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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: By this experiment another element, ideation, is taken away from the process of sensation. Volition, the final cause of all sensation, is also removed. The previous analysis shows that sensation, in its common acceptation, comprehends five distinct elements: namely, local impression, communication, spinal consciousness, cerebral consciousness, and ideation; all of which are the necessary antecedents of volition. The process which has just been described, and which is familiar to physiologists as conscious and unconscious. reflex action, is tho typo of the .most complex, as well as of the simplest, sensations. It is the only mode of activity which science can discern, either in the spinal cord or the brain. Those who do not believe in the freedom of the will regard volition as the culmination and subtlest form of reflex action; and those who take an opposite view admit that volition can bo exerted only through tho machinery of reflex action. Sight is sensation. Yet it is a much more complicated process than the one just described; and, consequently, requires for its accomplishment a much more complicated apparatus than answers for that; still it is essentially the same, and can be reduced to the same elements. In the process of visual sensation, there are the local impression of light on the eye, corresponding to the local injury of the frog's foot; communication, or telegraphing, by means of the optic nerve, to the tubercula quadrigemina, like that from the frog's foot to its spine; perception of the communication, or telegram, by the tubercula quadrigemina, corresponding to the spinal consciousness of the frog; telegraphing of the perception by the tubercula quadrigemina to a higher centre, the angular gyrus; and communication from the latter to the frontal convo...
| ISBN-13 | 9780217954273 |
|---|---|
| ISBN-10 | 0217954278 |
| Weight | 0.55 Pounds |
| Dimensions | 9.00 x 6.00 x 0.38 In |
| List Price | $19.99 |
| Format | Paperback |
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| Pages | 164 pages |
| Publisher | |
| Published On | 2009-08-01 |
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