Foundations of Auditory Rehabilitation

01What is this guide for?

An audiologist who has just started working in the field of special education and rehabilitation almost always asks the same question in the first few weeks: "There is a child with a device sitting in front of me — what exactly am I going to do in the session?" The answer to that question is in fact hidden in the answers to three questions that come before it: What exactly does auditory rehabilitation target? Through which theoretical framework is that target approached? And on what legal basis is this work carried out in Türkiye?

This page is the theoretical introduction to the Auditory Rehabilitation section. The other sub-guides (the Erber hierarchy, Ling 6, session planning, IEP goals, family guidance) build on the framework set out here. By the end you will not find the answer to "what am I going to do", but you will find the grounding you need in order to produce that answer for yourself.

02What is auditory rehabilitation?

Hearing aids and cochlear implants convert the acoustic signal into a form that the auditory system can use. But technology transmits sound; it does not teach comprehension. A child who has been appropriately fitted receives sound, but does not spontaneously know what that sound means, which sound to attend to and which to ignore, or how to follow speech in noise. Auditory rehabilitation begins where technology ends.

Definition. Auditory rehabilitation is an assessment-based, goal-directed, planned and regularly monitored intervention process that aims to enable a person with hearing loss to make the fullest possible use of their — technology-supported — hearing for communication (Tye-Murray, 2020).

This definition has four components, and all four are part of the process:

Auditory skills. Detection, discrimination, identification and comprehension of sound; listening in noise; localisation. This is the core of the section, but it is not the whole of it.

Language and speech. Hearing is the input channel for language. As listening skills develop, so do vocabulary, grammar and speech production; the reverse also holds. For this reason, auditory work cannot be carried out in isolation from language goals.

Communication and participation. The aim is not to give the correct answer on a test; it is for the child to hear the teacher in class and to be able to set up play with peers, and for the adult to be able to follow the conversation in a meeting. Communication strategies, psychosocial adjustment and self-advocacy also fall under this heading.

Family, environment and technology management. One or two hours of sessions a week is a small slice next to the hundreds of hours the child spends awake. What determines the gains is as much what happens at home and in the classroom as what happens in the session room. Making sure the device is in working order every day is also part of this heading.

Habilitation or rehabilitation?

In Turkish, "işitsel rehabilitasyon" is commonly used for both situations, but the distinction should be known, because it has a direct effect on goals:

Prelingual hearing loss. The hearing loss is present before the child acquires language. Here there is no skill being restored; the skill is being established for the first time. The technically correct term is habilitation. The aim is to build listening and language by following the typical developmental steps.

Postlingual hearing loss. The person acquired language through hearing and the loss developed later. There are established representations of speech sounds in the brain; the task is to re-map those representations onto the changed signal. Here the term rehabilitation is the appropriate one.

The practical consequence is this: you do not work with a two-year-old with an implant and a fifty-five-year-old with an implant on the same logic. In the one, language is built; in the other, existing language is adapted to a new signal.

This is teamwork

Auditory rehabilitation is not the monopoly of a single profession. The audiologist handles device performance and auditory skills; the speech and language therapist, language and speech development; the special education teacher, the educational process; the ENT specialist, the medical side. The family's role, meanwhile, is not "supportive" but directly decisive.

The position of the audiologist working in a special education and rehabilitation centre is distinctive here: they are often both the person who verifies that the device is genuinely working and the person who sets the auditory goals. These two tasks must not be separated from one another — because even the best session plan is wasted on a child whose device has not been verified.

03Why and when? Neuroplasticity and hearing age

To understand the urgency of auditory rehabilitation, it is enough to grasp a single fact: the central part of the auditory system cannot complete its maturation unless it is stimulated, and this maturation has a time window.

The critical (sensitive) period

The maturation of the central auditory pathways can be tracked through the cortical auditory evoked potential (CAEP) P1 wave response. P1 latency shortens systematically with age; this shortening is interpreted as an indication that the pathways have reached maturation through auditory experience, and P1 is therefore used as a biomarker for this maturation (Sharma, Dorman & Spahr, 2002).

