What is Agnosia? Its Types
Agnosia is the disease characterized by some types of perception violation, resulted from the damage of cerebral cortex and nearby subcrustal structures. In violation of projective departments of the cerebral cortex, there may appear sensitivity disorders (decrease in hearing, violation of visual and painful functions). In a case when secondary departments of the cerebral cortex are damaged, the ability to perception and processing of the received information is lost.
Acoustic agnosia appears as a result of acoustic analyzer violation. If the temporal part of the left hemisphere was damaged, there is a violation of phonemic hearing which is characterized by loss of ability to distinguish speech sounds that can lead to speech violation in the form of sensory aphasia. Thus the expressional speech of the patient represents the so-called “verbal salad”. Also, there can be a violation of the letter from dictation and readings aloud. At damage to the right hemisphere of the patient ceases to distinguish all sounds and noise. If projective departments of the brain are damaged, all processes proceed with safety acoustical and visual systems, but with violation of the general perception and concept of situation. Most often this type of acoustic agnosia is observed at diseases having mental character. Arrhythmia of acoustic agnosia is characterized by an inability to understanding and reproduction of certain rhythm. Pathology is shown at the damage to the right temple. It is possible to allocate with a separate type of acoustic agnosia process which is shown by the violation of speech intonation understanding of other people. My Canadian Pharmacy tries to possess the preparations possible to treat all the diseases but of course, it is impossible however the medical science does its best to achieve this outcome.
Visual agnosia is a violation of ability to an identification of subjects and their image at the full safety of sight. Arises at numerous defeats of the occipital department of a cerebral cortex. Visual agnosia is subdivided into some subspecies:
Simultaneous agnosia is a violation of ability to the perception of a group of images which form a whole;
Color agnosia is an inability to distinguish colors at the kept color sight;
Alphabetic agnosia is an impossibility to learn letters. This pathology is called “the acquired illiteracy”. At safety of the speech, patients can’t either write or read. Develops at the damage of prepotent hemisphere of the occipital department.
Such type as spatial agnosia is characterized by the impossibility to learn spatial images and to be guided to a place. In such situations, the patient can’t distinguish right from left, confuses an arrangement of arrows on hours and in words interchanges the position of letters. It is shown as a result of the defeat of parietooccipital area. Diffusion violations of cortical structures can lead to a syndrome in which the patient ignores a half of space. At this option of spatial agnosia, it doesn’t notice the subjects or images located on the one hand at all (for example, with right).