It's a bit funny, the qualia thing and sampling rates.

Obviously we hope what we learn from e.g. psychology and fMRI will help us explain more things about the mind, and surely most researchers in psychology hope their research will help us get some answers on things related to qualia as well. And almost certainly most good / consistent reductionist researchers must believe that qualia arise from the brain, at least in significant part.

However, precisely by this reductionist logic, and since it is immediately and phenomenally clear that the rate of change of qualia in the mind (or the "amount" of different qualia, i.e. images or sounds that one can process or generate in the mind in under a second) is incredibly fast, it follows immediately and logically without any need for an experiment that fMRI cannot have the temporal resolution needed for a rich understanding of the mind, simply based on knowing the TR (temporal sampling resolution) is so poor. And yet, I also find a lot of people in scientific brain research go oddly silent or seem to refuse to accept this argument unless some strange sort of published, quantificationist operationalization can be pointed to (hence my pre-emptive mentioning information transmission in neurons in under 100ms).

I'm not sure I'd call this scientism, exactly, I tend to see it as "selective quantificationism", i.e. that certain truths can only be proven as true if you introduce some kind of numerical measurement procedure and metrical abstraction. Like, no one demands a study with Scoville units to prove that e.g. a ghost pepper is at least an order of magnitude hotter than candied ginger, even though this is as blazingly obvious as the fact that the mind moves too fast for something that can barely capture images of the brain at a rate of two per second.