weber fractions decibel scale of sound energy
TRANSCRIPT
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Sensory Physiology
Stimulus
(Physics)
(A)
Receptor
(Anatomy,Physiology )
(B)
Central Nervous System(Anatomy,Physiology)
(C)
Psycho- logical Response(Psychology)
(D)
Psychophysics
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Sense modality Detection threshold
Light A candle flame seen at 30 miles ona dark clear night (ca. 10 quanta).
Sound The tick of a watch under quietconditions at twenty feet (ca.0.0002 dynes/cm).
Taste One teaspoon of sugar in 2 gallonsof water.
Smell One drop of perfume diffused intothe entire volume of a 3 roomapartment.
Touch The wing of a bee falling on yourcheek from a distance of 1 cm.
Absolute Thresholds of MajorSenses
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Weber Fractions
Weber fraction Sensory Modality (Δ1/1)
( , )Vision brightness white light .08 ( , )Audition loudness noise .05 ( )Touch vibration at fingertip .04 ( )Kinesthesis lifted weights .02 ( )Taste table salt .08 ( )Smell butyl alcohol .07
REPRESENTATIVE VALUES FOR THE WEBER FRACTION FOR THE DIFFERENT SENSES
: 1971, , 1977.SOURCE Teghtsoonian and Caln
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Decibel Scale Of Sound Energy
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FECHNER’S LAW: = Klog I
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STEVEN’S LAW: = K(i)n
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Electromagnetic Spectrum
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Color
Cone
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Color Circle
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Cross Section Of The Eye
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Retinal Cells
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Cross Section Of Retina
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Path of
Light to
Rods &
Cones
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THEORETICAL THRESHOLD FUNCTION
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THRESHOLD FOR ONE QUANTUM
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Stimuli for “Subliminal” Threshold ExperimentWord Freq. Value* Word Freq. Value*lotus 10 kotex 1**capon 10 mixer 1raped 13 terse 4lathe 11 penis 1**belly 47 hilly 10noted 45 knack 13clear 1 filth 4whore 4 clove 4tiara 4 bitch 4
Av. Taboo 10.6Av. Neutral 10.3
*frequency of occurrence in 4 1/2 million words according to the Thorndike-Lorge semantic count.
**estimated frequency
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Payoff Matrices
Signal Signal
On Off On OffResponse: Yes +1c -10cYes +25c -
1cNo -1c +1c No -1c +1c
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Frequency Of Signals In Detection Experiment
Presentation Presentationrate of .9 rate of .2
Signal Signal
On Off On OffResponse Yes .97 .62 Yes .28 .04
No .03 .38 No .72 .96
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Rate of Hits and False Alarms as a Function of
the Relative Frequency of Trials on Which Signal was Presented.
% of trials on which signal is present
% hits % false alarms
90 96 80
50 72 40
10 39 5
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ROC Curves
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Day
Vision (cones)
Night
Vision (rods)
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Rod Cone Sensitivity Functions
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Dark Adaptation
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Effect of Vitamin A Loss on Dark Adaptation Threshold
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ACUITY
CHART
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Measuring
Visual
Acuity
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Effect of Illumination on Visual Acuity
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Distributions Of Rods And Cones
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Camera Vs. Eye
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Duplicity Theory
Cones: Rods:
Number: >7 x 106 >125 x 106 Connections with ganglion cells: 1:1
1: many
Wavelength of greatest sensitivity: 555 nm 505 nm
Color vision: yes no
Dark adaptation: ~7 min ~40 min
Spatial resolution: high low
Temporal resolution: fast slow
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Stabilized
Image
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Comparison Of Eye And CameraEYE CAMERA
Stability of image Constantly oscillating
Steady
Shutter opened Continuous during waking hours
Discrete (shutter is typically closed)
Image quality Poor Sharp
Sensitivity Dynamic range 1,000,000 : 1
Specific to type of film
Black/White or Color
Both Specific to type of film
Refinement of image after exposure
Yes No
Adaptation Yes No
Temporal contrast Yes No
Simultaneous Yes No
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Stimulus
Luminance Profile
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Mach Bands - Edge Enhancement Illusion
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Mach Bands
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Lateral Inhibition
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Interactions between excitatory & inhibitory cells How the retina enhances edges.
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No Lateral Inhibition
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Lateral Inhibition
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Hit Miss
False CorrectAlarm Negative
Respond Responds "yes" "no"
Stimulus present
Stimulus absent
THE FOUR POSSIBLE OUTCOMES OFTHE DETECTION EXPERIMENT
A PAYOFF FUNCTION FOR ASIGNAL DETECTION EXPERIMENT
RESPONSE
YES NO
ON
OFF
$0.25 $0.05
$0.01$0.05
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Rate of Hits and False Alarms as a Function of the Relative Frequency of Trials on
Which Signal was Presented.
% of Trials on Which %Hits: % False AlarmsSignal is present:
90 96 8050 72 4010 39 5
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No
Lateral
Inhibition
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Fovea