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However, little is known about longer-latency cortical AEPs despite their relevance for understanding echo processing and auditory stream segregation. Here, we used a non-invasive AEP setup with low click repetition rates on a trained harbor porpoise to test the long-standing hypothesis that echo information from distant targets is completely processed before the next click is emitted. We reject this hypothesis by finding reliable click-related AEP peaks with latencies of 90 and 160\u2009ms, which are longer than 99% of click intervals used by echolocating porpoises, demonstrating that some higher-order echo processing continues well after the next click emission even during slow clicking. We propose that some of the echo information, such as range to evasive prey, is used to guide vocal-motor responses within 50\u2013100\u2009ms, but that information used for discrimination and auditory scene analysis is processed more slowly, integrating information over many click-echo pairs. We conclude by showing theoretically that the identified long-latency AEPs may enable hearing sensitivity measurements at frequencies ten times lower than current ABR methods.<\/jats:p>","DOI":"10.1121\/10.0017163","type":"journal-article","created":{"date-parts":[[2023,2,7]],"date-time":"2023-02-07T13:28:05Z","timestamp":1675776485000},"page":"952-960","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Latencies of click-evoked auditory responses in a harbor porpoise exceed the time interval between subsequent echolocation clicks"],"prefix":"10.1121","volume":"153","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5699-0849","authenticated-orcid":false,"given":"K.","family":"Beedholm","sequence":"first","affiliation":[{"name":"Zoophysiology, Department of Biology, Aarhus University 1 , Aarhus C 8000, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7559-9271","authenticated-orcid":false,"given":"M.","family":"Ladegaard","sequence":"additional","affiliation":[{"name":"Zoophysiology, Department of Biology, Aarhus University 1 , Aarhus C 8000, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5208-5259","authenticated-orcid":false,"given":"P. 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