Individual Differences in Behavioural Decision Weights Related to Irregularities in Cochlear Mechanics

Area of Science:

• Auditory Neuroscience
• Psychoacoustics
• Otoacoustic Emissions

Background:

• Individual listening styles in spectral discrimination tasks are well-documented.
• These styles were previously attributed to attentional differences.
• Emerging evidence suggests cochlear micromechanics may also play a role.

Purpose of the Study:

• To investigate if otoacoustic emissions (OAEs) predict individual differences in auditory perception.
• To explore the relationship between spontaneous otoacoustic emissions (SOAEs) and stimulus-frequency otoacoustic emissions (SFOAEs) and tonal decision weights.

Main Methods:

• Participants performed a level discrimination task with tones presented near SOAEs or SFOAE maxima/minima.
• Decision weights for each tone were calculated.
• Correlations between OAE levels and relative decision weights were analyzed.

Main Results:

• Pilot data show a statistically significant correlation between OAE levels and relative decision weights.
• Tones near SOAEs or SFOAEs showed predictable weighting patterns.
• This suggests cochlear activity influences auditory decision-making.

Conclusions:

• Cochlear irregularities, evidenced by SOAEs and SFOAEs, likely contribute to individual listening styles.
• Otoacoustic emissions are potential biomarkers for auditory perception differences.
• Further research is warranted to confirm these findings and their implications for hearing research.