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However, the details of vibrations in the anterior\u2013posterior direction (the so-called zipper-effect) and their correspondence with speech and other glottal signals are not fully understood due to challenges in direct measurements of vocal fold vibrations. In this proof-of-concept study, the potential of four parameters extracted from high-speed videoendoscopy (HSV), electroglottography, and speech signals to indicate the presence of a zipper-type glottal opening is investigated. Comparison with manual labeling of the HSV videos highlighted the importance of multiple parameter-signal pairs in indicating the presence of a zipper-type glottal opening.<\/jats:p>","DOI":"10.1121\/10.0001722","type":"journal-article","created":{"date-parts":[[2020,8,10]],"date-time":"2020-08-10T12:58:34Z","timestamp":1597064314000},"page":"EL141-EL146","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["Indicators of anterior\u2013posterior phase difference in glottal opening measured from natural production of vowels"],"prefix":"10.1121","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6641-2150","authenticated-orcid":false,"given":"Tiina","family":"Murtola","sequence":"first","affiliation":[{"name":"Department of Signal Processing and Acoustics, Aalto University , Espoo, Finland \u2008 tiina.murtola@aalto.fi , paavo.alku@aalto.fi"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paavo","family":"Alku","sequence":"additional","affiliation":[{"name":"Department of Signal Processing and Acoustics, Aalto University , Espoo, Finland \u2008 tiina.murtola@aalto.fi , paavo.alku@aalto.fi"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2020,8,10]]},"reference":[{"issue":"3","key":"2023080306002934500_c1","doi-asserted-by":"publisher","first-page":"596","DOI":"10.1109\/TASLP.2013.2294585","article-title":"Quasi closed phase glottal inverse filtering analysis with weighted linear prediction","volume":"22","year":"2014","journal-title":"IEEE\/ACM Trans. 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