VRA Troubleshooting: What to Check When Testing Is Not Working

When Visual Reinforcement Audiometry (VRA) is not working, sort the problem before changing the method. Check, in order: whether the child conditioned, whether the stimulus is audible, whether responses are clear and repeatable, whether attention or fatigue changed mid-session, whether the reinforcer still has value, whether cues or false responses crept in, and whether the room and equipment are actually ready.

The hard part is that different problems look identical from the tester’s chair: the child does not turn, stops turning, turns without sound, or loses interest. This guide is a practical sorting framework for hearing-care professionals, drawn from the 2025 British Society of Audiology (BSA) recommended procedure and current research. It is not a rigid protocol, and it does not replace your clinic’s own policy or a pediatric audiologist’s judgment.

Why won’t the child condition?

Most conditioning failures trace to one of four causes: the child is not developmentally ready, the stimulus is not clearly audible, the familiarization phase was too brief, or the task does not match the child’s stage. Rule out audibility and readiness before concluding that VRA is the wrong method for this child.

Developmental readiness comes first. The BSA recommended procedure describes VRA as appropriate from a minimum developmental age of 6 to 7 months up to around 30 months, and the American Academy of Audiology (AAA) 2020 guidance frames the core population as approximately 5 to 24 months developmental age. Second, confirm the conditioning trials paired a clearly audible stimulus with the reinforcer; both documents set a criterion of about two consecutive responses to sound alone before threshold search begins. Third, consider task mismatch: an older toddler who ignores the reinforcer may be ready for play audiometry, which the AAA guidance places at approximately 2 to 5 years. For the full familiarization sequence, see our post on what to do when a child will not condition.

Why did responses decline after conditioning?

A drop in responses after successful conditioning usually signals habituation, not hearing change. Check reinforcer duration, reinforcer variety, attention level, and fatigue before re-instructing the child. Research reviewed in 2025 found that shorter reinforcer durations and more varied, complex reinforcers help maintain response behavior across the session.

The evidence here is fairly consistent. A scoping review of 59 studies (Visram et al., 2025) reported that increased variety and complexity of visual reinforcers, and short reinforcer durations, improved response behavior. Culpepper and Thompson (1994) tested 60 two-year-olds with 0.5, 1.5, and 4.0 second reward durations and found significantly slower habituation with the brief reward, and Primus (1987) reported that introducing animation in toy reinforcers roughly doubled responses. The BSA procedure adds that alternating reward toys helps, and that a 10 minute break has been shown to significantly increase responses after initial habituation. So the working checks are: shorten the reward, vary the reinforcer, and rest the child. Our VRA habituation post covers pacing in more depth.

What causes false or inconsistent VRA responses?

False and inconsistent responses are checked with no-sound control trials, non-rhythmic stimulus timing, and strict scoring of clear head turns only. The 2025 BSA recommended procedure treats results as valid only when false positives on no-sound trials stay at or below about 30 percent across the test.

Run the checks in this order. First, insert no-sound trials, moments when a stimulus would normally be presented but is withheld, and watch whether the child turns anyway. Second, listen to your own timing: the BSA procedure warns that rhythmic presentation invites anticipatory turns, and that prolonged presentations of about 4 seconds or more increase false positives. Third, watch the second tester, whose changes in activity linked to stimulus presentation can cue the child. Fourth, tighten scoring to clear, repeatable head turns. Finally, Norrix (2015) distinguishes minimum response levels from true thresholds and argues that cross-check measures determine how much weight a behavioral result can carry. Reliability matters more than the number of points collected. More detail is in our post on false and inconsistent responses.

What if the child is upset or over-engaged with the reinforcer?

When a child is frightened by an animated reinforcer or too absorbed in it to keep working, adjust the reinforcer rather than the child. The BSA recommended procedure suggests rewarding with simple illumination instead of full animation, switching to alternative toys, and pausing presentations while the child is overly engrossed in a distraction toy.

Both reactions are common and neither ends the session by itself. For a startled child, the BSA procedure notes that some children are upset by certain animated toys, and that lighting the reinforcer without animation, or moving to a different toy, is a reasonable option. For an over-engaged child, avoid presenting stimuli just after a new distraction toy is revealed, and let engagement settle before the next trial. How the session ends matters too: a child carried out crying remembers the booth, so protecting the experience protects the next appointment. This is workflow guidance, not behavioral therapy; concerns about a child’s regulation or development belong with the appropriate specialist.

Is the room setup adding distraction or delay?

Room setup problems show up as delay between trials, missed observation windows, and cueing. Check sightlines, reinforcer placement at about 90 degrees to the child at head level, a concealed toy supply, parent positioning, and whether every control the tester needs sits within comfortable reach.

The BSA procedure is specific about geometry: reinforcers at roughly 90 degrees azimuth at the child’s head level, distraction play at a low table so the child’s gaze sits forward and slightly down, the toy supply concealed, and the parent supporting the child at the waist rather than letting the child lean against them. Ergonomics matters for the tester as much as the child. An ASHA ergonomic case study (Trudel, 2014) observed an audiologist making extended reaches to the audiometer and reinforcement controls, with sustained trunk flexion, and recommended repositioning equipment within comfortable reach. Every extra reach adds delay between stimulus and reward, and timing is the mechanism of VRA. Confirm the two testers can communicate without the child noticing, and that nothing in the room outcompetes the reinforcer.