Studies in implanted children with congenital hearing loss reveal a consistent picture:

• Children stimulated with an implant before approximately 3.5 years of age show P1 latencies that enter the normal range within the first six months of implant use.
• Children stimulated after approximately 7 years of age show latencies that remain abnormal even after years of implant use.
• The range between 3.5 and 7 years of age is a transition zone; outcomes are variable.

These findings point to a critical (sensitive) period of approximately 3.5 years for the development of the central auditory system, and indicate that the window largely closes around the age of 7 (Sharma, Nash & Dorman, 2009).

Why does the window close? An auditory cortex that receives no auditory input for a long time does not remain idle: the visual and somatosensory systems begin to use this area. Cross-modal reorganisation is the name given to this process, which has been reported to mean a reduction in the resources allocated to auditory processing in the late-stimulated system (Kral & Sharma, 2012).

The 1-3-6 rule

This timetable of neuroplasticity explains why early identification systems set such sharp targets. The international benchmark is known as the 1-3-6 rule: 1. month's end: hearing screening, 3. month's end: confirmation of the diagnosis, 6. month's end: the start of intervention (Joint Committee on Infant Hearing, 2019).

These dates are not arbitrary; every delay spends from the fixed budget of the critical (sensitive) period.

Hearing age

One of the most useful concepts in the clinic is hearing age, also called listening age: the time counted from the moment the hearing aid or implant began to be used effectively onwards.

If a three-year-old child's implant was activated at the age of one, the child's chronological age is 3, hearing age is 2.

This distinction has three practical consequences:

It calibrates expectations. A child's listening and language skills are evaluated according to hearing age, not chronological age. A child with a hearing age of 6 months is not expected to have the language level of a three-year-old.

It calibrates the goals. Session goals are selected from the developmental step corresponding to the hearing age.

But it does not permit complacency. If the child is expected to catch up with their peers, progressing at the typical rate of development is not enough — the child must progress faster. Hearing age is not an excuse that explains the delay, but a measure that determines intensity.

A caveat: hearing age refers to the period during which the device was working and appropriately fitted for the child. Six months spent with a device that is worn two hours a day and whose settings have not been verified does not count as six months of hearing age. This is why device use data (datalogging) is valuable.

04Theoretical approaches

The route by which a child with hearing loss will establish communication is the most debated question in the field. The audiologist's task here is not to take sides, but to know the approaches accurately and to help the family make an informed choice.

The auditory-verbal approach (AVT) and LSL

Auditory-Verbal Therapy (AVT), which regards hearing as the primary sensory channel and aims to establish spoken language through listening, is a family-centred intervention approach. The broader umbrella term is the listening and spoken language (LSL) approach (Estabrooks, MacIver-Lux & Rhoades, 2016).

The defining feature of AVT is not so much its techniques as its structure: the therapist works largely with the family rather than with the child. In the session there is not a therapist observing the parent, but a parent observing the therapist; the parent sees the strategies they will apply at home modelled in the session.

The 10 principles, defined by the AG Bell Academy, frame the practice (AG Bell Academy for Listening and Spoken Language, 2007/2024). In summary:

1. Promoting early diagnosis and, immediately thereafter, audiological management together with AVT
2. Prompt assessment and use of appropriate, up-to-date hearing technology
3. Guiding and coaching the family so that they help the child use hearing as the primary sense (family guidance)
4. The family becoming, through active and regular participation in individual AVT sessions, the primary facilitator of the child's listening and spoken language development
5. The family creating environments that support listening throughout daily activities
6. The family integrating listening and spoken language into all areas of the child's life
7. The family using the natural developmental patterns of hearing, speech, language, cognition and communication
8. The family helping the child to self-monitor by listening to their own speech
9. Carrying out ongoing assessment in order to develop individual plans, monitor progress and evaluate the effectiveness of the plan
10. Supporting education in an inclusive setting with typically hearing peers

These principles are applied as a whole; according to the AG Bell Academy, all 10 principles are required for a practice to count as "auditory-verbal". Internationally, practitioners are identified by LSLS certification (Cert. AVT / Cert. AVEd). In Türkiye the number of certified specialists is very small; this is no obstacle to knowing and applying the principles.

