Earing-impaired persons and also a normalhearing control group. For bone-conducted sound lateralization, Kaga et al. (2001) [14] located, using a selfrecording apparatus that measured ITD and ILD, that the abilities were maintained in several sufferers with VU0359595 Metabolic Enzyme/Protease bilateral microtia and aural atresia. Schmerber et al. (2005) [15] obtained time-intensity trading functions applying ITD and ILD in the same ear from patients with bilateral congenital aural atresia, and showed that time-intensity trading was present inside the sufferers. They concluded that a binaural fitting of BCHAs may optimize binaural hearing and enhance sound lateralization, and encouraged systematic bilateral fitting in aural atresia patients. Further advances in technologies have led towards the improvement of many types of BCDs aside from traditional BCHAs having a steel-spring headband or with framed glasses. Reinfeldt et al. (2015) [16] categorized these as traditional skin-drive BCDs, passive transcutaneous skin-drive BCDs, percutaneous direct-drive BCDs, and active transcutaneous direct-drive BCDs. Not too long ago, a non-surgical adhesive BCD has been made commercially readily available too [17]. Moreover, cartilage conduction hearing aids (CCHAs) have already been created by Hosoi et al. (2010) [18], devoid of the strong stress in the steel spring as employed in traditional BCHAs or surgical operations for BAHAs.Audiol. Res. 2021,So far, investigation on sound localization thus has been carried out applying the several kinds of devices talked about above. The majority of the research have reported that bilaterally Dielaidoylphosphatidylethanolamine manufacturer fitted devices showed additional enhanced sound localization than the unilaterally fitted ones. As the basis, Zeitooni et al. (2016) [19] investigated the effects of binaural hearing with bilateral BCHAs, measuring the spatial release from masking, the binaural intelligibility level difference, the binaural masking level distinction, and the precedence impact in adults with normal hearing. In all tests, the outcomes with bilateral BC stimulation in the BCHA position illustrated an ability to extract binaural cues related to BC stimulation in the mastoid position. They, on the other hand, did not test sound localization, the accuracy of which can be impacted by numerous aspects, for example the type of device, the participants, along with the experimental method. The present review aimed to talk about the aspects affecting sound localization or lateralization, too as their accuracy, for persons with bilateral (simulated) CHL using bilateral devices. For the initial aim, the elements affecting sound localization and lateralization had been classified, and also the relevant study is discussed. For the second aim, relating to the accuracy of sound localization and lateralization applying a multi-loudspeaker program, instead of a questionnaire like “The Speech, Spatial and Qualities of Hearing Scale (SSQ) [20], the clinical literature related to persons with hearing loss or normal hearing was searched on “Google Scholar”. The key phrases for this search have been “bone conduction”, “localization”, “bilateral”, and “conductive hearing loss” for sound localization, and “bone conduction”, “lateralization”, “bilateral”, and “conductive hearing loss” for sound lateralization. The search was performed for literature from 2012 to August 2021 for the reason that Janssen et al. (2012) [12] had currently reviewed the literature from 1977 to 2011. The method used to pick the literature for the second aim was as follows. First, the keyword search conditions in “Google Scholar” were set to e.