Space and Vision: An Attempt to Deduce All Our Knowledge of Space from the Sense of Sight, with a Note on the Association PsychologyW. McGee, 1872 - 87 páginas |
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Términos y frases comunes
Abbott ABBOTT'S THEORY actual afford angles apparent magnitude argument asso ASSOCIATION PSYCHOLOGY Association Theory Associationist Bain's believe Berkeleians binocular vision chemical elements consciousness consequence cornea Dean Mansel direct perception distinct vision diversities of colour doctrine elements evident existence experience explanation extension by sight external objects fact field of distinct Geometry idea of space illusions images imagination immediate perception infinite divisibility J. S. Mill laws means Messrs Mill and Bain Mill's mind minimum visibile muscular motion muscular sensations observed optic nerve optical organ perceived perception of colour perception of distance perception of extension PERCEPTION OF RELIEF perceptions of sight perhaps phenomena plane presented object produce prove refutation Reid remark retina retinal pictures right lines enclosing seems seen Sight and Touch space-perceptions spacial spherical stereoscope SUPPLEMENTARY NOTES supposed surface tactual sensation tion touch and locomotion uncon vergence visible figure visible object visual field visual impressions visual perceptions visual sensations
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Página 39 - My health has been materially worse. My feelings at intervals are of a deadly and torpid kind, or awakened to a state of such unnatural and keen excitement, that, only to instance the organ of sight, I find the very blades of grass and the boughs of distant trees present themselves to me with microscopical distinctness. Towards evening, I sink into a state of lethargy and inanimation, and often remain for...
Página 40 - At first he could bear but very little light, and the things he saw, he thought extreamly large; but upon seeing things larger, those first seen he conceived less, never being able to imagine any lines beyond the bounds he saw: the room he was in, he said, he knew to be but part of the house, yet he could not conceive that the whole house could look bigger.
Página 13 - But a perception of the distinction of colours necessarily involves the perception of a discriminating line; for if one colour be laid beside or upon another, we only distinguish them as different by perceiving that they limit each other, which limitation necessarily affords a breadthless line, — a line of demarcation. One colour laid upon another, in fact, gives a line returning upon itself, that is, a figure. But a line and a figure are modifications of extension. The perception of extension,...
Página 13 - It can easily be shown that the perception of colour involves the perception of extension. It is admitted that we have by sight a perception of colours, consequently a perception of the difference of colours. But a perception of the distinction of colours necessarily involves the perception of a discriminating line; for if one colour be laid beside or upon another, we only distinguish them as different by perceiving that they limit each other, which limitation necessarily affords a breadthless line,...
Página 48 - And now being lately couched of his other eye, he says, that objects at first appeared large to this eye, but not so large as they did at first to the other ; and looking upon the same object with both eyes, he thought it looked about twice as large as with the first couched eye only, but not double, that we can any ways discover.
Página 14 - But, in the second place, the essential import of visible form is something not attainable without the experience of moving the eye. If we looked at a little round spot, we should know an optical difference between it and a triangular spot, and we should recognize it as identical with another round spot ; but that is merely retinal knowledge, or optical discrimination.
Página 15 - ... that come from the object, which it is evident we do not. The argument supposes no such thing. The argument is this. We cannot see anything which is not painted on our retina ; and we see things alike or unlike, according as they are painted on the retina alike or unlike. The distance between an object to our right and an object to our left is a line presented sideways, and is therefore painted on our retina as a line ; the distance of an object from us is a line presented endways, and is represented...
Página 14 - ... muscular sense. But to confer on these discriminative impressions the name which denotes our matured and perfected cognition of Extension, or even to assume that they have in their nature anything in common with it, seems to be going beyond the evidence.
Página 13 - ... colour be laid beside or upon another, we only distinguish them as different by perceiving that they limit each other, which limitation necessarily affords a breadthless line, — a line of demarcation. One colour laid upon another, in fact, gives a line returning upon itself, that is, a figure. But a line and a figure are modifications of extension. The perception of extension, therefore, is necessarily given in the perception of colours.* And farther on: All parties are, of course, at one in...
Página 44 - We must learn to feel that a slow motion for a long time is the same as a quicker motion with less duration ; which we can easily do by seeing that they both produce the same effect in exhausting the full range of a limb.