DIY Builds
DIY Builds
Photo: MART PRODUCTION
So, for example, from the human audiogram you can see that people hear pretty well at 1,000Hz; here, the threshold of hearing is a scant 2 decibels. For rats, however, the threshold is more like 24dB. That means that a 20dB sound at 1,000Hz would be easily audible to you but would be entirely inaudible to the rodent.
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Snakes enter a building because they're lured in by dark, damp, cool areas or in search of small animals, like rats and mice, for food. Snakes can...
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These are! They guide you every step of the way to complete your dream shed.
Learn More »The plot above is called an audiogram: it describes the threshold of hearing. I’ve plotted humans (from an ISO standard) and a particular rat (from Rickye Heffner's fantastic archive of mammalian hearing data). The figure is really simple to read: each point on the curve tells you the quietest sound that the animal can hear at different frequencies. So, for example, from the human audiogram you can see that people hear pretty well at 1,000Hz; here, the threshold of hearing is a scant 2 decibels. For rats, however, the threshold is more like 24dB. That means that a 20dB sound at 1,000Hz would be easily audible to you but would be entirely inaudible to the rodent. The very top end of human hearing, commonly taken to be 20,000Hz (which most people can't truly hear, anyway), is comfortably in the middle of the rat's hearing range, which stretches from a few hundred Hertz up to perhaps 70,000Hz. One way that we could get a handle on rodent hearing would be to try to find some sort of “exchange rate” between the human and rat audiograms. It’s true that for much of the spectrum, humans appear to have better hearing than rats: you might notice that the lowest point on the human audiogram is actually below the lowest points on the rat audiogram. But this difference is not especially meaningful from our perspective: it’s a modest difference, and thresholds themselves don’t tell us much about what kinds of amplitudes might be annoying or painful, anyway. Instead, the more important difference is frequency. And here is where my proposed exchange rate comes in. Forgive my poor web-animation capabilities; I’m going to show this in two parts. First, let’s separate out the x-axis (frequency) on the audiogram, so that we can keep an eye on what we're doing:
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