Author, Year, and Country	Aim	Result	Category of Analysis
Timmer, Launer & Hickson, 2020, Australia [22]	To describe research that has applied mobile applications at various stages of the adult rehabilitation process.	Mobile apps can provide practical information during the early stages of the patient experience and support for hearing aid management in the later stages. The usability of the app was rated positively by participants.	Telehealth and ICT Applications
Völter, Stöckmann, Schirmer, & Dazert, 2021, Germany [25]	To evaluate the feasibility of a new platform for teletherapy auditory rehabilitation in adults and to compare the clinical outcomes and economic benefits of this platform with those derived from conventional face-to-face rehabilitation settings.	The proposed teletherapy approach to auditory rehabilitation allows for good clinical outcomes while saving time for users and healthcare personnel.	Telehealth and ICT Applications
Hatzigiannakoglou & Okalidou, 2019, Greece [26]	To describe an auditory training software and demonstrate its usability in children.	The children with hearing loss were able to use the game successfully. This positive outcome supports the use of virtual reality and immersive technology as auditory training tools.	Telehealth and ICT Applications
Kwak, Kim, You & Han, 2020, Republic of Korea [27]	To develop a mobile healthcare application for elderly who suspect or know they have hearing loss, called Hearing Rehabilitation for Older Adults (HeRO).	There is a clear intention to use the healthcare application because seniors readily accept it and find it easy to manipulate.	Telehealth and ICT Applications
Paccola, Costa- Filho, & Jacob, 2021, Brazil [29]	To propose and validate a protocol for the electroacoustic verification of the FM system coupled to the bone conduction hearing aid.	The transparency criterion was achieved in all evaluated devices, but in some combinations, it was necessary to adjust the gain of the FM receiver above the manufacturer’s default setting. The proposed protocol was effective for electroacoustic verification of the FM system coupled to the bone conduction hearing aid.	Frequency-Modulated (FM) Systems
Oosthuizen, Picou, Pottas, Myburgh, & Swanepoel, 2021, Republic of South Africa [30]	To evaluate the effects of two intervention options, the Remote Microphone System (RMS) and the Contralateral Routing of Signal (CROS) system, in school-aged children with unilaterally limited hearing.	The RMS could be a beneficial technology option in classrooms for children with unilaterally limited hearing.	Frequency-Modulated (FM) Systems
Chen, Wang, Dong, Fu, Wang, & Wang, 2021, China [31]	To evaluate improvements in speech recognition capability in noisy environments as measured by the signal-to-noise ratio using wireless remote microphone-based technologies.	Technologies incorporating a wireless remote microphone can significantly improve speech recognition performance in challenging listening environments for Mandarin-speaking hearing aid users in China.	Frequency-Modulated (FM) Systems
Gabova, Meier, & Tavel, 2024, Czech Republic [33]	To explore parents’ experiences with Remote Microphone Systems (RMSs) for their children with hearing loss and to determine the advantages and disadvantages perceived by parents.	Parents listed the advantages of RMS for their children, themselves and other caregivers as improved hearing and comprehension, a life more like that of peers without hearing loss, road safety, reduced fatigue, vocabulary acquisition, and improved school performance. Some limitations were identified, such as low benefits, technical problems, and reluctance to use the device by children or teachers.	Frequency-Modulated (FM) Systems
Dhanjal & Singh, 2019, India [34]	To analyze various assistive technology tools and techniques for the hearing-impaired.	This article contributes to providing a common platform for research conducted by various researchers in multidimensional areas of assistive devices, including commercially viable devices available on the market.	Frequency-Modulated (FM) Systems
Scarinci, Nickbakht, Timmer, Ekberg, Cheng, & Hickson, 2022, Australia [36]	To explore the perceptions and experiences of hearing-impaired adults, their significant others, and healthcare personnel regarding the use and provision of Wireless Microphone Systems (WMSs).	The study results highlight the complexity of providing and using WMSs with hearing-impaired adults. Both significant others and healthcare professionals reported that, with the right experience, expectations, training, and support, wireless microphone systems can make a significant difference in listening and communication in different situations.	Frequency-Modulated (FM) Systems
Peralta & Piccolini 2022, Argentina [39]	To implement a system to measure the speed of sound propagation in water directly.	The implemented device was able to measure both speed and depth, but with a higher accuracy error than expected.	Vibrotactile Stimulators
Tufatulin, Koroleva, Artyushkin & Yanov, 2021, Russia [40]	To determine the limits of perception of underwater vibrotactile stimuli and to measure the effect of vibrostimulation training on auditory rehabilitation in young children.	Underwater vibrostimulation is a promising method of early auditory rehabilitation that could be recommended for implementation in pediatric audiology centers.	Vibrotactile Stimulators
Adler, Sanchez, Martini, Vartabedian, Zazzali, & Quintero-Rincon, 2020, Argentina [41]	To study the vibrations produced by a sound transmitted by bone conduction between a mobile phone and the hand, analyzed with the DSP Logger MX equipment.	This study clarified both the transmission quality, and the attenuation caused by the hand, facilitating the design of a future bone conduction communication device. With the results obtained, it is concluded that, in terms of sound transmission, a ring design would have lower power loss than a bracelet design since it decreases with distance.	Vibrotactile Stimulators
Guilleminot & Reichenbach, 2022, USA [42]	To demonstrate that the presentation of vibrotactile signals at syllabic rate can improve speech understanding in the presence of background noise.	Evidence is provided that this multisensory improvement in speech understanding reflects multisensory integration of auditory and tactile information in the auditory cortex.	Vibrotactile Stimulators
Lucia, Revuelta, Garcia, Ruiz, Vergaz, Cerdán, & Ortiz, 2020, Spain [43]	To explore an alternative method that uses vibrotactile stimulation as a possible channel to convey the emotional information contained in the audio section of a video and thus elicit a greater emotional reaction in hearing-impaired individuals.	The main result is that it shows that vibrotactile stimuli can generate activation of the cortex while watching a video, similar to sound.	Vibrotactile Stimulators
Abril-Linares, & Romero-Tellez, 2019, Colombia [44]	To implement an auditory sensory feedback system using bone conduction to deliver audio alerts about the status of a traffic light.	The individuals evaluated reported that the messages received through bone conduction were clear and concise.	Vibrotactile Stimulators