Other approaches

Total Communication. This is an approach in which sign, natural gesture, fingerspelling, lip-reading, speech and listening are used together. The aim is to support communication by every available route. The problem observed in practice is this: settings described as "every route open" can in practice turn largely into signing environments, and the time devoted to listening can remain less than expected.

The bilingual-bicultural approach. It treats sign language as the first language and written/spoken language as the second, and it values belonging to Deaf culture. For hearing families who choose this approach, it is critically important that they learn sign language themselves and ensure that the child regularly meets people who use the language fluently.

Where does the audiologist stand in this debate?

Three principles make the task easier:

The choice of approach belongs to the family. Presenting the information completely and without bias is the professional's job; the decision belongs to the family.

Whichever approach is chosen, language input must be early and rich. This is the point on which there is the broadest consensus: regardless of which language it is, the child must be exposed to a complete and accessible language in the early period.

Device performance matters in every approach. A child who uses sign language also needs their device to be working. The sentence "they communicate by signing, so the device is not that important" cannot be defended clinically.

In Türkiye, in the Language Education module of the MEB support education programme, the Alternative Communication shows that the official framework, too, does not impose a single approach (MEB, 2021).

05The framework of auditory development: the Erber hierarchy

The common language of auditory rehabilitation is the four-stage model Norman Erber described in 1982 (Erber, 1982). For more than forty years it has continued to be the skeleton of the field, because it places both assessment and goal selection within the same framework.

Detection. Perceiving whether or not a sound is present. The answer to the question "Did you hear it?" The child gives a conditioned response to sound: when they hear it, they drop the block into the box.

Discrimination. Being able to say whether two stimuli are the same or different. Here you do not need to know what the sound is; you only need to perceive the difference. "Are these two the same or different?"

Identification. Being able to label the sound or word that is heard: pointing, repeating, writing. "What did you hear?" It begins in a closed set (from among given options) and moves towards an open set (with no options given).

Comprehension. Being able to give meaning to what is heard and produce an appropriate response: carrying out an instruction, answering a question, sustaining a conversation. "What did they mean?" This is the ultimate goal.

Three common mistakes

"These are stages of language development." They are not. These are the stages of listening development. A child may be advanced in language and still be at the discrimination stage for a particular sound.

"The stages are completed one after another." They are not. The stages are worked on in an interwoven way: a child may be at the comprehension level with familiar words while being at the discrimination level for a new phoneme contrast. Every new content can restart the hierarchy (Cole & Flexer, 2019).

"Visual support can be given." It can be, but then auditory skill is not what has been measured. By definition of the hierarchy, the skills are tested through hearing alone — without visual cues.

Variables for adjusting difficulty

There are ways of increasing difficulty while staying at the same stage, and this is the real skill of session planning: set size (closed → open), acoustic similarity (words differing in length → minimal pairs), contextual support (a familiar topic → unexpected content), distance and intensity, noise level (quiet → low signal-to-noise ratio), talker variety (a single familiar voice → different speakers).

Erber and the official programme in Türkiye

The most striking point here is an overlap that most audiologists starting out do not notice. MEB's Auditory Training module consists of four units (MEB, 2021):

In other words, the hearing module of the official support education programme in Türkiye is built directly on the Erber hierarchy. The practical implication of this is considerable: Learning Erber is not merely a theoretical exercise; it is learning the framework in which you will write your IEP.

For a detailed treatment, sample tasks and error analyses: Auditory Perception Development guide.

06The rehabilitation cycle: from assessment to monitoring

Auditory rehabilitation is not a linear path but a repeating cycle. It has five steps, and each step feeds the next.

