I don’t think there is evidence either way. But, I would guess technically they are different thoughts, just all reiterating the same core, favorite theme(s). A single thought arises, persists for a time, then ceases. Just as there is no permanent soul that goes from body to body as lives arise and cease, so perhaps there is no permanence to thought. Maybe the common themes that go from one thought to the next are like the ‘karma’ of individual thoughts?Is there any evidence for it that the thought is the same one or another one with the same content?
The raw sense data - for the sight sense, at least - occurs immediately, and is a combination of two things: (1) color and (2) intensity. When I move my head from one side of the room to the other, all “things” that are seen are simply combinations of little pinpoints that have a certain color (frequency in the spectrum), and brightness (intensity). Those are assembled into “things” by mind.Find out how thoughts work. Slowly look from one side of the room to the other. What is actually seen, the raw sense data?
And what is added by thoughts? When does it get added? Before it object is seen, during or afterwards?
Form (e.g. “round,” “straight,” “shiny,” “dull,” etc.) is a mental construct. “Objects” are another layer of mental construct on top of that. The mirror is a combination of four “straight” “sides” that has a “shiny” center. The “carpet” is an expanse of “dull” and “off-white” color, with slight variation in intensity, and with small darker-colored spots here and there, which I call “dirt.”
This additional mental constructing - what turns color and intensity into “shapes” and “patterns” that then further get turned into “objects” - seems to happen almost immediately upon sensory contact. Definitely not before the object is seen...that is certain. But almost immediately upon seeing. I see the color red that is interpreted by mind as “towel.” And then once the “towel” is recognized, mind starts piling higher and higher level thoughts on top of it…”that towel is wet…” “...why is it on the floor and not hanging to dry?”
This seems to accord with the Buddha’s teaching in MN 148 (Chachakkha Sutta):
"'The six classes of feeling should be known.' Thus was it said. In reference to what was it said? Dependent on the eye & forms there arises consciousness at the eye. The meeting of the three is contact. With contact as a requisite condition there is feeling..."
As SOON as the raw sensory data is processed by the eye (or ear, nose, etc.), mind steps in, and starts to “make sense of it.” [And BTW, haha, funny and ironic English saying there, to “make sense” of something is to assemble raw data into a construct that the mind is comfortable with. The very phrase “to make sense of” seems to imply that the sensory input is not enough - that it has to be interpreted to mean something that a mind can understand…]

