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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Agnosia | 2/2 | https://en.wikipedia.org/wiki/Agnosia | reference | science, encyclopedia | 2026-05-05T07:25:58.633985+00:00 | kb-cron |
== Treatment == For all practical purposes, there is no direct cure. Patients may improve if information is presented in other modalities than the damaged one. Different types of therapies can help to reverse the effects of agnosia. In some cases, occupational therapy or speech therapy can improve agnosia, depending on its cause. Initially many individuals with a form of agnosia are unaware of the extent to which they have either a perceptual or recognition deficit. This may be caused by anosognosia, which is the lack of awareness of a deficit. This lack of awareness usually leads to a form of denial and resistance to any form of help or treatment. There are various methods that can be used which can help the individual recognize the impairment in perception or recognition that they may have. A patient can be presented with a stimulus to the impaired modality only to help increase their awareness of their deficit. Alternatively, a task can be broken down into its component parts so that the individual can see each part of the problem caused by the deficit. Once the individual acknowledges their perceptual or recognition deficit, a form of treatment may be recommended. There are various forms of treatment, such as compensatory strategies with alternate modalities, verbal strategies, alternate cues and organizational strategies.
=== Verbal strategies === Using verbal descriptions may be helpful for individuals with certain types of agnosia. Individuals such as prosopagnosics may find it useful to listen to a description of their friend or family member and recognize them based on this description more easily than through visual cues.
=== Alternate cues === Alternate cues may be particularly useful to an individual with environmental agnosia or prosopagnosia. Alternate cues for an individual with environmental agnosia may include color cues or tactile markers to symbolize a new room or to remember an area by. Prosopagnosics may use alternate visual cues such as a scar on an individual's face or crooked teeth, or cues from other senses, like the sound of an individual's voice, in order to recognize the individual. Hair color and length can be helpful cues as well.
=== Organizational strategies === Organizational strategies may be extremely helpful for an individual with visual agnosia. For example, organizing clothes according to different hangers provides tactile cues for the individual, making it easier to identify certain forms of clothing as opposed to relying solely on visual cues.
=== Current research === There are clinical trials being done to further research for treatments. The National Institute of Neurological Disorders and Stroke (NINDS) supports research for rare diseases like agnosia. Some organizations recruit for trials via ClincalTrials.gov and provide status updates on the trials.
== History == The term agnosia comes from the Ancient Greek ἀγνωσία (agnosia), 'ignorance, absence of knowledge'. It was introduced by Sigmund Freud in 1891: "For disturbances in the recognition of objects, which Finkelnburg classes as asymbolia, I should like to propose the term 'agnosia'." Prior to Freud's introduction of the term, some of the first ideas about agnosia came from Carl Wernicke, who created theories about receptive aphasia in 1874. He noted that individuals with receptive aphasia did not possess the ability to understand speech or repeat words. He believed that receptive aphasia was due to lesions of the posterior third of the left superior temporal gyrus. Due to these lesions, Wernicke believed that individuals with receptive aphasia had a limited deafness for certain sounds and frequencies in speech. After Wernicke, came Kussmaul in 1877 who attempted to explain why auditory verbal agnosia, also known as word deafness, occurs. Contrary to Wernicke's explanations, Kussmaul believed auditory verbal agnosia was the result of major destruction to the first left temporal gyrus. Kussmaul also posited about the origins of alexia (acquired dyslexia) also known as word blindness. He believed that word blindness was the result of lesions to the left angular and supramarginal gyri. Heinrich Lissauer shared his ideas about agnosia after Wernicke and Kussmaul. In 1890, he theorized that there were two ways in which object recognition impairment could occur. One way in which impairment could occur was if there was damage to early perceptual processing or if there was damage to the actual object representation. If the actual object representation was damaged, this would not allow the object to be stored in visual memory, and therefore the individual would not be able to recognize the object. During the time of Wernicke, Kussmaul and Lissauer there was little known about the cerebral cortex. Today, new neuroimaging techniques have made it possible to expand our knowledge of agnosia greatly.
== See also == Agnoiology – Study of ignorance Pyrrho – Greek philosopher and founder of Pyrrhonism (c.360-c.270 BC) who suspended judgement of the senses to attain freedom from disturbance
== References ==
== External links ==
Types and brain areas Total Recall: Memory Requires More than the Sum of Its Parts Scientific American (accessdate 2007-06-05)