Event-Related Potentials as Markers of Age-Related Changes of Spatial Hearing in Normal-Hearing Adults.

Spatial auditory performance decreased with age even when audiometric thresholds were within normal limits.

• The study used a spatial oddball paradigm to assess spatial sensitivity across age groups.
• Participants were selected based on clinically normal audiometric thresholds, excluding presbycusis.
• Decline in spatial auditory performance was observed across age in the normal-hearing population.
• The findings suggest auditory aging without hearing impairment can still result in a decline in spatial sensitivity.

Speech in noise comprehension declined with age in normal-hearing adults.

• Speech in noise comprehension was assessed as part of the study measures alongside spatial hearing.
• Decline was observed across age even when audiometric thresholds were normal.
• This decline is consistent with deterioration of key binaural functions including binaural summation, squelch effect, and head shadow effect.

Cognitive status declined across age in the normal-hearing adult population studied.

• Cognitive status was measured as part of the study's outcome measures.
• Decline was noted across age groups even in the absence of abnormal audiometric thresholds.
• Cognitive status was evaluated alongside auditory spatial and speech-in-noise performance.

N100 amplitudes showed a strong correlation with age in normal-hearing adults.

• EEG was used to record Event-Related Potentials (ERPs) using a spatial oddball paradigm.
• N100 is an ERP component associated with auditory processing and spatial sensitivity.
• The correlation between N100 amplitudes and age was described as 'strong'.
• This finding held in participants without abnormal audiometric thresholds.

N100 amplitudes correlated with the binaural unmasking function across participants.

• The unmasking function reflects binaural integration, specifically the ability to detect signals in noise using binaural cues.
• A correlation was found between N100 amplitudes and the unmasking function.
• This association links the neural ERP marker (N100) to a behaviorally relevant binaural measure.
• The findings support N100 as a neurophysiological marker of binaural spatial hearing performance.

ERP components, particularly N100, are proposed as valid markers of spatial hearing performance and aging.

• The study used a spatial oddball paradigm to elicit and examine neural components associated with spatial sensitivity.
• The authors conclude that ERP components 'underscore the validity of ERP components as markers of spatial hearing performance and aging.'
• The authors suggest these markers could orient clinical decision-making regarding the necessity for hearing rehabilitation.
• The goal is to prevent auditory aging consequences on both peripheral and central auditory processing.

Most existing research on spatial hearing in aging focuses on elderly individuals with hearing impairments rather than those with clinically normal hearing.

• The authors identified a gap in the literature where spatial hearing aging in normal-hearing populations is underexplored.
• Prior studies have shown older adults can experience a decline in spatial auditory cue integration without pathological audiometric thresholds.
• The current study specifically targeted adults without abnormal audiometric thresholds to address this gap.