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Aphonia is defined as the inability to produce voiced sound. [1] This may result from damage, such as surgery (e.g., thyroidectomy) or a tumor., [2] or can be a result of psychological means. Aphonia means "no sound.” In other words, a person with this disorder has lost their voice and is unable to communicate vocally. [3]
Aphasia, also known as dysphasia, [a] is an impairment in a person’s ability to comprehend or formulate language because of damage to specific brain regions. [2] The major causes are stroke and head trauma; prevalence is hard to determine, but aphasia due to stroke is estimated to be 0.1–0.4% in developed countries. [3]
Inflammation of the meninges, the membranes that envelop the brain and the spinal cord; may cause hearing loss or deafness. Middle ear Part of the ear that includes the eardrum and three tiny bones of the middle ear, ending at the round window that leads to the inner ear. Misarticulation Innacurately produced speech sound (phoneme) or sounds.
Spasmodic dysphonia, also known as laryngeal dystonia, is a disorder in which the muscles that generate a person's voice go into periods of spasm. [1] [2] This results in breaks or interruptions in the voice, often every few sentences, which can make a person difficult to understand. [1]
Individuals with aphasia who display anomia can often describe an object in detail and maybe even use hand gestures to demonstrate how the object is used, but cannot find the appropriate word to name the object. [3] Patients with anomic aphasia have relatively preserved speech fluency, repetition, comprehension, and grammatical speech.
In some cases the cause is unknown. However, there are various known causes of speech impairments, such as hearing loss, neurological disorders, brain injury, an increase in mental strain, constant bullying, intellectual disability, substance use disorder, physical impairments such as cleft lip and palate, and vocal abuse or misuse. [12]
Thought blocking is a neuropsychological symptom expressing a sudden and involuntary silence within a speech, and eventually an abrupt switch to another topic. [1] Persons undergoing thought blocking may utter incomprehensible speech; they may also repeat words involuntarily or make up new words.
One of the most important aspects of Paul Broca's discovery was the observation that the loss of proper speech in expressive aphasia is due to the brain's loss of ability to produce language, as opposed to the mouth's loss of ability to produce words.