1. Assess. Determine which stage the child is at, which skills they have gained and where they are stuck. Standardised scales (questionnaires based on parent report, auditory performance scales), speech perception tests and structured observation are used together. A goal chosen without assessment is a guess. → Assessment and Monitoring guide

2. Set goals. Translate the assessment result into measurable short- and long-term goals. The goal should not be "auditory perception will improve"; it should be something like "will choose correctly on 8 of 10 trials, by listening alone, in a closed set, between three-syllable and one-syllable words". → IEP — Auditory Goals guide

3. Plan. Determine the activity, the materials and the level of difficulty that suit the goal. Preparing more than one activity for the same goal keeps the plan from collapsing when the child's attention drifts. → Session Planning guide

4. Deliver. Run the session — but verify the device at the start of every session. A session that begins without a battery/charge check, visual inspection, listening check and a quick Ling 6 screen is a session run without knowing what the child is hearing that day. → Daily Device Check and The Ling 6 Sound Test guides

5. Monitor. Record the data; re-measure progress at regular intervals. If there is no progress, the goal, the method or the device is questioned. The cycle returns to step one.

There are two tasks that lie outside this cycle but touch every step of it: family guidance (planning and coaching the work done at home) and environmental modification (classroom acoustics, remote microphone systems, seating arrangement).

07Auditory rehabilitation in adults

The field is most often associated with children, yet the adult side of auditory rehabilitation is both widespread and largely neglected. A substantial proportion of adults who are fitted with a device stop using it because it does not deliver what they expected — and the reason for giving up is usually not the device itself, but never having learnt to communicate with it.

Differences from children

In post-lingual loss the language is already there; the problem is not building language but re-mapping the degraded or altered signal onto established representations. This difference has three consequences:

The focus shifts from listening skill to communication management. The adult's vocabulary is intact; the difficulty lies in noisy settings, the telephone, group conversation and listening effort.

Insight and motivation are decisive. An adult can describe their own difficulty and set their own goals. On the other hand, the fatigue, avoidance and social withdrawal that the loss brings can undermine the process.

Involving the partner or a close relative changes the outcome. Communication takes two; training only the person with hearing loss is often not enough.

What do you work on?

Communication strategies. These fall into two groups: anticipatory strategies (managing the situation before difficulty arises — choosing the setting, learning the topic in advance, sitting close to the speaker) and repair strategies (recovering after communication has broken down — asking a targeted question instead of requesting a vague repetition: instead of "What did you say?", "What time did you say?").

Managing the speaker and the environment. Guiding the speaker to talk face to face and to reduce background noise; adjusting the acoustics of the setting.

Structured auditory training. Speech perception work in quiet and in noise; computer-based programmes make it easier to continue this at home.

Counselling. Managing expectations, acceptance, adjusting to life with a device.

What does the evidence say?

Group-based programmes do work. A systematic review of counselling-based adult group rehabilitation programmes found reasonable evidence of a short-term reduction in the subjective perception of hearing handicap and of improvement in communication strategies; in addition, among those who attend these programmes device return rates are lower (Hawkins, 2005).

The ACE programme. The Active Communication Education programme developed by Hickson and colleagues (2 hours a week, 5 weeks) has been reported to increase the use of communication strategies, to reduce participation restriction and to retain its effect 6 months later (Hickson, Worrall & Scarinci, 2007).

Computer-based auditory training. Data have been reported indicating that programmes such as LACE increase device satisfaction. The evidence in this area is, however, more contested than for group programmes; the most consistent benefit appears to lie in diversified programmes that also include cognitive and audio-visual components rather than purely auditory tasks.

The fact that the general aims of the MEB programme in Türkiye include "the effective use of communication, auditory perception and cognitive skills after language acquisition" and "the use of compensatory strategies when communication breaks down" shows that the adult/post-lingual side is recognised within the official framework as well (MEB, 2021).

08What does the evidence say?

The rationale for auditory rehabilitation is not clinical intuition but large-sample follow-up studies. Two major studies sum up the picture.

Early diagnosis and intervention change outcomes

The study by Yoshinaga-Itano and colleagues, covering 448 children with bilateral hearing loss, has shown that children who met all three components of the 1-3-6 criterion had significantly better vocabulary outcomes than those who did not (Yoshinaga-Itano, Sedey, Wiggin & Chung, 2017).

The second and less discussed finding of the same study is more measured. In the study, the vocabulary quotient was used: it is obtained by dividing the child's vocabulary age by their chronological age and multiplying by 100; a value of 100 means that vocabulary is at the same level as that of age peers. In children with no additional disability who met the 1-3-6 criterion, the mean of this value is 82 — that is, on average these children produce vocabulary at roughly four-fifths the level of their age peers. Moreover, in 37% of this subgroup the value is below 75.

