Hear it is a term that refers to the sensory faculty to achieve the perception of a sound . The concept is usually associated with the verb hear , although it mentions the fact of attending to what has been heard. In colloquial language, however, both are used as synonyms.
For example: "I couldn't hear what you said, could you repeat it?", "I will not hear more reproaches: I do what I want with my life", "After hearing the rumble, the man went outside and found his car shattered".
The faculty of hearing constitutes the meaning of hearing , formed by various physiological and psychological procedures that allow the people Hear and catch sounds. A sound , on the other hand, is a sensation that occurs in the ear from certain vibrations.
When the sound waves pass through the air and reach the ears, a process begins in the human being It involves various bones, nerves, cells and membranes. Ultimately, the vibrations that are generated by the sound waves become nerve impulses that are interpreted by the brain .
Suppose there is a woman sitting in the Bank of a square. Behind her, a friend appears who calls her by name, without the woman seeing her. The person sitting is able to hear her name (since she perceives the sound in question) and, through a psychic and cognitive process, warns that they are calling her and even recognizes her friend's voice. Turning around, she observes her friend through her sense of vision.
While hearing is something that most human beings do with satisfactory results, there are various disorders that affect or cancel hearing. To hear, we need the inner, middle and outer ear to function properly. The sound waves enter through the outer ear, reach the middle and produce vibrations in the eardrum that are transmitted to the inner one through the ossicles (very small bones); finally the impulse Nerves travel from the inner ear to the brain, where they are identified as sounds.
When any of these parts is affected, the hearing process cannot be carried out with precision. Some diseases and most common disorders are:
* infections : They occur especially in children, but also in a small percentage of the adult population. They usually affect the middle ear and are called otitis media . The presence of fluid and mucus makes hearing difficult, as it prevents the passage of sound. It is very important to detect these infections in time in children who have not yet learned to speak, to avoid cognitive problems;
* tinnitus : It is a condition characterized by perception of rumors, hiss or jingle in the ears. It is a disease that causes frequent or constant discomfort, depending on the severity, and that affects many people worldwide. When the tinnitus is severe, difficulties appear to perform daily tasks such as work or study, to hear normally and even to sleep;
* Ménière's disease : affects the inner ear and usually appears on only one side. It is one of the common causes of deafness and may also be accompanied by tinnitus. Between his symptom severe dizziness, pain and pressure in the ear and intermittent hearing loss are found. Depending on the severity with which this disease occurs, sudden attacks may occur that cause the absolute loss of balance, with the consequent fall to the ground;
* barotrauma : is the hurt that cause the body to change water or air (barometric). For example, a change in altitude can produce a barotrauma characterized by earache, which is very common in air travel or in mountain areas. Among the most common symptoms of barotrauma are difficulty hearing, pain, dizziness and plugging of the ears. It is without a doubt a disorder that does not have serious consequences, but must be adequately addressed.