More on Rambam and נְבוּאָה: The "physical process"

From Jewish History with Rabbi Dr. Dovid Katz by R Dr. Dovid Katz.

The רִבּוֹנוֹ שֶׁל עוֹלָם sends a message from the Active Intellect to the rational faculty (hopefully to filter out error) and from thereto the imaginative faculty.


But what does this mean?