Storage: retaining info over certain period of time: associative networks: massive network of associated ideas & concepts. 3 major components: doesn"t correspond to specific brain structure: sensory memory, detects & holds lots of sensory info long enough to be recognized, sensory registers (initial info processors): Implicit memory: memory demonstrated thru change in behavior: e. g. skills, reflexes, conditioned responses. Impaired ability to remember info from before injury. Impaired ability to form new memories after injury. Amnesia: usually affects explicit memory, h. m: surgically removed part of brain important for forming memories, tested implicit memory got better over time. Dementia: general term of chronic disorder of mental processes marked by, loss of memory, mental abilities: personality changes & impaired reasoning, encompasses huge range of disorders. Alzheimer"s disease: progressive: starts out w minor symptoms, then deteriorates, symptoms, difficulty remembering names & recent events, apathy & depression: bc of diagnosis & changes in brain, difficulty speaking, walking, swallowing.