Cognative Development: Therories of Locke and Descartes

Identical twins are many times seen as genetic reproductions representing variations from twin to the other twin and are created because of environmental factors (Cervone & Pervin, 2010). Since identical twins share identical genetics, his or her personality seems to also share similarities. Moreover, the environment can impact fraternal twins, resulting in fraternal twins personalities and his or her characteristics similar to each other. For example, identical twins. Some research shows twins that are raised in the same residence have little differences from those who are raised in a different home.

Table 3-1 examines the correlations between selected characteristics for the identical twins separated at birth and the twins raised together. When compared to each other, they both have very similar brain wave activity, blood pressure and heart rate in the physiological characteristics. The Raven intelligence test was very similar, but the WAIS IQ displayed a bit of difference when compared to the other comparisons made. Personality wise, they typically had similar personalities at the same rate as twins raised together. Psychological interests were off a little bit, but still very similar. The twins that were separated at birth had less similar psychological interests compared to the twins

Parallel to this, the focus on genetics is Particularly convicted in twin studies, which establish a comparison between monozygotic twins that are identical and dizygotic twins, which are opposingly non-identical. This distinction can be identified in Torgersens study, which compared MZ and same sex DZ twins where one proband had an anxiety disorder, and it was discovered that such disorders were 5x more frequent in MZ twin pairs, who mutually shared identical genetics.

Twin studies are a mainstay of the nature verse nurture debate because they allow researchers to conduct “natural experiments” on human beings. When researchers try to determine the relative importance of genetics and environment with regard to a certain condition, they have a hard time because they cannot generally get people with the same genes. This is where twin studies come in. Twins studies are part of the method used in behaviour genetics, which includes all data that are genetically informative. E.g. siblings, adoptees, pedigree data etc. Researchers use this method to estimate the heritability of traits and to quantify the effect of a person 's shared environment (family) and unique environment (the individual events that shape a life) on a trait.

Identical twins may share the same DNA make up and grow up in the same household, yet they have very distinct personalities. On the other hand, twins that may have been separated at birth, find that years later when they meet up for the first time that they have very similar character traits and experiences. Researchers have been trying to figure out for years if DNA or environment has a bigger factor in determining a twin’s personality. When researchers try to determine how personalities are developed, they often look to twin studies to determine if DNA or life experiences are influential in personality development.

In reading stories about identical twins my point of view is easily understood. Various types of psychologist have analyzed the study of identical twins. It shows that individuals with the same genetic make-up can be totally different, when it comes to personality. Nurture promotes the twins to grow up as separate individuals. Its a lot better if a twin has his or her own personality rather than the same exact personality of the other half. I think this great debate weighs heavier on the nurture side. As a child my parents, and sibling overshadowed my genetic make-up. No matter how much I thought my physical traits made me behave. It did not affect me more than the things that I had seen and been exposed to. The more things that I had seen around and experienced made me the person that I am today. If my genetic make-up was totally different, to a certain extent, I am sure that I?d behave the same way that I do presently. There are exceptions to that. For instance if I were six foot five and one hundred and ninety pounds, I?d most likely be in the NBA and be really rich. I think if I was really rich and in the NBA I wouldn?t have the same worries that I have today. Even if before I were in the NBA I would have lots of attention and have a lot more confidence. So to an extent I would change a little if my genetic make-up were different. In a sense, genetic make-up is just a competitor to the environmental factors

Ultimately adoption is “the legal process which permanently transfers all the legal rights and responsibilities of being a parent from the child's birth parents to the adoptive parents”, (Human Services, Community Services, 2009 p. 1) so parents who are not related to the child in any form are adopting the child. In a sense, Twin studies relates to nature, as

The main focus of this study is whether nature or nurture is stronger. The researches wanted to see if twins who were separated at birth would still grow up to be similar. I believe the results will be that the twins will share some interests and similarities, like all siblings do, but because of the separation they will not be as similar as that might have been if they had been kept together. From my experience, people are born with a personality. There are certain traits that we are born with that the environment we grown up in can influence, but cannot completely change. With that said, the environment we grow up in does play a large role in the people we become and what are opinions are. As we talked about with the sociological imagination, outside influences make a huge impact on our

Socrates once said, “As for me, all I know is that I know nothing.” Several philosophers contradicted Socrates’ outlook and believed that true knowledge was in fact attainable. This epistemological view however had several stances to it, as philosophers held different beliefs in regards to the derivation of true knowledge. Rationalists believed that the mind was the source of true knowledge, while in Empiricism, true knowledge derived from the senses. Rene Descartes, a rationalist, and John Locke, an empiricist, were prime examples of epistemologists who were seen to differentiate greatly within each of their philosophies. However, although Descartes and Locke’s ideas did contrast in that sense,

Throughout history, across all cultures, people have been fascinated with twins. In addition to interest in the close emotional ties and biological similarities that twins may share, reports of special twin languages and twin extrasensory perception (ESP) help people to explore ideas of what it means to be human. How similar or different are they to each other? How important are genes and environment for development? Because identical twins share all of their genes, it is the environment—rather than genetics—that accounts for any differences between them.

Like Descartes, Locke also believed in an external world. As an empiricist, Locke relied heavily on the senses to provide true knowledge (Moore 2002). He shared Aristotle’s belief that the mind is a blank slate, also known as tabula rasa, at birth (Paquette 211). Our sense experiences thereafter provide us with knowledge to fill in those slates (Paquette 211). In Locke’s “Representative Theory of Perception,” also known as Epistemological Dualism, he stated that material objects exist and are separate entities from human beings (Paquette 227). However, he also believed that objects exist in the mind as psychological entities (Paquette 227). Locke concluded that people can taste, smell, touch, and see the external world which, in turn, becomes impressions in our minds (Paquette 227). Descartes and Locke are thus seen to be similar in the sense that they both believed in an external world.

     Locke instead is an empiricist, and therefore he directly critiques Descartes epistemic system and tries to establish his own foundation of knowledge. Locke believes that our knowledge of the world comes from what our senses tell us. Locke’s theory state that we are all born with a blank slate, tabula rasa, before we

Another study that has been done was with separated twins. Each twin was raised in a completely different environment than the other. Genetically, they were both identical in every way, but the environment that they were raised in was very different. One twin was raised in a very hostile setting and slowly became violent as an adult while the other twin was

John Locke, a British philosopher, focused on the role of social environment and experiences in education. Locke believed that children’s minds were blank slates. Meaning we are not born with any innate notions or abilities. Locke consider the mind “to be...white paper void of all characteristics, without any ideas.” (Crain 7) The mind is very pliable and ready to accept new information. Locke believed children learned in four ways, the first of which is associations. What this means is that we simultaneously think of two things and associate them. For example if you get sick after eating at McDonalds, you might feel stomach pain every time you see one. The next way is repetition, or doing something several

From these studies, researchers have found that twins who have grown up in the same household share similarities in the way they think, act, dress, speak, etcetera. However, with the first type of twin studies, researchers could not differentiate whether the similarities were due to them having identical/similar genetic makeups or growing up in the same environments. Therefore, in order for psychologists to know whether similarities in twins are genetic or socially influenced, they studied twins who grew up in completely different households and environments. The study showed that despite growing up with a different family and in a different environment, they still had noticeable similarities in fashion, interests, and thought processes (K.W. Brown, personal communication, August 29, 2017). Twin studies, as well as other studies, have greatly contributed to our understanding of overall role that genes play in the development of psychological traits and behavior.