Psychology

Who is Edward O. Wilson?

Edward O. Wilson (1929-) is considered the father of sociobiology. A professor of entomology in the Harvard biology department since 1956, he has maintained a lifelong interest in the social behavior of animals.

His original speciality was the social life of ants. Wilson's great contribution was to state that the evolutionary explanation of animal behavior could be applied to the study of human behavior. He did not mean that culture and environment had no influence, only that our behavioral repertoire has its origins in our genetics and has been shaped by the processes of natural selection.

How is Darwinian evolution relevant to psychology?

Darwinian evolution is the central explanatory framework for all of biology. All of biological science is understood within the context of evolution. Human beings are biological animals and our behavior is inextricably tied to our biology. Thus a clear understanding of evolutionary principles is critical to the understanding of human psychology.

If our behavior is genetically determined, where does learning come in?

Genetics determine the range of possible behaviors, the parameters of our behavior. Much of our behavior, however, simply cannot develop without extensive training.

For example, with the proper circumstances our genetic make-up allows us to learn to read. In contrast, no amount of training will ever lead a cat, a dog, or a pigeon to read. Likewise, no amount of training will ever allow a human being to fly.

Thus genetics determine the potentiality of our behavior but genetics alone cannot determine the specific outcomes of any given individual.
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How is reproductive success relevant to evolution?

Evolution occurs through the process of reproductive success. Those organisms that pass their genes onto the next generation have succeeded; their genes and the traits associated with them have survived into the next generation.

In evolution, success really means survival. If a trait is common in a population, this means that the genes of previous generations with that trait have survived to the present.

What does evolutionary fitness mean?

Evolutionary fitness is the ability to pass on one's genes to the next generation.

If there is a larger proportion of gene A in the present generation than in the previous one, then the organism with gene A has demonstrated evolutionary fitness.

Conversely, if the proportion of gene B has decreased across generations, then the organism with gene B has poor fitness.

How does evolution affect behavior?

We generally assume that animal behavior is adaptive, that it has evolved because it confers fitness on the organism whose genetic make-up produces the behavior.

What does survival of the fittest mean?

Survival of the fittest means that those individuals of a species with genetic traits that are best adapted to the particular environment are most likely to mate and pass those traits on to the next generation.

What is LaMarckian evolution?

Jean-Baptiste LaMarck (1744-1829) was a French biologist who contributed to pre-Darwinian theories of evolution.

In keeping with the ideas of Charles Darwin's grandfather, Erasmus Darwin, LaMarck believed in the inheritance of acquired characteristics. In other words, an animals adapts to the environment and these changes are then passed onto the animal's offspring via some form of heritability.

Although LaMarckian evolution has a kind of intuitive appeal, there has never been any evidence to support its central promise, that acquired behavior is directly coded into the genes.

How do evolutionary theorists understand altruism?

Altruism, which involves helping others at some cost to the self, has long been a puzzle to evolutionary theorists.

Although altruistic behavior may cost the individual animal, it may still confer reproductive success if it helps other animals that share the same genes. Thus, we could expect altruistic behavior to be most common among close relatives, which is universally the case.

What is also found is that the cost and risk of altruistic behavior decreases as the biological relationship grows more distant.

Do females compete for males?

Female-to-female competition certainly exists. Some female birds roll other females' eggs out of the nest or otherwise interfere with their reproduction. In complex social groups, females can compete for status.

When males are monogamous, they are likely to be more selective in their choice of a mate as they invest more in each partner. Hence females may need to compete for males. In these cases, females who show signs of greater reproductive fitness are often more successful in attracting males.

What are the controversies of sociobiology?

Sociobiology was extremely controversial in its early days in the 1970s and 1980s. To say that a behavior had a genetic base seemed to imply that it was morally desirable or inevitable. Further, the emphasis on genetics was seen to invalidate the importance of environment.

The biggest problem with evolutionary explanations of human behavior, however, involves the profound difficulty distinguishing between proximate and ultimate levels of causation.

What is the difference between proximate and ultimate causation?

The ultimate level of causation refers to the behavior's evolutionary significance; how the behavior enhances reproductive fitness.

The proximate cause refers to the immediate cause of a behavior, whether that be hormonal, neurological, cognitive, interpersonal, or cultural.

How do scientists test the evolutionary significance of behavior?

Sociobiology relies on careful animal studies in which the frequency of any given behavior can be correlated with some marker of evolutionary significance.

In humans, twin studies have been used to differentiate the effects of genetics from the effect of environment.

Additionally, anthropological studies that compare social behavior across different cultures are also used in an attempt to seperate the effect of genetics and environment. These studies become harder to do with time, however, as globalization leaves fewer cultures truly independent of each other.

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