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The philosopher, to whom a sense-impression is a mere needle-prick, useful only as it starts his thoughts off on a tangent from it to the separate world of ideas, is not unnaturally misled by the poet's total absorption in the world of sense.
A new sense-impression came rushing up through the flow of thoughts; and lo! the light-spot jerked away towards it, swifter than a frightened fish. It was wonderful to think that upon that unstable, fitful thing depended all the complex motions of the man; that for the next five minutes, therefore, my life hung upon its movements. And he was growing more and more nervous in his work.
And this vast splendor was to report itself by one of the insignificant little channels by which men, locked in cramped physical bodies, interpret the giant universe a trivial sense-impression! That so terrible a communication could reach the soul via the quivering of a wee material nerve was on a par with that other grave splendor that God can exist in the heart of a child.
This being so, errors of introspection, supposing such to be found, will in the main be sufficiently distinguished from those of perception. Even an hallucination of sense, whether setting out from a subjective sensation or not, always contains the semblance of a sense-impression, and so would not be correctly classed with errors of introspection.
Besides the perception of external objects, and the inspection of our internal mental states, there are other forms of quasi-presentative cognition which need to be touched on here, inasmuch as they are sometimes erroneous and illusory. In the last chapter I alluded to the fact that emotion may arise as the immediate accompaniment of a sense-impression.
It is easy to see that this will favour illusion by leading to a confusion of the impression. Thus the timid man will more readily fall into the illusion of ghost-seeing than a cool-headed observant man, because he is less attentive to the actual impression of the moment. This inattention to the sense-impression will be found to be a great co-operating factor in the production of illusions.
Since I am just as ignorant how the sensation in my mind comes to pass as a sequel to the motion in the sense-organ; since, further, the body as an unconscious and non-rational being can effect nothing, it is neither I nor the body that causes the sensation. Both the bodily movement and the sense-impression are, rather, the effects of a higher power, of the infinite spirit.
We will now pass to the consideration of other illusions of introspection more analogous to what I have called the active illusions of perception. In our examination of these we found that a pure representation may under certain circumstances simulate the appearance of a presentation, that a mental image may approximate to a sense-impression.
Second, they furnish new impressions through the kinaesthetic sense, thus being a source of sense-impression. Third, they give rise to a greater number of ideas and link them up with the idea dominant at the moment. There is a further psychological effect of expression in the clarification of ideas.
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