To appear in Visual Cognition.
The results obtained were very similar to those obtained in prior experiments showing failure to detect changes occurring simultaneously with saccades, flicker, or "mudsplashes' in the visual scene: many changes were very hard to detect, and Marginal Interest changes were harder to detect than Central Interest changes.
Analysis of eye movements showed, as expected, that the probability of detecting a change depended on the eye's distance from the change location. However a surprising finding was that both for Central and Marginal Interest changes, even when observers were directly fixating the change locations (within 1 degree), more than 40% of the time they still failed to see the changes. It seems that looking at something does not guarantee you "see" it.
The results are interpreted in terms of the idea that what the observer sees during scene exploration is not determined primarily by the location in the scene being fixated by the eyes, but by the scene aspects being attended to. A theory is summarized which applies to the other experiments in the literature on change blindness, and some new predictions are put forward.