Responses to dichotic tone-in-noise stimuli in the inferior colliculus
Human listeners are more sensitive to tones embedded in diotic noise when the tones are out-of-phase at the two ears (N S ) than when they are in-phase (N S ). The difference between the tone-detection thresholds for these two conditions is referred to as the binaural masking level difference (BMLD)...
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Veröffentlicht in: | Frontiers in neuroscience 2022-12, Vol.16, p.997656-997656 |
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Sprache: | eng |
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Zusammenfassung: | Human listeners are more sensitive to tones embedded in diotic noise when the tones are out-of-phase at the two ears (N
S
) than when they are in-phase (N
S
). The difference between the tone-detection thresholds for these two conditions is referred to as the binaural masking level difference (BMLD) and reflects a benefit of binaural processing. Detection in the N
S
condition has been explained in modeling studies by changes in interaural correlation (IAC), but this model has only been directly tested physiologically for low frequencies. Here, the IAC-based hypothesis for binaural detection was examined across a wide range of frequencies and masker levels using recordings in the awake rabbit inferior colliculus (IC). IAC-based cues were strongly correlated with neural responses to N
S
stimuli. Additionally, average rate-based thresholds were calculated for both N
S
and N
S
conditions. The rate-based neural BMLD at 500 Hz matched rabbit behavioral data, but the trend of neural BMLDs across frequency differed from that of humans. |
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ISSN: | 1662-4548 1662-453X 1662-453X |
DOI: | 10.3389/fnins.2022.997656 |