"at <a href=""https://www.youtube.com/watch?v=8Gk7EvCQGoo&amp;t=3m10s"">3:10</a> a scan is shown", but the speaker does not mention that it is displayed in two-dimensional slices that achieve three-dimensionality through temporality (the user scrolls through the slices - likely with a scroll-wheel - letting them build a 3d-interpretation through their memory allowing them to mentally conenct the slices into a 3d-model in their mind). While it seems obvious to me after a few seconds of viewing (mostly because I have seen such systems before, although the "eyes and then nose" thing helped make me certain), I am almost certain that this is one of those things most people won't intuitively understand, and instead think it is more like a video-image showing the entire 3d-brain projected to 2d and changing over time. As opposed to a still.<br>At least <i>I</i> have had times when I haven't realized such until having it explicitly pointed out to me (though it wasn't brain-scans those times, so no eyes/noses or other known structure to help clue me in).<br>Feels like one of those things that are really easy to see as obvious when used to a system, hard to realize when new to it, and where only if you had a very middling experience it is alien enough that one remembers it should probably be mentioned.<br><br>Figured it might make sense to make a note of it so people who didn't realize can do so retroactively. Hence this comment. But maybe adding an annotation to the video would make sense too?,(reply>), The video was a lot longer and we had to cut out a lot of that stuff!