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Laughing hyenas, wailing levees, the sound of cheese and blaring bagpipes
Date:4/24/2009

That's the latest finding of evolutionary psychologist John Neuhoff and colleagues at The College of Wooster in Ohio, who study "looming" sounds. Participants in their study listened to a tone moving toward them and pressed a button when they thought the sound had arrived directly in front of them. Nearly everyone pushed the button too early, which Neuhoff interprets as an adaptation that helps human beings to anticipate and avoid danger.

The team also tested the fitness levels of the listeners and found that those better equipped to handle danger allowed the sound get closer. Individuals with greater upper body strength and/or stronger cardiovascular systems waited longer to push the button, while subjects in poorer physical shape gave themselves a greater "margin of safety."

The research expands upon previous work showing that women respond to looming sounds sooner than their typically larger, stronger male counterparts -- though both groups perceive receding sounds equally. Rhesus monkeys also spend less time looking at receding sounds than approaching sounds. "These reactions are influenced by evolutionary forces; it's a good thing to respond a little bit early and, evolutionarily, it doesn't cost much," says Neuhoff.

The talk "Strength and cardiovascular fitness predict time-to-arrival perception of looming sounds" (4aPP7) by John Nuehoff is at 11:00 a.m. on Thursday, May 21. Abstract: http://asa.aip.org/web2/asa/abstracts/search.may09/asa840.html


2) FISH THAT LIVE IN THE DARK HAVE THE BEST EARS

All fish have ears buried inside their heads. But fish that live in the deepest, darkest waters of the ocean may have particularly sensitive ears says Xiaohong Deng of the University of Maryland. She will be presenting the first anatomical evidence suggesting that some deep-sea fish have specialized structures to heighten thei
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Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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