So... first of all, I'd like someone to look up the logical positivists and say what it is they actually believed. My impression is that so far as their verbal description of their philosophy went, if not its actual use, they claimed that the meaning of any phrase consisted entirely in its impact on experience, and that no other aspect of it is meaningful. This implies that a theory of photons which had photons vanishing as soon as they crossed the horizon of the expanding universe, and a theory which had the photons continuing undetectably onward, had the same meaning.

If this is not logical positivism, then let me be corrected.

The position you're describing sounds to me like what I would call reductionism, and I would agree with the caveat that certain meaningful entities can have logical elements - for example, I am willing to consider "the sum of 2 + 2" apart from any particular calculator that calculates it; its meaning is distinct from the meaning of "the result of calculator X" where calculator X is any physical thing I can point to including my own brain. I have no idea if this reflects reality, but I am unable to make my map work without logical as well as physical elements. I am, however, entirely willing to reduce every meaning to some mixture of physical stuffs and abstract computations.

Is there any point in arguing over whether we are "logical positivists" apart from the particulars of the stance? :)