"Does it talk about the micro evolution of the intellect ?" can you please elaborate on the term micro evolution so that i can answer your question...

continuing..we were discussing the term "impression".....this is one of the prime ingredients which constitutes as a catalyst in the evolution of intellect and mind....
the impression can be seen in two dimensions
- depth
- imprinted essence

whenever the data is collected and processed by the intellect, it can be stored with a value assigned for both depth and imprinted essence...when we recollect[smarana] anything very constantly the value of depth increases greatly...also all the characteristics of the "data" which is remembered will create an imprint which can also be referred to as "Vaasana"..Smrithi which is the lakshana of budhi creates a deep and long lasting imprint based on how repeatedly a data is recollected...

lets take a few examples here for the though processing...
- without being harmed by some animals, how is it that many are afraid of some particular animals[example: many are afraid of seeing a cockroach and they are clueless as to why they are afraid]
- how does the inclination towards certain food happen
- how does inclination towards certain behavior[being kind, cruel, etc] occur
- how is it that only a few people have the thirst for real knowledge while others blissfully ignore it

the intellect not only evolves but also gets conditioned by the impressions and the depth of it...evolution is over janmas...its a long process...its a very complicated process ...however no matter how long it takes, there exists an end point for this evolution when the state of reality is realized....