The biological level of analysis states that physiological factors have influence over cognitive, emotional, and behavioral instincts. One of the principles that help to define the biological level of analysis is that certain behavior patterns are hereditary. The Minnesota Twin Study (Bouchard et al., 1990) demonstrates the role of genetics in behavior.
The Minnesota Twin Study is a correlational study which seeks to establish the relationship between genetics and/or environment on personality. The study uses twins as a basis due to shared genetic material. The two types of twins, who were separated at birth and raised in different environments, are the (adult) participants; the data accumulated from these twins was compared to the control
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
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.
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.
In the summary and selected experts from “Sources of Human Psychological Differences: The Minnesota Study of Twins Reared Apart” (Bouchard, Lykken, McGue, Segal and Tellegen) there were various research methods used in the study. The study focused on whether nature or nurture had an affect on twins behavior. To start, I believe this study was a cross-selection research where analyzation takes place at a single point in time rather than longitudinal research where research is collected over time.The reason for this is because it would be extremely difficult and time consuming to keep a close eye on over 200 children throughout their lifetime. This would also cause in affect if the study method would have been just plain observation
The biological perspective also can be called Biopsychological Perspective, is a large scientific perspective that undertake that human behaviour and thought processes have a biological fundamental points. Investigations with biological perspective into biochemistry of behaviour link with genetics and heritability, neurotransmitters and hormones, and the psychophysics of sensation and perception. Parts of biological perspective may include; Physiological psychology, neuroscience, pyschoneuroimunology and psychopharmacology. The biological perspective relies on scientific methods because of this, its scope of information is limited to variable that can be manipulated.
In this study, they are used several type of method, one of the technique is used two or more test instrument to ensure the adequate coverage, for example the participants were given a battery of personality and mental ability tests, interest and value inventories and psychomotor tests. In addition, separate of examiners administer the IQ test, life history interview, psychiatric interview and sexual life history interview. The twin also complete questionnaire independently under the constant supervision of the staff members. Twin studies are valuable to researchers because identical twins share 100% of their genes and fraternal twins share, on average, 50% of their genes. Both identical and fraternal twins share certain aspects of their environment (e.g. religious practices in the home). This allows researchers to estimate the heritability of certain traits. Participants are asked about academic ability, personality, and interests; family and social relationships; mental and physical health; physiological measurements. Of interest to researchers are prevalence of psychopathology, substance
This essay will outline and compare both biological and behavioural perspectives on human behaviour. The history, major discoveries and theories will be discussed along with some of the most influential theorists in each of these two areas of psychology. This essay will also compare the two areas strengths and weaknesses in the field of psychology.
(P1)The biological approach means that our behavior is the cause of biological factors. This approach looks at our genetics to construct a reason why we act the way we do and why we develop abnormal behaviors. The brain and nervous system are the biological approach and so are chemical changes in the body .This can mean chemical reactions in the brain. For instance, in eating disorders - twin studies were carried out and it was shown that if one identical twin suffered from an eating disorder then the other twin would also be more likely to suffer from a disorder as well. This did not happen with non-identical twins, suggesting that the
Biological Level of Analysis (BLOA) deals with biological adaptations at a biological level. BLOA states that cognitions, emotions and behaviours have a physiological basis to all of them. There are 3 main principles that revolve and outline the BLOA. Foremost, Behaviour is innate, as it is genetically based, so it rational to conclude that behaviour is genetically influenced by evolution. Secondly, Animal research may inform our understanding of human behaviour, as to why a lot of research is done on animals. Lastly, Cognitions, emotions and behaviours are products of than anatomy and physiology of our nervous and endocrine
The biological approach states that “all thoughts, feeling & behavior ultimately have a biological cause” (Simply Psychology). This approach says that we are affected by biological factors. Biological factors are “anything which affects the function and behavior of a living organism. Internally, this factor can be a physical, physiological, chemical, neurological, or genetic condition
First we will look into the biological aspect of human behavior. Biological pertains to one’s body chemistry and from a psychological standpoint the chemistry of the brain. No two people have exactly the
The Minnesota Twin Registry started in 1983 and its goal was to establish a registry of all twins born in Minnesota from 1936 to 1955 to be used for psychological research.., T.J. Bouchard, working in conjunction with the University of Minnesota, started exploring the similarities and differences in characteristics like personality, career interests, and a variety of personal interests between identical twins who were reared apart. Research was conducted on twins from all over the world. The Minnesota Twin study gave scientists a new insight of the role of nature vs. nurture on human development and personality; it was the hope that twin studies would be able to tie genes to specific behaviors. From the study, we understand that twins who were separated at birth and raised in different families
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
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.
Some psychological models assert that a proportion of our personality is inborn and permanent (Hollander, 1971), that a psychological core at the center of our personality gives us enduring, inner characteristics. Hans Eysenck (1965) suggests that our motivation and emotion are related to biological differences in brain function and proposed that 75% of our personality is based on genetic influence and 25% on environmental influence. Research by Peter Whybrow (1999) on identical twins separated at birth examined how their different environments shaped their personalities. He found that around 40% of personality should be credited to genetics, with 60% determined by outside factors.