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Home > Biographies & Memoire > Biography and non-fiction prose > Anthologies: general > On the Perception of Small Differences; With Special Reference to the Extent, Force and Time of Movement
On the Perception of Small Differences; With Special Reference to the Extent, Force and Time of Movement

On the Perception of Small Differences; With Special Reference to the Extent, Force and Time of Movement


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...law does not obtain, even within narrow limits, for the force of movement. We have given our reasons for holding that the just noticeable difference is an arbitrary point without objective criterion. We think it cannot be used as a test for comparing different observers. We see that it failed with J. and C. In Parts IV. and V. we shall find that some observers rarely think their judgment correct, unless it be in fact correct, while others are continually sure that they notice a difference which is not present. If observers be arranged according to the difference they think they can perceive, an order exactly the reverse of their real fineness of discrimination will often be obtained. An observer may, indeed, keep the just noticeable difference fairly constant under the same circumstances, but this, we think, is because he has in mind a certain apparent amount of difference or degree of confidence. When the circumstances are altered, it is very difficult for the observer to give the same value to the just noticeable difference. Thus "just greater" for J. was 34 with 200, and 56 with 1600. We find, therefore, that the just noticeable difference was less than doubled when the stimuli were taken eight times as great. On regarding the variable error, however, we see that for 200 it is less than half the just noticeable difference, and we conclude that the observer could usually notice this difference, and on regarding the percentage of wrong cases, we see that it was, in fact, misjudged only three times out of 100 trials. With 1600, on the other hand, the variable error is nearly as great as the just noticeable difference, and we must conclude that the observer would often fail to notice this difference; and on regarding the percentage of wrong cases, ...


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Product Details
  • ISBN-13: 9781130113907
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130113906
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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