Lecture 11 - Higher Auditory Perception

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Lecture 11 - Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Audibility Function (AF)

• sensitivity vs. frequency
• range of audible frequencies
• note threshold minimum detection amplitude

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Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Loudness Perception

• perceived loudness depends on frequency
• equal loudness contours
• magnitude estimation
• power law
• neural encoding of loudness
• beats
• loudness modulation

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• slide 12 - see textbook Fig. 10.23

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Loudness Perception

• Beats
• variations in loudness over time
• change in relative phase over time
• need 2 close frequencies

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Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Frequency Discrimination

• frequency tuning curves
• increase in firing to increase in loudness
• increase in firing to characteristic frequency
• noise masking
• bandpass filters
• threshold elevation
• binaural unmasking

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Frequency Discrimination

• Frequency Sharpening
• lateral inhibition

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• slide 20 - see textbook Fig. 10.25

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Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Pitch Perception

• pitch vs. frequency
• pitch is the perceptual quality associated with
  frequency
• harmonics
• multiples of a fundamental frequency
• timbre
• unique harmonic pattern associated with a musical
  instrument

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Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Speech Perception

• phoneme
• unit of speech (speech sound unit)
• e.g. /d/ /p/
• (i.e. written this way, refers to the sound the
  letter makes)

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Speech Perception

• spectrogram
• frequency pattern over time
• neural responses to speech sounds
• feature detectors for speech
• perceived boundaries of speech
• sentence boundaries
• word boundaries

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Speech Perception

• Context Effects
• Marzi doats n doze edoats n lidul lamzey divey
• meaning provides boundary cues
• Ladle Rat Rotten Hut
• misleading spelling affects perception

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Higher Auditory Perception

• Audibility Function (AF)
• Loudness Perception
• Frequency Discrimination
• Pitch Perception
• Speech Perception
• Hearing Loss

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Hearing Loss

• conduction loss
• sensory/neural loss
• speech sounds
• high frequency loss

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Hearing Loss

• conduction loss
• outer or middle ear
• problems in mechanical transmission
• sensory/neural loss
• inner ear or auditory cortex
• may be frequency-specific
• presbycusis

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Hearing Loss

• temporary damage to inner ear
• aspirin
• nicotine
• speech sounds
• high frequency loss
• could make /s/ and /f/ inaudible

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Sound Localization (contd)
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