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Thu Oct 22 14:52:37 BST 2009 by ben
http://www.citeulike.org/user/agcs/article/3090361
This is due to saccades.
http://www.citeulike.org/user/agcs/article/3090361
"When voluntary saccadic eye movements are made to a silently ticking clock, observers sometimes think that the second hand takes longer than normal to move to its next position. For a short period, the clock appears to have stopped (chronostasis). Here we show that the illusion occurs because the brain extends the percept of the saccadic target backwards in time to just before the onset of the saccade. This occurs every time we move the eyes but it is only perceived when an external time reference alerts us to the phenomenon."