Speaking More Clearly Comes at a Cost: Study Finds Clear Speech Sounds Less Natural to Listeners

New research shows that when talkers slow down and enunciate for listeners with hearing loss, their speech becomes clearer but is judged noticeably less natural, revealing a trade-off in everyday communication.

"Speak slowly and clearly" is probably the most common piece of advice given to families of people with hearing loss. Communication partners are routinely coached to enunciate, pause more, and stretch out their words so that a spouse or parent with hearing difficulty can follow the conversation.

A new study from Hofstra University asks a question that this advice usually skips over: what does all that careful enunciation sound like to everyone else? The answer turns out to be complicated, and it has real implications for how families communicate day to day.

Background: Why the Researchers Looked at This

Clear speech is a recognized communication technique in which a talker deliberately slows down, pauses more often, and articulates more precisely. Decades of research show it genuinely improves intelligibility for listeners with hearing loss, which is why clinicians teach it to communication partners.

But speech that is easier to understand is not automatically pleasant to produce or hear. Naturalness refers to how typical and effortless speech sounds to an ordinary listener. If clear speech sounds strained or robotic, talkers may be reluctant to keep using it, and listeners may feel spoken down to.

Shuminsky and Davidow wanted to measure this trade-off directly: how much naturalness is lost when people adopt clear speech, both spontaneously and after formal training?

How the Study Was Done

Twelve adult female talkers read sentences in three conditions: their habitual everyday speech, untrained clear speech produced simply by being asked to speak clearly, and trained clear speech produced after a brief 30-minute training session.

Twenty-eight adults with normal hearing then rated the naturalness of these recordings on a 1-to-9 scale, where lower numbers meant more natural. The researchers also measured speech rate, the number of pauses, and pause durations, and used statistical models to test how the conditions differed and which acoustic features predicted naturalness ratings.

What the Researchers Found

Habitual speech was rated most natural, with an average score of 3.56, and was spoken fastest at 3.89 syllables per second. Trained clear speech was rated least natural at 5.65 and was dramatically slower at 1.72 syllables per second, less than half the habitual rate, with the most pauses and the longest pauses.

Untrained clear speech landed in between. In fact, nearly every pairwise comparison between the three conditions was statistically significant, meaning each step toward more deliberate clarity produced a measurable drop in perceived naturalness.

Speech rate was the strongest predictor of naturalness ratings: the slower the speech, the less natural it sounded. More frequent and longer pauses were also associated with lower naturalness, although the researchers note these features did not fully explain why trained clear speech sounded least natural.

The team also observed substantial variability between talkers, both in their baseline speech and in how much they changed when shifting to clear speech, and listeners varied considerably in their ratings too.

What It Means for People with Hearing Loss

This study puts numbers on something many families sense intuitively: conversation changes character when one partner has hearing loss. The very techniques that make speech easier to follow also make it sound slower, choppier, and less like a normal exchange between equals.

The authors suggest clinical protocols should promote clarity techniques that avoid excessive slowing or disrupted rhythm, possibly with real-time feedback during training. For families, the message is not to abandon clear speech, which genuinely helps, but to recognize that leaning entirely on the talker carries a social cost for both sides.

The findings also strengthen the case for addressing hearing loss at the listener's end. The less work a listener's ears require from every conversation partner, the more natural everyday conversation can remain.

When Speech Clarity Comes from the Device Instead of the Talker

Because this study shows that pushing all the clarity work onto talkers makes conversation sound less natural, technology that improves speech clarity at the listener’s ear carries some of that load instead. Newer FDA-OTC hearing aids are built around exactly this goal, and Panda Quantum is one such device: a 16-channel receiver-in-canal aid with adaptive noise reduction designed for clearer speech in noisy environments, so conversation partners do not have to slow their speech to half its normal pace to be understood.

Quantum also offers an optional app-based in-ear hearing test that can personalize gain and frequency response to your hearing profile, though the aid works without the app or the test. A single charge runs 20 hours, the case adds three more full charges for 80 hours total, and Bluetooth connects calls, TV, and music. It carries a 5-year warranty and a 45-day trial that starts when you receive it. Details are at pandahearing.com/products/panda-hearing-aids-quantum.

As always, OTC hearing aids are approved for mild-to-moderate hearing loss; severe or profound loss still benefits most from a clinical fitting.

Limitations of This Research

The talker group was small, twelve adults, and all female, so results may not generalize to male voices or older talkers. Naturalness was judged by normal-hearing listeners rather than listeners with hearing loss, and the study measured perception in a laboratory rather than benefit in real conversations. The abstract does not disclose funding sources or conflicts of interest.

Where This Leaves Us

Clear speech remains a valuable, evidence-backed tool, but this study confirms it is not free: clarity gained is naturalness lost. The most comfortable conversations likely come from meeting in the middle, with talkers using moderate clarity techniques and listeners getting the hearing support they need, so that neither side has to carry the whole burden of being understood.

Shuminsky P, Davidow JH. Perceived Naturalness and Acoustic Characteristics of Habitual Versus Clear Speech for Individuals With Hearing Loss. Journal of Speech, Language, and Hearing Research. 2026. Retrieved from PubMed. https://doi.org/10.1044/2026_JSLHR-25-00691