These two findings should be read together: early diagnosis is necessary, but not sufficient on its own. Early diagnosis opens the door; what carries you through it is the quality and continuity of the intervention that follows. The audiologist's work in special education sits precisely in this gap.

Early fitting improves outcomes

The Australian LOCHI study (Longitudinal Outcomes of Children with Hearing Impairment) followed 470 children born between 2002 and 2007 who received a hearing aid or an implant by the age of three. The findings at five years (Ching et al., 2018):

• The earlier a hearing aid or implant is fitted, the better the speech, language and functional performance outcomes have been reported to be.
• It was reported that on standardised language and receptive vocabulary tests the five-year-old children fell an average of 0.5-1 standard deviations behind their typically hearing peers.
• The factors that predict outcomes are not only the timing of intervention: the degree of hearing loss, the presence of an additional disability, maternal education level and age at implantation have also been shown to be decisive (Ching et al., 2013).

Practical lessons from these findings

Time is the most critical variable and the only irreversible resource under the audiologist's control.

Technology alone is not enough. Even the best device cannot carry the outcome on its own unless it is worn and supported by intervention.

Additional disabilities and the family context affect the outcome considerably; goals and expectations must therefore be individualised.

Even a "good" outcome may not mean the level of typical peers. Setting goals that are realistic but ambitious protects the family from both disappointment and complacency.

09How does it work in Türkiye?

Knowing the theory is not enough; you also need to know the legal and institutional ground on which this work operates in Türkiye. The daily practice of an audiologist working in a special education and rehabilitation centre is built on that ground.

The legal framework: the MEB support education programme

The official basis for the hearing work carried out in special education and rehabilitation centres is MEB's Support Education Programme for Individuals With Hearing Impairment (MEB, 2021). The programme consists of seven modules:

We saw above that the Auditory Training module, which directly concerns the audiologist, maps one-to-one onto the Erber hierarchy. The second area of interest is the Learning Support module: the Auditory Attention and Memory unit within it (50 lesson hours) is devoted to the cognitive underpinnings of listening skill.

The process: from RAM to the IEP

In Türkiye, the delivery of support education follows a standard chain:

1. Disability health board report. It is obtained from a hospital and is the precondition for entitlement to support education.

2. RAM assessment. The Special Education Assessment Board within the Guidance and Research Centre determines which support education modules the individual will receive and for how long.

3. Baseline assessment at the centre. The centre establishes where the individual stands in the modules determined by RAM. This step is the audiologist's first real task: the module has been assigned, but you decide which attainment to start from.

4. The IEP. Short- and long-term goals are written on the basis of the baseline assessment. The IEP is the child's educational roadmap and a legal document.

5. Teaching and monitoring. The programme is delivered; progress is documented with performance record tables and end-of-term assessment forms.

The most frequently skipped link in this chain is the third step. The fact that a module has been assigned does not mean that the child will start at the beginning of that module; IEP goals written without a baseline assessment are most often either far too easy or too difficult to reach.

Three realities of the Turkish context

The team is not always complete. In small centres the boundaries between the roles of the audiologist, the speech and language therapist and the special education teacher become blurred. This makes it even more important that you know your own professional limits.

Resources are limited. There is little standardised material in Turkish; most professionals produce their own. Practice-oriented resources written in Turkish are limited (one example: Şan & Önder, 2022). The aim of this section is precisely to reduce that gap.

Family expectations have often not been managed. Explaining the concept of hearing age to a family who arrives with the expectation "the implant is in, so now they can hear" is one of the most valuable tasks of the first sessions.

10Summary

Auditory rehabilitation begins where the device leaves off. Technology delivers sound; what teaches comprehension is planned intervention.

Time is a resource that cannot be recovered. The critical (sensitive) period of the central auditory system is approximately 3.5 years and largely closes at around age 7. This is why the 1-3-6 criterion sets such strict targets.

Expectations are set according to hearing age, not chronological age — but catching up with peers requires progressing faster than typical.

