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Auditory Space Perception and Frequency Coding: Exploring Three Sensory Dimensions

Understand the sensations associated with sound - Pitch, Loudness, and Timbre. Explore how these psychological dimensions relate to the physical dimensions of Frequency, Amplitude, and Spectrum. Learn about Frequency theory and Place theory in auditory perception. Discover how auditory localization works through interaural delays and head-related sound shadowing.

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Auditory Space Perception and Frequency Coding: Exploring Three Sensory Dimensions

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  1. Frequency Coding And Auditory Space Perception

  2. Three primary dimensions of sensations associated with sounds with periodic waveforms Pitch, loudness and timbre. Pitch - sensation of "altitude" or "height" of a tone. Loudness - sensation of "intensity" of a tone. Timbre - quality of a sound.

  3. Psychological Dimension Associated Physical Dimension Pitch Frequency Loudness Amplitude Timbre Spectrum

  4. Historically, there have been two major approaches to frequency coding. Frequency theory (or timing) and Place theory - both focused on the basilar membrane

  5. Auditory Localization

  6. Interaural delays for three different sound directions

  7. Sound waves coming from the right side reach the right ear first, and there will be a large interaural delay before the sound propagates to the left ear.

  8. With high frequency sound the head will cast a sound shadow

  9. Slight asymmetries in arrival times between the two ears can be used to locate the lateral position of a stimulus. Delay lines and coincidence detectors may perform this computation.

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