"One fascinating by-product of these experiments was that when subjects were
shown horizontal or vertical lines instead of a grid, their holes became
elliptical -- squashed in the direction of the lines. The researchers
speculate that this may be caused by some sort of propagation of neuronal
activity in the direction of the lines. Also curious was the fact that when
the subjects were shown a coloured image after being given the grid-and-TMS
combination, the resulting perforation in their view of the grid appeared to
take on a tinge of the same colour."
"All of this throws up what Michael Morgan of University College London
refers to in the same issue of Nature Neuroscience as "some very hard
conceptual problems," about the ill-understood and surprisingly fragile
relationships between cause and effect in the human brain."
"As they explain in the August issue of Nature Neuroscience, Kamitani and
Shimojo did something a bit different."