Charles Darwin's Theory Of Natural Selection

Charles Darwin’s theory of evolution puts forward a statement, ‘Survival of the fittest’. This is widely considered true, but in reality truth is a slight variation of this, more commonly known as natural selection. The survivors are the ones who adapt best to their environment and are then able to reproduce. This means that there genes carry on through the generations and we gradually see the preferred characteristics for survival become more common. Over time the human race will become more and more adapted for survival on earth and this process is called evolution. Psychologists look at the behavioural aspects of people in order to work out whether the behaviour of humans has been determined through evolution. They have done this by studying
Therefore, the study has population validity. As a result, we can apply the researcher’s findings to a large part of society. Furthermore, the study has cultural validity, because of its large sample. Therefore, it can be applied to people who are from vastly different backgrounds. Lastly, Fessler had a control group to compare results to. This was a group that contained women who were sick in their first trimester and women who were not. The fact that Fessler had a control group makes the results much more reliable. Consequently, we can say that these results are both reliable and
Therefore, we can apply this to most sectors of society. It also has cultural vailidty, because the Ps are from 165 different countries. This means that we can apply the findings to people from all over the world. Lastly, the test is not too long for it is only 20 scenarios long. This means that the P is unlikely to become de-sensitised or become too disgusted. As a result the research is much more reliable. However, this study doesn’t have ecological validity, because the Ps are looking at pictures on a screen instead of the actual object. This means that disgust may be influenced by other senses like smell and hearing. An improvement because of this may be to actually show the Ps the samples as an object in front of them. Psychologists have also looked to explain other behaviours like what foods we like. For example, as humans, most of us like to eat sweeter foods like fruit. In 1928 Davis investigated the eating behaviour of infants and young children in a paediatric unit. They did thi9s by monitoring the foods that the children chose.Davis found that have ‘an innate regulatory mechanism and are able to select a healthy diet. Furthermore, they tended to choose sweet or salty food while avoiding foods that are