5 types of sounds make people afraid

The sound of nail clippings on the blackboard is one of the five sounds that make the listener the most annoying. A new study has discovered an interaction between the auditory cortex and the amygdala to find a mechanism to explain this phenomenon. The study was conducted by Newcastle University and Wellcome Trust.

New research indicates that the amygdala may play a direct regulatory role in the auditory cortex in response to irritating sounds. The auditory cortex is responsible for handling sound stimuli and amygdala - almond-shaped lymph nodes - responsible for handling emotions.

The almonds play an important and unchanging role in our daily lives. It creates memories of the causes of emotions, an important factor that helps us know what is interesting and what to expect and what is bothersome and dangerous to avoid (eg, beasts, worms toxic food). If there are no amygdala, people still feel ashamed to remember that some embarrassment has happened but cannot remember the whole story.

A small survey of more than 13 people showed that there are 5 types of sounds that participants find very uncomfortable, including: The sound of a glass knife collision; The sound of a fork hitting the glass; The sound of chalk on the blackboard; The sound of knocking on glass bottles; The sound of fingernails clinging to the blackboard.

From this survey, it can be concluded that people tend to hate glasses and blackboards.

Interestingly, all unpleasant sounds are between 2000 and 5000 hertz (a unit of sound intensity measurement). Human screams are also within this range. Children's cries are often referred to as examples of one of the most annoying sounds.