This seems very simple. Yet it was slowly discovered that the
explanation is far too simple and that it does not in the least do
justice to the true experiences. With the advance of modern laboratory
psychology the experimental investigations frequently turned to the
analysis of our perception of movement. In the last thirty years many
researches, notably those of Stricker, Exner, Hall, James, Fischer,
Stern, Marbe, Lincke, Wertheimer, and Korte have thrown new light on the
problem by carefully devised experiments. One result of them came
quickly into the foreground of the newer view: the perception of
movement is an independent experience which cannot be reduced to a
simple seeing of a series of different positions. A characteristic
content of consciousness must be added to such a series of visual
impressions. The mere idea of succeeding phases of movement is not at
all the original movement idea. This is suggested first by the various
illusions of movement. We may believe that we perceive a movement where
no actual changes of visual impressions occur. This, to be sure, may
result from a mere misinterpretation of the impression: for instance
when in the railway train at the station we look out of the window and
believe suddenly that our train is moving, while in reality the train on
the neighboring track has started.
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