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The stimuli were spatialized using the head-related impulse responses recorded from behind-the-ear microphones of hearing aids. The results showed that simulated users of bilateral CIs displayed binaural benefits (i.e., binaural summation and binaural squelch) in the maskers with pure energetic masking or with additional modulation masking but not in the masker with primarily language-based informational masking. Binaural benefits observed in the simulation did not consistently agree with the findings in real CI users. The use of SPIRAL vocoder allows further parameterization research into pinning down the factors that affect binaural benefits in bilateral CIs.<\/jats:p>","DOI":"10.1121\/10.0039099","type":"journal-article","created":{"date-parts":[[2025,9,2]],"date-time":"2025-09-02T15:22:34Z","timestamp":1756826554000},"page":"1653-1662","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Simulation of unilateral and bilateral cochlear implants on spatial speech-in-noise tasks"],"prefix":"10.1121","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7361-9969","authenticated-orcid":false,"given":"Mengchao","family":"Zhang","sequence":"first","affiliation":[{"name":"Audiology Department, College of Health and Life Sciences, Aston University , Birmingham, B4 7ET,","place":["United Kingdom"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christine","family":"du Plessis","sequence":"additional","affiliation":[{"name":"Audiology Department, College of Health and Life Sciences, Aston University , Birmingham, B4 7ET,","place":["United Kingdom"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2025,9,2]]},"reference":[{"issue":"3","key":"2025090211222620300_c1","doi-asserted-by":"publisher","first-page":"699","DOI":"10.1121\/1.1913381","article-title":"Dichotic speech perception: An interpretation of right-ear advantage and temporal offset effects","volume":"53","year":"1973","journal-title":"J. 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