Just as the
eye can only see (attend to) a certain number of vibrations, for if
the requisite amount is added to, the result is blankness, darkness,
so the mind can only attend to a certain amount of complexity--add to
the complexity and attention ceases, but, a certain degree of
complexity is necessary to produce any conscious attention at all. In
experiments with a Metronome and the ticking of a watch, it is found
the attention at certain intervals gets weaker--from 2 to 3 seconds.
The impression produced by the ticking of the watch is less distinct,
it seems to disappear and then is heard again. "This is not from
fatigue in the sense organ," but apparently represents "a natural
rhythm in consciousness or attention," which interferes with the
accuracy of attention. What a suggestive fact this is! Have we not all
at times, felt an inexplicable difficulty in listening and attending
to certain speakers, which may perhaps be explained by a difference
between the rhythm of our own consciousness, and that of the voice of
the speaker. In Association of Ideas the time that it takes for one
idea to suggest another has been determined, but of course, it must be
the average time, for people differ enormously in the speed in which
ideas occur to them.
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