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Weber Fractions

Weber Fractions. Decibel Scale Of Sound Energy. FECHNER’S LAW:  = Klog I. STEVEN’S LAW:  = K(i) n. Electromagnetic Spectrum. Color Cone. Color Circle. Cross Section Of The Eye. Retinal Cells. Cross Section Of Retina. Path of Light to Rods & Cones. THEORETICAL THRESHOLD FUNCTION.

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Weber Fractions

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  1. Weber Fractions

  2. Decibel Scale Of Sound Energy

  3. FECHNER’S LAW:  = Klog I

  4. STEVEN’S LAW:  = K(i)n

  5. Electromagnetic Spectrum

  6. Color Cone

  7. Color Circle

  8. Cross Section Of The Eye

  9. Retinal Cells

  10. Cross Section Of Retina

  11. Path of Light to Rods & Cones

  12. THEORETICAL THRESHOLD FUNCTION

  13. THRESHOLD FOR ONE QUANTUM

  14. Stimuli for “Subliminal” Threshold Experiment Word Freq. Value* Word Freq. Value* lotus 10 kotex 1** capon 10 mixer 1 raped 13 terse 4 lathe 11 penis 1** belly 47 hilly 10 noted 45 knack 13 clear 1 filth 4 whore 4 clove 4 tiara 4 bitch 4 Av. Taboo 10.6 Av. Neutral 10.3 *frequency of occurrence in 4 1/2 million words according to the Thorndike-Lorge semantic count. **estimated frequency

  15. Payoff Matrices Signal Signal On Off On Off Response:Yes +1c -10c Yes +25c -1c No -1c +1c No -1c +1c

  16. Frequency Of Signals In Detection Experiment Presentation Presentation rate of .9rate of .2 Signal Signal On Off On Off Response Yes .97 .62 Yes .28 .04 No .03 .38 No .72 .96

  17. Rate of Hits and False Alarms as a Function of the Relative Frequency of Trials on Which Signal was Presented.

  18. ROC Curves

  19. Day Vision (cones) Night Vision (rods)

  20. Rod Cone Sensitivity Functions

  21. Dark Adaptation

  22. Effect of Vitamin A Loss on Dark Adaptation Threshold

  23. ACUITY CHART

  24. Measuring Visual Acuity

  25. Effect of Illumination on Visual Acuity

  26. Distributions Of Rods And Cones

  27. Camera Vs. Eye

  28. Duplicity TheoryCones: Rods: Number: >7 x 106 >125 x 106Connections with ganglion cells: 1:1 1: manyWavelength of greatest sensitivity: 555 nm 505 nmColor vision: yes noDark adaptation: ~7 min ~40 minSpatial resolution: high lowTemporal resolution: fast slow

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