![]() The idea is to broadcast specific series of vocalizations and then record the responses over time, this back and forth could someday both reveal what dolphins are "saying" and allow possible human-dolphin communication. Mishima and colleagues plan to work with such scientists using the new speaker. The dolphin speaker was developed just a few weeks ago, so dolphin scientists have not had a chance to try it out yet. ![]() "I am happy if we can communicate with dolphins using the dolphin speaker," researcher Yuka Mishima at the Tokyo University of Marine Science and Technology told LiveScience. Relatively few audio playback experiments have been attempted, since it is difficult to find speakers that can project from a wide range of low to high frequencies like dolphins do, said Heidi Harley, a comparative cognitive psychologist at New College of Florida in Sarasota, who wasn't involved in developing the dolphin speaker. With whistles, burst-pulse sounds and clicks, dolphins use sound not only to communicate and to scan their surroundings and prey in the dark sea (called echolocation).Īcoustic research of dolphins to date has mostly focused on recording their sounds and measuring their hearing abilities. In addition, dolphins not only can produce tones just as humans do, but they can also communicate at a variety of frequencies simultaneously. ![]() They can distinguish very small differences in the frequency or pitch of sound waves, and can hear and generate low-frequency sounds below 20 kilohertz that lie within human capabilities, as well as high-frequency sounds of up to more than 150 kilohertz, well beyond the range of our hearing. ![]() Dolphins live in a world of sound far beyond our own. ![]()
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