Many psychologists ... ...

Many psychologists ... thought by turning their attention to their own consciousness to be able to explain what happened when we were thnking. Or they sought to attain the same end by asking another person a question, by means of which certain processes of thought would be excited, and then by questioning the person about the introspection he had made. It is obvious ... that nothing can be discovered in such experiments.
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 Wilhelm Wundt

Quotes from the same author

We know, from ordinary life, that we are not able to direct our attention perfectly steadily and uniformly to one and the same object... At times the attention turns towards the object most intensely, and at times the energy flags.
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 Wilhelm Wundt
Contractile movements arise, sometimes at the instigation of external stimuli but sometimes also in the absence of any apparent external influence.
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 Wilhelm Wundt
Psychology, on the other hand, seeks to give account of the interconnexion of processes which are evinced by our own consciousness, or which we infer from such manifestations of the bodily life in other creatures as indicate the presence of a consciousness similar to our own.
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 Wilhelm Wundt
Now, there are a very large number of bodily movements, having their source in our nervous system, that do not possess the character of conscious actions.
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 Wilhelm Wundt
In the course of normal speaking the inhibitory function of the will is continuously directed to bringing the course of ideas and the articulatory movements into harmony with each other. If the expressive movement which which follows the idea is retarded through mechanical causes, as is the case in writing ... such anticipations make their appearance with particular ease.
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 Wilhelm Wundt