Frames from the movie (animation).  Each frame represents one tenth of a second.  There are 8 series of frames.

In the 8th series of frames, for example, the first light came on in the third frame and the second light was turned on in the 5th frame.  That means it took 2 x 1/10 seconds for the reaction to happen (two tenths of a second, or 0.2 seconds).  It would be interesting to graph the number of seconds it took each time and take an average.  Does the reaction time get less over time?  If so, what could explain this?

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