I look at something, say, the table my feet rest on. I perceive the table. Is this purely a mental event (idealism)? Or is my perception that of a mind-independent object (realism)? If it were the latter, there would still be mental activity, obviously, even though the object itself is not mental. However, is the mind predisposed to reality or a blank slate of sorts? Chomsky did some interesting work in the linguistic arena that suggested that there is a universal sort of grammar hardwired into us. Perhaps this carries over into general perception? Perhaps we have (a la Kant) categories with which we impose order on the world of experience.
But suppose I were to suggest that it’s the world that imposes it’s categories onto us. T.F. Torrance goes into great detail on this subject, generally in relation to theology, but it applies to metaphysics as well. God is a reality independent of our thought or perception of Him, and based on His self-revelation we ‘generate’ concepts that are worthy of Him. We have to ‘unlearn’ (apophaticism) our preconceived ideas and allow the force of His reality to impress His own categories and concepts on our mind.
Could this apply to our knowledge of the external world as well? That as we come into relation to the being of objects, reality itself impressions its own concepts upon us? The worlds being forces itself on us as we attempt to penetrate into the nature of reality, forcing us to abandon our categories as we inquire more deeply.
Maybe, maybe not. I’m not sure it makes sense to speak of all that without conceding that the mind is predisposed to reality (the fit of the intellect to reality, to use the medieval phrase. This isn’t to say that our mental operations create the reality we perceive (et esse percepti, I think is the phrase) but rather that our mental categories make sense of the world of sensory experience. Perhaps our categories can be abandoned or reshaped in the light of true being.