Explain how principles that define the cognitive level of analysis may be demonstrated in research

There is an important biological basis for all human cognitive processing and behavior.
Original principle

Alois Alzheimer (1906) on Alzheimer's Disease
Alzheimer observed a patient with strange behavioral symptoms including loss of memory. A postmortem autopsy showed the patient had large buildup of plaque, later known to be amyloid-beta, and neurofibrillary entanglements. Here, the cognitive process of memory was biologically influenced by the buildup of plaque and/or neurofibrilliary entanglements.

Jesse

Simon Baron-Cohen et. al (2005) on Savant Daniel Tammet
Daniel Tammet, a savant widely known for his incredible memory, was researched on. Testing using fMRIs showed that Daniel was known to have synesthesia, as a result of cross-wiring from the brain between the visual areas of the brain and the numerical areas. This allowed him to attribute items such as digits to images, explaining his unusual memory.

Jesse

Another biological principle
Link to it here.

Study, including researcher name, year, and a nice title.
Describe it here, and show how this connects to the principle.