Section1-6 - 1/24/12 Magnitude Estimation Main Questions:...

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1/24/12 1 Main Questions: Detection : Minimum intensity we can perceive Discrimination : Ability to detect differences in similar stimuli Scaling : Intensity of the sensation Identifcation/Context : Placing a learned label on a particular sensation Stevens’ Power Law S = k*I b Relationship between change in sensation and change in intensity. Fechner’s law not accurate enough for all types of stimuli. Magnitude Estimation (1, 5, 0.5, 8) 0 10 20 30 40 50 60 70 80 0 20 40 60 80 100 Stimulus Magnitude Psycholgical Magnitude Brightness Length Shock Stevens’ Power Law S = k*I b b = 1 b < 1 b > 1 But…. .context matters Auditory System • Physics of sound • Relation of physics to perception (psychophysics/psychoacoustics) • The ear and transduction • Neural coding Sound wave = pressure wave
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1/24/12 2 Sine Wave 1 cycle Sine Wave (pure tone) 1 cycle Frequency = Speed/ λ = cycles per sec (cps) = Hertz (Hz) = (meters/sec)/(meters/cycle) = cycle/sec Intensity = amplitude = decibel (dB) • dB is a relative measure; not absolute pressure
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This note was uploaded on 04/09/2012 for the course EXP 3202 taught by Professor Staff during the Spring '12 term at Florida State College.

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Section1-6 - 1/24/12 Magnitude Estimation Main Questions:...

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