![]() In fact the informational characteristics of calls remained uncompromised until the signal became inaudible. The team found that although the quality of the signal may have degraded, the content of the signal was still intact - even at long distance. The results are revealed in the study: Orangutan information broadcast via consonant-like and vowel-like calls breaches mathematical models of linguistic evolution published today in Biology Letters. The quality and content of the signals received were analysed. Specific consonant-like and vowel-like signals were played out and re-recorded across the rainforest at set distances of 25, 50, 75 and 100 metres. They selected a range of sounds from previously collected audio recordings of orangutan communications. Researchers from the University of Warwick's Department of Psychology set out to collect empirical data to investigate the model. Because signal quality degrades over larger distances, it is proposed that human ancestors started linking sounds together to effectively convey a package of information even if it is distorted. The currently accepted model, developed by mathematicians, predicts that human ancestors strung sounds together in their calls in order to increase their chances of carrying a signal's content to a recipient over distance. ![]()
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