Probably won't help but I led to more safety regulations on companies
Bottom up is
Feature processing
Letter processing
Word processing
Phrase processing
Comprehension
Top down processing is just the opposite.
I would say this comes from the sociological perspective of the ordinary patients who require medicine and general health care and who may not be able to afford it since for example medicines are so expensive that without medicare or a good private health plan they may be out of reach of people's income.