The Principles of Psychology

Cover The Principles of Psychology
The Principles of Psychology
Herbert Spencer
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We judge of distance by at least three separate indica- tions. When the observed object is known to us, the angle it subtends, or, rather, the space which its image covers on the retina, aids in the estimate. The particular focal adjust- ments which the eyes undergo to obtain distinct vision, and which are accompanied by certain muscular sensations, assist.
And the muscular sensations accompanying due convergence of the visual axes, supply a third evidence. In ordioary vision these indications
...agree. But by that ingenious in- strument of Professor Wheatstone's invention — ^the Pseudo- scope — the last two are made to contradict each other.
The muscular actions by which the visual axes are adjusted being the more marked, and accompanied by the stronger sensations, give the preponderating evidence ; and the result is that when looked at through the Pseudoscope, convex objects seem concave and concave objects seem convex. By particular management, however — ^that is, by adding to the evidence from focal adjustment some further evidence — ^the verdict of consciousness may be suddenly reversed.


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