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One plausible explanation for why illusory blobs are seen in the 'black crosses on a white background' version of the Hermann grid is that a. off-centre cells are more active at the dark intersections of the grid than on-centre cells.b. on-centre cells are more active at the dark intersections of the grid than off-centre cells.c. off-centre cells are more active at the dark bars of the grid than on-centre cells.d. off-centre cells are less active at the dark intersections of the grid than at the dark bars of the grid.e. on-centre cells are less active at the dark intersections of the grid than at the dark bars of the grid.
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