Presumably these memory systems are part of the processing systems that utilize the information. These may include subcortical and cortical systems. For example, mirror reading may involve implicit memory systems that are part of the cortical language centers as well as eye-movement control centers in the cortex and subcortical areas. Anterograde amnesia is the syndrome usually referred to as pure memory disorder. Other cognitive abilites, such as language and visual spatial processing, are also intact.
Intelligence is usually normal.
Certain implicit and procedural memories are substantially intact. Theories of multiple systems have been used to explain the dissociation of certain memory content in amnesia. For example, if immediate recall of information is possible within the context of impaired delayed recall, then immediate recall must be mediated by a processing system that is distinct from the storage of information over an extended period of time. It has long been postulated that verbal and visual-spatial information is stored independently in the brain. The question remains whether information is actually consolidated and stored within each hemisphere.