Will diminishing cochlear delay affect speech perception in noise?

Area of Science:

• Auditory Neuroscience
• Speech Perception
• Signal Processing

Background:

• The auditory system naturally processes frequency information with inherent time/phase delays from the cochlea.
• These cochlear delays are critical for auditory processing, and their perturbation may impact speech recognition.

Purpose of the Study:

• To investigate the impact of diminishing or nullifying cochlear delays on speech recognition ability.
• To examine this effect on a timescale relevant to empirically demonstrated cochlear delays.

Main Methods:

• A randomized controlled trial tested word recognition using digitally processed speech tokens.
• Speech tokens were manipulated to alter cochlear delays (exacerbated, diminished/nullified).
• Listening conditions included speech-weighted noise with time-frequency reversed (no delay) versus non-reversed (natural timing) transforms.

Main Results:

• No statistically significant differences in word recognition were found between delay conditions across all speech token treatments.
• The algorithm designed to diminish cochlear delays did not systematically impair performance in all participants.

Conclusions:

• Perturbing frequency-dependent cochlear delays did not consistently degrade speech recognition under the tested conditions.
• Emerging trends suggest that altering cochlear delays might have subtle effects that warrant further investigation.