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Lecture 10

PSY3108 Lecture 10: Lecture 10 – Auditory Perception 2
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6 Pages
15 Views
Winter 2017

Department
Psychology
Course Code
PSY 3108
Professor
Sharon Lee
Lecture
10

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Lecture 10 Auditory Perception 2
Topic Outline for Today
Finish up hearing pathways
Introduce perceptual topics
- Intensity & Loudness
- Frequency & Pitch
- Auditory Space Perception
Intensity and Loudness
Loudness is the subjective perceptual quality of sound related most directly to
pressure or intensity
But loudness also depends on frequency of sound, among other things (x and y
axis)
Absolute Detection Threshold
The pressure at which loudness is greater than 0(i.e., absolute threshold) varies according
to Hz
Max. Sensitivity at 2-5 kHz,
Also, where human speech has most energy (social aspect to measurements)
Psychophysical Function the min. audibility curve for humans
Plot of absolute threshold as a function of sound frequency produces the minimal
audibility curve.
Sound detection is best around 20004000 Hz; threshold increases on either side
of this range.
Sound intensity values that produce pain are known as terminal threshold.
Range of intensities for normal hearing occurs within the space between these
curves (shaded region).
find more resources at oneclass.com
find more resources at oneclass.com
Minimum Audibility Curve
Terminal Threshold is
point of pain
Minimum audibility
(threshold) varies by frequency
Normal hearing range is
shaded area
Fundamental Concept: Psychophysical vs. Psychometrics
Psychometric Function:
Function of physical quantity & behaviour (e.g., stimulus intensity and
perceived magnitude)
Shows one threshold
Psychophysical Function:
Function of two physical quantities
Shows how threshold on one physical quantity varies as a function of the
other (e.g., frequency and sound level)
Human
Conversation
find more resources at oneclass.com
find more resources at oneclass.com

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Description
find more resources at oneclass.com Lecture 10 – Auditory Perception 2 Topic Outline for Today  Finish up hearing pathways  Introduce perceptual topics - Intensity & Loudness - Frequency & Pitch - Auditory Space Perception Intensity and Loudness  Loudness is the subjective perceptual quality of sound related most directly to pressure or intensity  But loudness also depends on frequency of sound, among other things (x and y axis) Absolute Detection Threshold The pressure at which loudness is greater than 0(i.e., absolute threshold) varies according to Hz  Max. Sensitivity at 2-5 kHz,  Also, where human speech has most energy (social aspect to measurements) Psychophysical Function – the min. audibility curve for humans • Plot of absolute threshold as a function of sound frequency produces the minimal audibility curve. • Sound detection is best around 2000–4000 Hz; threshold increases on either side of this range. • Sound intensity values that produce pain are known as terminal threshold. • Range of intensities for normal hearing occurs within the space between these curves (shaded region). find more resources at oneclass.com find more resources at oneclass.com Minimum Audibility Curve  Terminal Threshold is point of pain  Minimum audibility (threshold) varies by frequency  Normal hearing range is Human shaded area Conversation Fundamental Concept: Psychophysical vs. Psychometrics Psychometric Function:  Function of physical quantity & behaviour (e.g., stimulus intensity and perceived magnitude)  Shows one threshold Psychophysical Function:  Function of two physical quantities  Shows how threshold on one physical quantity varies as a function of the other (e.g., frequency and sound level) find more resources at oneclass.com find more resources at oneclass.com Other factors affecting loudness: • Binaural vs. Monaural presentation:  Threshold is 6 dB lower with two ears (spatial integration) • Duration of sound:  Threshold increases below 200 ms (temporal integration) Fundamental Concept: Spatial & Temporal Integration  Any sensor (biological or artificial) must integrate signals across a certain range of space and time  Longer/larger integration provides greater sensitivity but lower acuity (details can be lost)  Recall spatial integration in somatosensory systems Questions  What is the minimal audibility curve? Frequency and Intensity  What is the dynamic range of the auditory system? In between minimum audi
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