-most old people dont get it, thought too many do.

- only in certain people as consequence of specific neurological conditions

1. loss in number of neurons and connections, mostly in frontal and temporal lobes

2. presence of neurofibrillary tangles -> impeding ability to effectively transmit signal

3. presence of amyloid plaques -> makes difficult for neurons to fuinctin cause they degenerate axons

4. decrease in acetylcholine production -> critical to learning and memory

1. short-term memory impaired: no in maintaining info but controlling flow of thought in central executive

- trouble managing memories in dual-task

- no recency effect for large sets of info

2. impaired episodic memory, with Ribot gradient

3. eventually also semantic memory succumbs

- more trouble with general public info then autobiographical

4. less effect on implicit memory & metamemory processes