The ability to understand language and produce speech is coordinated by the brain. So a person with brain damage from an accident, stroke, or birth defect may have speech and language problems. Genetics may also play a role In some speech problems. Articulation disorders is for example confusing or substituting the W and the R like many “campaniles” here in Colombia, it also includes adding sounds to words, and omitting sounds. Finally, the last disease is lisping, which refers to specific substitution involving the letters S ND Z. A person with lisping replaces the S and Z sounds with HTH.
On the other hand, many people cannot speak in public, but this is for personal reasons. Millions of people around the world suffer from stage fright or performance anxiety. Performance anxiety prevents you from explaining thoughts and expressing emotion. Performance anxiety can affect you mentally in the long term since it can affect your self-esteem and confidence in a negative way. The reaction of stage fright is very common on the human body and it serves many different purposes. When you are being watched by hundreds of people you will feel stress.
When you are in stress your body releases little dosage of adrenaline, which causes you to panic. This system is a very well known defense of the body when it is in danger. The mechanism used is called fight or flight. There are many different types of stage fright. When you are feeling stressed on stage you can develop symptoms such as rapid breathing dry mouth, shaking hands, voice cracks, and in some cases it can make you dizzy. These symptoms prevent you from thinking straight aging your exposition or presentation level or grade go down.
There is many ways to overcome this problem, which affects many people around the world. Many people believe that stage fright is lack of confidence, so what you should do to avoid it is to redirect your negative thoughts and think about how your audience is going to enjoy your presentation. It is recommended to people that suffer from stage fright to avoid caffeine since caffeine will rise energy levels making you more anxious. People who have overcome their fear say that the key of speaking in public is just to be yourself.