Semantic Memory
Our recognition of things around us is yet another isolated memory process. I have seen an aphasic, who couldn’t say a word, demonstrate his knowledge of the world by repairing a television set.
When it is severe and we lose recognition of things, which would hamper such an activity, we are said to have agnosia. It can be almost global so that we appear to be deaf or blind, or it can be very mild and transient.
To a lesser extent we may lose learned knowledge. This is an understanding of worldly processes and abstract concepts such as we may learn in school.
This may include things like our understanding of molecular structure, democracy, anatomy or how to repair a television set etc.
There is one other not so well understood memory process called implicit memory.