I am not just presuming that conscious perception can't be defined by physical reactions alone. I am postulating the impossibility of material reactions alone being able to perceive themselves.
You can postulate, but unless you support it with anything then it's just spitballing.
Conscious perception necessitates awareness of material reactions and properties.
Conscious perception requires perception of a conscious variety - well colour me convinced!
The question is this - How can a set of material reactions represent a conscious perception of other material reactions?
That's an interesting question, certainly. More important, whilst you wait for an answer - because currently we don't know - is why would you think there was anything else?
What is capable of perception in an entirely material environment?
People, at least, it seems. Unless you've evidence of something non-material?
O.