Right to Quiet Society Noiseletter
Fall 2013, page 2

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There has been a transformation in our relationship to the environment over the millions of years since the prototype for human hearing evolved, but part of our brain hasn’t registered the makeover.

Every time a siren shrieks on the street, our conscious minds might ignore it, but other brain regions behave as if that siren were a predator barrelling straight for us. Given how many sirens city dwellers are subject to over the course of an average day, and the attention-fracturing tension induced by loud sounds of every sort, it’s easy to see how sensitivity to noise, once an early warning system for approaching threats, has become a threat in itself.

Indeed, our capacity to tune out noises — a relatively recent adaptation — may itself pose a danger, since it allows us to neglect the physical damage that noise invariably wreaks. A Hyena (Hypertension and Exposure to Noise Near Airports) study published in 2009 examined the effects of aircraft noise on sleeping subjects. The idea was to see what effect noise had, not only on those awakened by virtual fingernails raking the blackboard of the night sky, but on the hardy souls who actually slept through the thunder of overhead jets.

The findings were clear: even when people stayed asleep, the noise of planes taking off and landing caused blood pres-sure spikes, increased pulse rates and set off vasoconstriction and the release of stress hormones. Worse, these harmful cardiovascular responses continued to affect individuals for many hours after they had awakened and gone on with their days.

As Dr. Wolfgang Babisch, a lead researcher in the field, observed, there is no physiological habituation to noise. The stress of audible assault affects us psychologically even when we don’t consciously register noise.

In American culture, we tend to regard sensitivity to noise as a sign of weakness or killjoy prudery. To those who complain about sound levels on the streets, inside their homes and across a swath of public spaces like stadiums, beaches and parks, we say: “Suck it up. Relax and have a good time.” But the scientific evidence shows that loud sound is physically debilitating. A recent World Health Organization report on the burden of disease from environmental noise conservatively estimates that Western Europeans lose more than one million healthy life years annually as a consequence of noise-related disability and disease. Among environmental hazards, only air pollution causes more damage.

A while back, I was interviewed on a call-in radio station serving remote parts of Newfoundland. One caller lived in a village with just a few houses and almost no vehicular traffic. Her family had been sitting in the living room one evening when the power suddenly cut off. They simultaneously exhaled a sigh of relief. All at once, the many electronic devices around them (including the refrigerator, computers, generator, lamps and home entertainment systems and the unnatural ambient hum they generated and to which the family had become oblivious) went silent. The family members didn’t realize until the sound went off how loud it had become. Without knowing it, each family member’s mental energy was constantly diverted by and responsive to the threat posed by that sound.

Where does this leave those of us facing less restrained barrages? Could a critical mass of sound one day be reached that would make sustained thinking impossible?

Is quiet a precondition of democracy? The Supreme Court justice Felix Frankfurter suggested it might just be. “The men whose labours brought forth the Constitution of the United States had the street outside Independence Hall covered with earth so that their deliberations might not be disturbed by passing traffic,” he once wrote. “Our democracy presupposes the deliberative process as a condition of thought and of responsible choice by the electorate.”

The quiet in Independence Hall was not the silence of a monastic retreat, but one that encouraged listening to others and collaborative statesmanship; it was a silence that made them more receptive to the sound of the world around them.

Most likely Schopenhauer had in mind a similar sense of quiet when he chose to live in a big city rather than retiring from society: apparently he, too, believed it important to observe as much of life as possible. And when he moved to Frankfurt, he didn’t bring earplugs. He brought along a poodle known to bark on occasion, and the flute he loved to play after writing. Most people who are seeking more serenity from the acoustical environment aren’t asking for the silence of the tomb. We just believe we should be able to hear ourselves think.

George Prochnik is the author of the forthcoming book “The Impossible Exile.”

Researchers in Germany had more than 100 people record their heart activity over several 6-hour spans. They also recorded surrounding noise levels. The sounds were classified as either above or below a threshold of 65 decibels, which is the level of a normal conversation. The corresponding heart activity was then analysed. According to the results, the heart's ability to adapt to acute events was affected by as little as a 5 decibel increase in exposure no matter what level the noise started at. The researchers say their findings show that noise at low levels may be just as harmful to your health as noise at high levels. By Health Day

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