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The first introduction to psychology usually comes in the form of biology classes. Many biology students already come into class with at least basic understanding of psychology. They know that their genes determine how their bodies work, how they function and, to a certain degree, how they behave or what illnesses they may develop. But very few of these students have a clear understanding of what exactly DNA is, where it is found in the body, why it causes problems, and how it can be manipulated or changed.

In the case of development, the genes passed from one generation to the next only need to survive. Genes are merely instructions for doing things. People, as all living things, are programmed through thousands of years of natural selection to engage in behavior that’s survival oriented. The basis for this programming is that the expression of certain genes that cause specific traits, such as aggressiveness, violence or sexuality. In the case of psychology, the genes that are passed on to us through our parents, siblings, or other kin will determine such behavior.

In terms of understanding what is going on genetically, we are still in the age of molecular biology. In this frame, genes are simply packets of information carrying instructions. This is the way humans, plants and animals have been growing for thousands of years. However, in the last 50 years or so, a revolution in the field of psychology has happened known as molecular biology or genomics. Genomics provides a new lens through which we could see the relationships between behaviour and genes.

The molecular basis for behaviors and human memory is in fact quite simple – it is all about the epigenome. The Epigenome is a mobile memory storage which determines whether or not a behavior is going to be expressed or not. Like all memory storage systems, it contains information that is “programmed” in advance by the genome.

What we now know is that the genetic material that determines behaviour exists in all of us, but in varying amounts. Most of the variations come from the variation in the copies of genes inside the mobile memory storage of the individual. The copy of the gene that determines the behavior is called the epigome. It’s this particular copy that we call the epigenome.

The significance of the epigenome in psychology and its relationship to individual differences was shown in a landmark study on twins. For years, autism research was based upon research on twins. However, it was discovered that there was substantial heritability (hitability) to behavior which existed between people who had identical twins but whose traits were very different. This study provided the first evidence of the significance of the epigenome in human behavior and its link to abnormal behavioral disorders like autism.

Although the importance of the Epigenome in psychology was established, many in the psychological field are hesitant to accept its potential as a significant factor in mental illness. One reason for this is it is difficult to define an actual genetic sequence or locus that leads to a behavioral disorder. Another issue is that there are just too many genetic differences between people to use a single DNA sequence to determine mental illness. Finally, although the research on the Epigenome has been promising, more work needs to be done to determine the role that genetics play in complex diseases like schizophrenia. If this finding holds true, it may be utilised as a foundation for studying other complex diseases that have complicated genetic components.

If you are interested in knowing more about Epigenetics and how it applies to psychology, I strongly advise that you follow the links below. My site discusses the exciting new technologies that are available today to better understand how Epigenetics affects behavior and the susceptibility to disease. You can even hear me speak on my epigenetics and autism blog. My research into Epigenetics is centered on understanding the ecological causes of disease, but I have also been involved in studying the relationship between Epigenetics and Autism. My future articles will also talk about diseases of the brain which can be impacted by Epigenetics.