What part of the brain does alexia affect?

Pure alexia typically results from a stroke within the distribution of the left posterior cerebral artery or from a tumor located in the posterior left hemisphere of the brain. In most cases, the left occipital lobe is damaged such that the primary visual cortex is destroyed.

What type of brain injury would lead to alexia with agraphia?

However, alexia and agraphia are 2 serious language disorders and have been reported to occur in only approximately 1% of anoxic brain injury cases [1], most of which are due to strokes.

What affects alexia?

Alexia is an acquired disorder resulting in the inability to read or comprehend written language.[1] The affected individuals remain capable of spelling and writing words and sentences but are unable to comprehend what was written by themselves.[1] This is differentiated from the mechanical inability to read, such as ...

What is alexia aphasia?

Abstract. Alexia is an acquired disturbance in reading. Alexias that occur after left hemisphere damage typically result from linguistic deficits and may occur as isolated symptoms or as part of an aphasia syndrome.

What is alexia Characterised by?

Pure Alexia (Letter-by-Letter Reading)

This striking syndrome is characterized by the inability to read aloud or to understand written text. Milder cases are distinguished by reading that is tediously slow.

Alexia without agraphia

What part of the brain causes apraxia?

Apraxia results from dysfunction of the cerebral hemispheres of the brain, especially the parietal lobe, and can arise from many diseases or damage to the brain. There are several kinds of apraxia, which may occur alone or together.

Which part is damaged in Alexia without agraphia?

Most cases of alexia without agraphia are due to cerebrovascular accidents from thromobotic or thromboembolic disease involving the left posterior cerebral artery (PCA), which results in an infarct of the left occipital cortex and the splenium of the corpus callosum.

What is peripheral alexia?

Pure or peripheral alexia is characterised by slow and inaccurate reading or by a reading “letter-by- letter” strategy. Central Alexia which is part of a general language disorder characterized by language errors as well as reading disabilities.

What is alexia and agraphia?

Abstract. Alexia with agraphia is defined as an acquired impairment affecting reading and writing ability. It can be associated with aphasia, but can also occur as an isolated entity.

Is alexia and dyslexia the same?

Pure alexia results from cerebral lesions in circumscribed brain regions and therefore belongs to the group of acquired reading disorders, alexia, as opposed to developmental dyslexia found in children who have difficulties in learning to read.

What are symptoms of alexia?

Alexia is a disorder of reading that results from damage to the brain. It affects reading aloud, understanding the meaning of written words, or both. Alexia is commonly associated with other language impairments and, together with agraphia, is particularly prominent after damage to the left angular gyrus.

What is posterior alexia?

Posterior or pure alexia is an uncommon acquired reading disturbance in which the loss of the ability to read is not associated with other language deficits.

What is surface alexia?

Surface Alexia. Patients with surface alexia appear to rely upon the pronunciations of written words in order to ascertain their meanings. An obvious consequence of this disorder is an inability to distinguish between homophonic words, such as flue, flu, and flew.

What is visual alexia?

Inability to recognize written or printed words due to a lesion in the brain. This is a form of visual agnosia.

What is central alexia?

Central alexia (CA; also known as alexia with agraphia; Dejerine, 1891) is a reading disorder that occurs within the context of a generalized language disorder (aphasia). Patients with CA find reading slow and effortful and make frequent errors (Leff and Starrfelt, 2013).

What part of the brain is damaged in apraxia of speech?

Apraxia is caused by a defect in the brain pathways that contain memory of learned patterns of movement. The lesion may be the result of certain metabolic, neurological or other disorders that involve the brain, particularly the frontal lobe (inferior parietal lobule) of the left hemisphere of the brain.

How does apraxia affect the brain?

People with apraxia may find it difficult to control or coordinate movements voluntarily. These individuals may also have brain damage that causes aphasia, a language impairment that reduces the ability to understand or use words correctly.

What is difference between aphasia and apraxia?

Both aphasia and apraxia are speech disorders, and both can result from brain injury most often to areas in the left side of the brain. However apraxia is different from aphasia in that it is not an impairment of linguistic capabilities but rather of the more motor aspects of speech production.

What are the types of alexia?

Four patterns of alexia (or dyslexia) have been recognized: letter-by-letter reading, deep, phonological, and surface dyslexia.

What is the Broca's aphasia?

Broca's dysphasia (also known as Broca's aphasia)

It involves damage to a part of the brain known as Broca's area. Broca's area is responsible for speech production. People with Broca's dysphasia have extreme difficulty forming words and sentences, and may speak with difficulty or not at all.

What causes surface dyslexia?

The cause of surface dyslexia

Like most sub-types of dyslexia, there is no clear reason for surface dyslexia. Some studies suggest it may be inherited, but there may be other risk factors. Risk factors of dyslexia: A family history of dyslexia or learning disabilities.

What does angular gyrus do?

The angular gyrus (AG) is a hub of several networks that are involved in various functions, including attention, self-processing, semantic information processing, emotion regulation, and mentalizing.

Can people with alexia write?

Reading and Acquired Dyslexia

This form of alexia is pure in the sense that patients with the disorder often speak and write normally. Recent work suggests that many patients with this disorder exhibit implicit reading in that they access information about written words of which they are unaware.

How is alexia treated?

Is dyslexia caused by brain damage?

It is thought to be caused by impairment in the brain's ability to process phonemes (the smallest units of speech that make words different from each other). It does not result from vision or hearing problems. It is not due to mental retardation, brain damage, or a lack of intelligence.