Patients with a loss of long-term visual memory cannot access stored visual information at all, so according to the consensus models of memory and amnesia, they should not be able to support the coactivation underlying memory. In Farah’s model, a patient must satisfy three criteria to be classified as a case of long-term visual memory loss.
(i) The patient must be able to detect, draw, or describe the visual properties of an object that is present, which demonstrates that the deficit could not have arisen from motor, perceptual, or linguistic impairment.
(ii) The patient must not be able to recognize an object on sight alone, either by indicating its name or its function. The first two criteria define the patient as associative visual agnosia.
(iii) The patient should not be able to draw an object from memory (though some simplistic drawings are allowed), describe its visual characteristics from memory, or detect its visual image upon introspection. The third criterion helps isolate the deficit as one of long-term visual memory.
Common risk factors for visual amnesia include-
1. Any triggers such as surgery or head injury
2. When the memory issues started
3. Alcohol and drug use
4. Family history
5. History of cancer, depression, headaches, or seizures
A deficit in access to stored visual material and not by an impaired ability to encode or retrieve new material
Difficulty recalling facts, events, places, or specific details,An impaired ability to learn new information,Confusion
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