The Erber hierarchy is the shared language of the field: detection → discrimination → identification → comprehension. The stages define listening development, are not strictly sequential and are tested by the auditory channel alone.

The choice of approach belongs to the family; the professional's job is to present the information in an unbiased way. Whichever approach is chosen, early and rich language input together with a working device are essential.

The process is a cycle: assess → set goals → plan → deliver → monitor. Every session begins with verification of the device.

The adult side is a neglected but evidence-based area: communication strategies and group programmes do work; involving the partner changes the outcome.

Early diagnosis is necessary but not sufficient. Even in children who meet 1-3-6, the mean vocabulary level can remain behind that of their age peers; what closes the gap is high-quality intervention.

In Türkiye the foundation is the MEB support education programme. The Auditory Training module (200 lesson hours) is built directly on the Erber hierarchy; the process runs from the RAM assessment to the IEP, and the baseline assessment must not be skipped.

11References

AG Bell Academy for Listening and Spoken Language. (2007/2024). Principles of certified LSLS auditory-verbal therapists. https://agbellacademy.org/certification/principles-of-lsl-specialists/

Ching, T. Y. C., Dillon, H., Button, L., Seeto, M., Van Buynder, P., Marnane, V., Cupples, L., & Leigh, G. (2018). Learning from the Longitudinal Outcomes of Children with Hearing Impairment (LOCHI) study: Summary of 5-year findings and implications. International Journal of Audiology, 57(sup2), S105–S111.

Ching, T. Y. C., Dillon, H., Marnane, V., Hou, S., Day, J., Seeto, M., ... & Yeh, A. (2013). Outcomes of early- and late-identified children at 3 years of age: Findings from a prospective population-based study. Ear and Hearing, 34(5), 535–552.

Cole, E. B., & Flexer, C. (2019). Children with hearing loss: Developing listening and talking, birth to six (4th ed.). Plural Publishing.

Erber, N. P. (1982). Auditory training. Alexander Graham Bell Association for the Deaf.

Estabrooks, W., MacIver-Lux, K., & Rhoades, E. A. (Ed.). (2016). Auditory-verbal therapy: For young children with hearing loss and their families, and the practitioners who guide them. Plural Publishing.

Hawkins, D. B. (2005). Effectiveness of counseling-based adult group aural rehabilitation programs: A systematic review of the evidence. Journal of the American Academy of Audiology, 16(7), 485–493.

Hickson, L., Worrall, L., & Scarinci, N. (2007). A randomized controlled trial evaluating the active communication education program for older people with hearing impairment. Ear and Hearing, 28(2), 212–230.

Joint Committee on Infant Hearing. (2019). Year 2019 position statement: Principles and guidelines for early hearing detection and intervention programs. Journal of Early Hearing Detection and Intervention, 4(2), 1–44.

Kral, A., & Sharma, A. (2012). Developmental neuroplasticity after cochlear implantation. Trends in Neurosciences, 35(2), 111–122.

Millî Eğitim Bakanlığı. (2021). İşitme yetersizliği olan bireyler için destek eğitim programı. Özel Öğretim Kurumları Genel Müdürlüğü. https://ookgm.meb.gov.tr/www/destek-egitim-programlari/icerik/205

Şan, İ., & Önder, S. (2022). İşitsel rehabilitasyonda uygulama örnekleri. Akademisyen Kitabevi.

Sharma, A., Dorman, M. F., & Spahr, A. J. (2002). A sensitive period for the development of the central auditory system in children with cochlear implants: Implications for age of implantation. Ear and Hearing, 23(6), 532–539.

Sharma, A., Nash, A. A., & Dorman, M. (2009). Cortical development, plasticity and re-organization in children with cochlear implants. Journal of Communication Disorders, 42(4), 272–279.

Tye-Murray, N. (2020). Foundations of aural rehabilitation: Children, adults, and their family members (5th ed.). Plural Publishing.

Yoshinaga-Itano, C., Sedey, A. L., Wiggin, M., & Chung, W. (2017). Early hearing detection and vocabulary of children with hearing loss. Pediatrics, 140(2), e20162964.