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It was found that varying the number had a significant effect on the proportion of earcons identified. Reducing the number of concurrently presented earcons lead to a general increase in the proportion of presented earcons successfully identified. The second experiment investigated how modifying the earcons and their presentation, using techniques influenced by auditory scene analysis, affected earcon identification. It was found that both modifying the earcons such that each was presented with a unique timbre, and altering their presentation such that there was a 300 ms onset-to-onset time delay between each earcon were found to significantly increase identification. Guidelines were drawn from this work to assist future interface designers when incorporating concurrently presented earcons.<\/jats:p>","DOI":"10.1145\/1024083.1024087","type":"journal-article","created":{"date-parts":[[2005,8,1]],"date-time":"2005-08-01T17:33:57Z","timestamp":1122917637000},"page":"130-155","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":65,"title":["Understanding concurrent earcons"],"prefix":"10.1145","volume":"1","author":[{"given":"David K.","family":"McGookin","sequence":"first","affiliation":[{"name":"University of Glasgow, Glasgow, UK"}]},{"given":"Stephen A.","family":"Brewster","sequence":"additional","affiliation":[{"name":"University of Glasgow, Glasgow, UK"}]}],"member":"320","published-online":{"date-parts":[[2004,10]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"BBC News. 2002. Available at http:\/\/news.bbc.co.uk\/1\/hi\/sci\/tech\/1924144.stm. BBC News. 2002. 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