Inharmonicity detection. Effects of age and contralateral distractor sounds

Area of Science:

• Auditory Neuroscience
• Psychoacoustics
• Gerontology

Background:

• Harmonicity perception is crucial for auditory scene analysis.
• Age-related changes in hearing sensitivity can impact complex sound processing.
• Inharmonicity detection is a key aspect of pitch perception.

Purpose of the Study:

• To investigate age-related differences in the detection of mistuned partials in complex tones.
• To examine the effect of contralateral distractor sounds on inharmonicity perception.
• To explore the neural mechanisms underlying age-related deficits in auditory perception.

Main Methods:

• Naïve subjects from three age groups participated.
• Complex tones with a 125-Hz fundamental frequency and ten harmonics were used.
• Mistuning detection thresholds for the first, second, fourth, and eighth harmonics were measured under monaural and dichotic conditions using a three-interval, three-alternative forced-choice procedure.

Main Results:

• Performance in detecting mistuned partials moderately deteriorated with age for higher harmonics (fourth and eighth).
• No significant age-related differences were found for lower harmonics (first and second).
• Dichotic signal/noise presentation did not yield significantly different thresholds compared to monaural presentation across all age groups.

Conclusions:

• Age-related decline in auditory perception affects the detection of inharmonicity, particularly for higher spectral components.
• Contralateral auditory distractor sounds do not significantly impair mistuning detection in this age range.
• Findings contribute to understanding auditory scene analysis and auditory deficits in patients with brain lesions.