What happens when you lie? Do you start to sweat or get a little nervous? Does your heart begin to beat a little faster? Lying is the act of being deceptive or untruthful. It has become apart of everyday life for most people, with the average person telling at least one lie a day. But few people know what happens inside their body when they lie and how that reaction relates to chemistry.
I chose to do my project on the Chemistry of Lying because lying is something that humans encounter on a daily basis. I wanted to know what happened inside the body when you lie and what causes your heart to beat faster or that nervous feeling in your stomach. Through my research, I also hoped to understand what drives people to lie so frequently. It was an interesting and rather abstract topic that I had not thought much about in the past.
With deception occurring in thirty percent of one-on-one conversations a person has in a week, it is easy to see how lying affects most people's lives. For me personally, one of my biggest pet peeves is being lied to. Lying is not something that can be avoided easily but knowing more about the hows and whys of lying will hopefully help us to understand we are so prone to deceiving one another.
Composition of ...
Main Chemicals, Compounds, Components
The two main components of lying are the catecholamines, epinephrine and norepinephrine.Epinephrine, C9H13NO3, otherwise known as adrenaline, is the hormone responsible for the reactions that happen to body when a person becomes stressed. These reactions include increased heart-rate, muscle tenseness, increased blood pressure and respiration, and vasoconstriction. Epinephrine essentially prepares the body for stressful or harmful situations. It is produced by the adrenal medulla using the two amino acids phenylalanine,C6H5CH2CH(NH2)COOH, and tyrosine, C9H11NO3. First dopamine is produced which is then converted into norepinephrine and then into epinephrine through a series of reactions. It is then stored in the chromaffine cells of the adrenal medulla. Epinephrine is released into the bloodstream when the sympathetic nervous system is stimulated by something that causes a person to feel stressed. The adrenocorticotropin hormone is also used in the process of stimulating the adrenal gland to release epinephrine. Adrenaline or epinephrine is produced in the body because it is an important part of the body’s ability to survive. It can save someone’s life even in the most stressful of situations. Although lying usually is not life-threatening, epinephrine is the force behind the telltale symptoms of lying like sweating and elevated heart-rate.
Norepinephrine, C8H11NO3, is another “fight or flight” hormone that is released when the body undergoes stress. It is also produced in the adrenal medulla and is created in the same way that epinephrine is, through the transition of amino acids into hormones. Once norepinephrine is produced, it is then stored in the synaptic vesicles until stimulated to release. This release occurs when the body begins to feel stressed and is done so to prepare the body for a harmful situation by providing protection to key organs and functions of the body. When this hormone is released, it binds to adrenergic receptors in order to carry out its many duties. Norepinephrine triggers the releases of glucose into the bloodstream and causes an increase in: blood pressure, heart-rate, mental awareness, and respiratory rate. It also acts as an anti-inflammatory of the brain and draws blood away from some organs to prepare the body for the situation it faces.
Lying is a very common occurrence in our everyday lives, and so naturally we as humans seek to know the truth. There are very few known ways of detecting whether someone is lying, and one of those ways is through the use of polygraph testing. A polygraph measures the reactions that come from your sympathetic nervous system like blood pressure and pulse. This system works based on the belief that your body undergoes stress and anxiety when you lie, which would result in the release of epinephrine and norepinephrine. Polygraphs tests are not often considered a reliable source of lie detection because there are ways for people to outsmart the machine and control their nerves while lying. This would be the reasoning behind why polygraph testing is not frequently used in a court of law.
Limbic system is the center of the brain that controls anxiety and triggers the subconscious reactions that happen when someone lies
Different parts of the brain are activated when you lie, which may not be used when telling the truth
This source presents many statistics and facts, as well as explaining the gestures that our bodies due when we lie
pathologic liars have more white matter in their prefrontal lobes-could mean that this gives these people the tools to be more deceitful
moral decisions are made using the prefrontal lobe
gray matter- more awareness of morality, white matter- tool to ignore morality
rather inconclusive study but good start in the study of gray vs white matter
various facts about lying
video discussing the tell tale signs that someone is lying
what happens in the grey matter of the brain
lying stimulates 3 different sections of the brain
catecholamines are the hormones released in response to stress
catecholamines- chemical released when you lie (neurotransmitters)
when you are stressed, your body releases catecholamines (epinephrine, norepinephrine, dopamine)
these activate area in brain calle amygdala, which triggers emotional response
suppress activity in front of brain that control rational thought, concentration, and short term memory
epinephrine and norepinephrine info
composition of phenylalanine amino acid
composition of tyrosine amino acid
composition of a methyl group
About the Author