Ch. 11 - Auditory+Perception

Ch. 11 - Auditory+Perception - Psychophysics &...

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Unformatted text preview: Psychophysics & Physiology of Hearing Today’s Questions – Part 1 Psychophysics of hearing : What is sound? What are the physical & perceptual dimensions? What factors affect detection & discrimination? How are complex tones formed from pure tones? Today’s Questions – Part 2 Physiology of hearing : What are the parts of the ear, & their functions? What is the place theory of pitch perception? What is the phase locking theory? How do cochlear implants work? What are the pathways of the auditory system, & how are they specialized? Introduction to Sound “I heard it! I heard it!” If a tree falls in the forest & no one is around to hear it, would there be a sound? Introduction to Sound Definitions of sound : Physical: • Sound = series of changes in pressure in an elastic medium (e.g., air or water) Perceptual: • Sound = perceptual response, or an experience we have when we hear Dimensions of Sound Dimensions of Sound amplitude wavelength of 1 cycle above normal pressure below normal pressure Dimensions of Sound Physical vs. perceptual dimensions : Frequency (Hz) Pitch Amplitude (dB) Loudness Dimensions of Sound Frequency & pitch : Hearing range: 20 – 20,000 Hz High vs. low pitch: Dimensions of Sound Amplitude & loudness : Soft whisper = 20 dB Conversation = 60 dB Busy traffic = 90 dB Motorcycle = 90 dB Rock concert = 120 dB Jet takeoff = 140 dB Gunshot = 160 dB Ear damage = 90 dB Hearing threshold = 0 dB Pain threshold = 150 dB Detection & Discrimination Factors for detection & discrimination : Amplitude (sound pressure level) Frequency Detection & Discrimination 50 100 500 1000 5000 10000 Frequency (Hz) 160 140 120 100 80 60 40 20 0 –20 Sound pressure level (dB) Pain threshold Hearing threshold (audibility curve) Dynamic range of hearing (auditory response area) Speech Detection & Discrimination 50 100 500 1000 5000 10000 Frequency (Hz) 160 140 120 100 80 60 40 20 0 –20 Sound pressure level (dB) Equal loudness contours Pure vs. Complex Tones Pure tone Complex tone Pure vs. Complex Tones Combining pure tones : In-phase: Out-of-phase: Active noise suppression Pure vs. Complex Tones Frequencies of musical tones : Additive synthesis Fourier analysis Fundamental frequency 2 nd harmonic 3 rd harmonic Composite wave Pure vs. Complex Tones Frequencies of musical tones : Pure vs. Complex Tones Physical vs. perceptual dimensions : Harmonic structure Timbre Notes Chroma Today’s Questions – Part 2 Physiology of hearing : What are the parts of the ear, & their functions?What are the parts of the ear, & their functions?...
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This note was uploaded on 11/12/2009 for the course PSY 3321 taught by Professor Ceballos during the Spring '09 term at Texas State.

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Ch. 11 - Auditory+Perception - Psychophysics &...

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