Functional hearing loss and its relationship to resolved hearing levels.

Area of Science:

• Audiology
• Auditory Neuroscience
• Psychophysics

Background:

• Functional hearing loss, characterized by exaggerated hearing thresholds, presents diagnostic challenges.
• Understanding the nature of nonorganic hearing components is crucial for accurate audiological assessment.

Purpose of the Study:

• To retrospectively investigate the characteristics of functional hearing loss in adults.
• To determine the relationship between functional hearing loss components and actual hearing sensitivity.

Main Methods:

• Retrospective analysis of 63 adults with bilateral exaggerated hearing losses (126 ears).
• Examination of hearing sensitivity after resolution of nonorganic components.
• Analysis of the configuration and size of functional components relative to resolved hearing levels.

Main Results:

• The configuration of functional hearing loss correlated with resolved hearing levels.
• Functional overlay size was consistent across frequencies for normal or mild hearing losses.
• In high-frequency losses, the functional overlay was smaller at impaired frequencies.
• Moderate to severe losses showed a gradual decrease in functional overlay with increasing frequency.
• Nonorganic overlays were consistent with actual hearing levels in ears with differing hearing statuses.

Conclusions:

• Findings suggest individuals with functional hearing loss utilize an internalized loudness-based anchor.
• Test signals must reach a perceived loudness anchor at each frequency to elicit an exaggerated threshold response.
• Pure-tone audiometric configuration and functional hearing loss amount can be explained by auditory factors.