Whales Adjust Their Hearing Sensitivity

60-Second Science | More Science

When warned of a loud noise, a false killer whale reduced its hearing sensitivity in anticipation of the sound. Sophie Bushwick reports

May 15, 2012

More 60-Second Science

Subscribe via iTunes

How does a Venus flytrap know when to snap shut? Can it actually feel an insect?s tiny, spindly legs? And how do cherry blossoms know when to bloom? Can they...

Read More??

Have you ever wanted to turn down the volume at a deafening concert or noisy bar? Envy the whale: a new study finds that toothed whales can reduce their own auditory sensitivity when they expect a loud sound. The work is presented at this week?s Acoustics 2012 meeting. [Paul E. Nachtigall and Alexander Ya Supin, "Immediate changes in whale hearing sensitivity"]

Whales and dolphins rely on their responsive hearing to interpret returning echolocation clicks. Previous research suggested that these marine mammals could dull their hearing before uttering outgoing echolocation clicks, which are very loud. Could they use the same coping mechanism for external noises?

To find out, researchers trained a false killer whale that a loud noise would always follow a brief warning signal. Then, they attached suction-cup sensors to the outside of the whale?s head and played the signal. The sensors measured brainwaves that indicated the whale did reduce its hearing sensitivity in expectation of a clamor. The researchers hope to test other species as well.

Loud noises from ships can disturb whales. To accommodate marine life, perhaps vessels could emit signals before making a ruckus, warning whales to tune us out.

?Sophie Bushwick

[The above text is a transcript of this podcast.]

rachel crow rachel crow steelers browns va tech dan gilbert david stern david stern