This indicated activity in the emotional region of the brain. Non-psychopathic offenders showed pupillary response to both positive and negative stimuli. Following this, they were shown positive images, such as puppies or people laughing. They measured the pupillary responses of psychopathic and non-psychopathic offenders.Īll offenders were shown disturbing images, like threatening dogs or mutilated bodies. Researchers at Cardiff and Swansea University tested this theory. So, it makes sense that emotional pupillary response looks different in a psychopath. One of the key traits of psychopathy is a lack of emotion, or callousness. Studies on pupillary response in psychopaths This supports the idea that our pupillary function is linked to our emotions. Results showed that participants’ pupil size was significantly larger during the emotional sounds. Participants had their pupil sizes monitored for the duration of the experiment. The sounds portrayed positive emotions (laughter) and negative emotions (crying baby). The participants then listened to emotionally charged sounds. One study had participants listen to emotionally neutral sounds, like office noise. This may occur while we’re experiencing our own emotions as well as when we’re empathizing with someone else’s. Pupil dilation also occurs when there’s activity in the part of our brain that helps us feel emotion. During this time, your pupils are dilated. Increased mental effort may mean something like memorizing new information. Pupil dilation is linked to increased mental effort. This function helps balance the amount of light entering the eye and produce the clearest image.īut pupils dilate and constrict during certain brain functions as well. One of the functions of the pupils is to constrict in bright conditions and dilate in dim conditions. Especially in pupillary function and eye contact. Various studies analyzing eye behaviors found differences between psychopaths and non-psychopaths. So, wouldn’t eye behaviors also be different? And the brain is closely connected to the eyes. After all, psychopathic brains don’t function the same as non-psychopathic brains. This same research has been done to analyze the eye behavior of psychopaths. And maintaining eye contact during conversation means you’re listening and invested in what the other person is saying. Psychologists and communication experts have studied these behaviors and what messages they send.įor example, in many cultures eye rolling communicates contempt or disrespect. SEE RELATED: How depression affects vision Eye behaviors of psychopathsĮye behaviors include blinking frequency, eye rolling and more. And often, having several traits can lead to crime and other types of deviant behavior.Īdditionally, some research suggests that psychopaths can experience and display certain eye behaviors. If a person is evaluated and found to have several traits from the PCL or PCL-R criteria, they may be deemed a psychopath. Some of these characteristics include:īehavior problems that occur early in lifeįeeling bored, frustrated or angry easilyįailure to accept the consequences of his or her own actions These traits are reviewed to determine if psychopathy is present in an individual. The checklists also include roughly 20 specific traits. The revised checklist is used for research purposes in psychopathy.īoth checklists include scales for items such as antisocial behavior and emotional detachment. And it has been updated as the Psychopathy Checklist - Revised (PCL-R). It has since been used as reference in clinical settings. Hare’s checklist became popular for use in criminal psychology. In 1980, Canadian psychologist Robert Hare developed the Hare Psychopathy Checklist (PCL). Many psychopaths gravitate to careers in law, journalism, media and more. Note: Not all serial killers are psychopaths. A psychopath is a person who experiences psychopathy and acts on their desires. Psychopathy is a mental disorder that affects both neurologic and psychiatric factors in a person. What follows is a clinical definition of psychopath, as well as some related eye behaviors. But the truth behind psychopathic behavior is more than meets the eye. As a result, “psychopath” encompasses a number of societal stereotypes. Psychopaths have long been portrayed in the media.
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