HST.723J/9.285J - Neural Coding and Perception of Sound

Spring 2008

Binaural Hearing Demonstrations

Auditory Demonstrations CD from the Acoustical Society of America

Lateralization and binaural beats

71. Binaural beats

72. Lateralization of pure tones based on interaural time differences (ITD)

73. Lateralization of clicks based on interaural time differences (ITD)

74. Lateralization of pure tones based on interaural level differences (ILD)

Note that lateralization based on ITD occurs for the 500-Hz tone and for clicks, but not for the 2000-Hz tone.  Lateralization based on ILD occurs at both 500 and 2000 Hz.

Binaural masking level differences (BMLD)

75. Sm: 500-Hz tone in quiet presented to the left ear

76. NmSm: 500 Hz tone in broadband noise, both presented to left ear

77. NoSm: Monaural 500-Hz tone in diotic noise

78. NoSo: Diotic 500-Hz tone in diotic noise

79. NoSpi: 500-Hz tone interaurally out of phase in diotic noise

Expected hierarchy of detection thresholds (lower is better): NoSpi < NoSm < NoSo ~ NmSm

Cocktail Party Effect Demonstrations from Richard Duda (1996)

10. Different talkers, diotic listening (both voices in both ears)

11. Different talkers,  dichotic listening (one voice in each ear)

12. Same talker, diotic listening

13. Same talker, dichotic listening

3. Stereophonic listening vs. monaural and diotic listening

Huggins Dichotic Pitch

1. A well known melody carried by Huggins pitch stimuli