Description
Excerpt from Quarterly Journal of Experimental Physiology, Vol. 1
As indicator I have used, not the mechanical, but the electrical response of a muscle recording on a photographic plate, moving at a known and equable rate, the movement imparted to the meniscus of the capillary electrometer the moment an electrical change occurs at a spot connected with this instrument. The fact that the electrical response in the organ, as well as its manifestation in the recording instrument, occurs without any delay as soon as the recording spot is reached, and that it is not necessary for the whole muscle to be implicated before a record can be obtained, obviates what seems to me to be the principal objection to Wundt''s experiments. The electrical response has the further advantage over the mechanical response, for the measurement of brief time intervals between different events occurring in a muscle, that the effect not only begins without delay, but, when in existence, outlasts the stimulus (which, either directly or indirectly, produces it) by a so much shorter time. A second effect, therefore, occurring in the muscle only a few thousandths of a second after a first, would have quite a distinct manifestation when recorded by such an instrument as the capillary electrometer, whereas in the record of the contraction of the muscle two such effects would be merged into one. This being so, there should be no difficulty in recording on the same photographic plate, and measuring the time interval between, the two electrical effects produced at one and the same spot of the muscle in response to simultaneous excitation of efferent and afferent nerve respectively; nor is there any such difficulty, provided that the cord is sufficiently sensitive for an effectual response to be obtained from it at all when the stimulus applied to the afferent nerve is single and instan taneous, as for the purpose in hand it must be.
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This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
As indicator I have used, not the mechanical, but the electrical response of a muscle recording on a photographic plate, moving at a known and equable rate, the movement imparted to the meniscus of the capillary electrometer the moment an electrical change occurs at a spot connected with this instrument. The fact that the electrical response in the organ, as well as its manifestation in the recording instrument, occurs without any delay as soon as the recording spot is reached, and that it is not necessary for the whole muscle to be implicated before a record can be obtained, obviates what seems to me to be the principal objection to Wundt''s experiments. The electrical response has the further advantage over the mechanical response, for the measurement of brief time intervals between different events occurring in a muscle, that the effect not only begins without delay, but, when in existence, outlasts the stimulus (which, either directly or indirectly, produces it) by a so much shorter time. A second effect, therefore, occurring in the muscle only a few thousandths of a second after a first, would have quite a distinct manifestation when recorded by such an instrument as the capillary electrometer, whereas in the record of the contraction of the muscle two such effects would be merged into one. This being so, there should be no difficulty in recording on the same photographic plate, and measuring the time interval between, the two electrical effects produced at one and the same spot of the muscle in response to simultaneous excitation of efferent and afferent nerve respectively; nor is there any such difficulty, provided that the cord is sufficiently sensitive for an effectual response to be obtained from it at all when the stimulus applied to the afferent nerve is single and instan taneous, as for the purpose in hand it must be.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Details
Publisher - Forgotten Books
Language - English
Hardback
Contributors
Author
E. A. Schäfer
Published Date -
ISBN - 9780666802385
Dimensions - 22.9 x 15.2 x 2.4 cm
Page Count - 444
Paperback
Contributors
Author
E. A. Schäfer
Published Date -
ISBN - 9781331949091
Dimensions - 22.9 x 15.2 x 2.4 cm
Page Count - 446
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