Color images in the brain : being an account of the detection of visible objects, seen posited on exchanged sides in the brain, after the intromission of impressions of light, reflected from external objects, one in each eye ... / by John Fearn.

  • Fearn, John, 1768-1837.
Date:
[1831]
Catalogue details

Licence: Public Domain Mark

Credit: Color images in the brain : being an account of the detection of visible objects, seen posited on exchanged sides in the brain, after the intromission of impressions of light, reflected from external objects, one in each eye ... / by John Fearn. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    OF COINCIDENT IMAGES AS THE PRINCIPLE OF THE DIRECTION OF OBJECTS. As the refutation of the supposed principle of the line drawn through the centre of the eye constitutes only one half of the desideratum on the subject; And as the principle of Co-incident Images is that which T have laid out in the Rationale, in order to propose for it; I shall embrace this opportunity to add a gloss to the details of the matter as expressed in that Treatise, especially since it is proper, for the sake of those who may read this Sup- plement without the Rationale, to afford some notion of the Proposition which the Abstract, already considered, has, by its silence and opposition, nullified, as presenting not a point worthy of consideration against the principle of the line drawn through the centre^ &c. No more, however, can here be attempted, than a gloss : For the proposition, with its various illustrations, occupies some space in the Rationale ; and it must be referred to, in order to form any adequate conception of the whole principle. The essence of the matter then is that, it having been demonstrated, throughout, that Visual impressions are recrossed in the head ; it was thereby demonstrated that there are TWO fields of images employed in the pro- cess of vision—namely—a field q/* Impressed Images in the eye,—and a Jield q/'Color Images in the BRAIN. This being a fact proved beyond any attempt at denial; it followed accordingly—that is it followed in an actual ocular induction of the fact,—(which I have given at length in the place referred to,—) that every point £