What to check when the equipment does not respond

Equipment checks are separate from clinical interpretation. Before questioning the child’s responses, confirm power at every unit, remote batteries, the signal path between remote and reinforcer, channel settings, and cable connections, then run a known-good test by triggering each reinforcer directly. Keep a written per-room checklist so any tester can verify readiness in under a minute.

A generic sequence that works for most reinforcer systems:

1. Confirm power at each reinforcer unit and at the remote (fresh batteries first, the most common fault).
2. Check the control path. An IR (infrared) remote needs line of sight to the sensor, so clear any obstruction. An RF (radio frequency) remote is omni-directional, but remote and unit must be set to the same channel.
3. Inspect cable connections at the booth feedthrough and at each unit.
4. Trigger each unit directly with the remote, outside a test session, and confirm it activates every time.
5. If one unit responds and another does not, swap positions or channels to isolate the fault.

On Pehratek systems, the design keeps this list short: the units are plug and play, with no computer, no software, and no calibration required, so power, batteries, channel, and line of sight cover nearly everything. Pehratek offers RF remotes with four omni-directional channels and IR remotes that work by line of sight, and the eight-button SMART remote controls all units, including centering units. Model-specific steps for the HD Video VRA (VDS-3000) and 3D Toy VRA (XM-5000) systems are in each product manual, and Pehratek support can walk a clinic through them. If downtime is a recurring problem rather than a one-off fault, see our post on VRA reliability and downtime.

The VRA troubleshooting decision path

Work through the questions in order: conditioned, audible, clear response, response decline, false positives, fatigue, developmental fit, and equipment readiness. When the answers do not resolve the session, the framework stops, and local policy, repeat testing, or objective measures such as electrophysiological assessment take over.

1. Did the child ever condition? No: check readiness, audibility, and the familiarization sequence before changing methods.
2. Is the stimulus clearly audible for conditioning trials? No: raise the level for conditioning, then return to threshold search.
3. Are responses clear, repeatable head turns? No: tighten scoring and re-check your observation window.
4. Did responses decline after a good start? Yes: shorten reward duration, vary the reinforcer, or take a break.
5. Do no-sound trials stay clean? No: slow down, break rhythm, remove tester cues, and re-run control trials.
6. Is the child upset or over-engaged? Yes: switch to simple illumination or an alternative toy.
7. Are the room and equipment ready? No: fix sightlines, reach, channels, and power before the next appointment.
8. Still unresolved? Stop troubleshooting and follow local policy: repeat testing or objective measures.

That last step is not a failure. The AAA guidance states that when complete, reliable behavioral results cannot be obtained or replicated, electrophysiological threshold prediction should be completed, and the cross-check principle weighs behavioral, physiologic, and electrophysiologic findings together (Norrix, 2015). A framework tells you where to look; your clinic’s protocol and the audiologist in the room decide what happens next.

Frequently asked questions

Why won’t a child condition during VRA?

The usual causes are developmental readiness, audibility, and a rushed familiarization phase. VRA generally suits children from about 6 months to around 30 months developmental age, and conditioning is established by pairing a clearly audible stimulus with the reinforcer until the child gives about two consecutive responses to sound alone. If a developmentally older child is uninterested, play audiometry may fit better.

Why did a child stop responding after conditioning?

The most common reason is habituation, the normal fading of interest in a repeated reward, rather than a change in hearing. Research supports shorter reinforcer durations, varied and more complex reinforcers, and rest breaks to recover responses. A roughly 10 minute break has been shown to significantly increase responses after initial habituation.

How are false-positive VRA responses checked?

Testers insert no-sound control trials, moments when a stimulus would normally be presented but is withheld, and watch whether the child turns anyway. The 2025 BSA recommended procedure treats results as valid when false positives on no-sound trials stay at or below about 30 percent. Avoiding rhythmic presentation and tester cues keeps the rate down.

When should the reinforcer be changed?

Change the reinforcer when responses decline even though the stimulus is audible, or when the child is frightened by it or too absorbed in it. Options include switching toys, alternating between reinforcers, shortening the reward duration, or using simple illumination instead of full animation. Novelty is the working principle: one study reported that adding animation to toy reinforcers roughly doubled responses.

When should a clinic stop troubleshooting and use objective measures?

When reliable behavioral results cannot be obtained or replicated within the session, professional guidance calls for electrophysiological threshold prediction and cross-checking behavioral results against physiologic measures. The troubleshooting framework sorts session problems; it does not replace local protocol, repeat appointments, or objective testing.

What should be checked first when a VRA reinforcer unit stops responding?

Start with power and remote batteries, since they cause most faults. Then check the control path: an IR remote needs clear line of sight to the unit, and an RF remote and its unit must share the same channel. Finish by checking cables and triggering each unit directly to confirm it activates.

If the clinical checks come up clean and the reinforcer system itself is the problem, that is where we come in. Pehratek has made VRA systems since 1979, and our support team can walk you through device checks, parts, and replacement remotes for the HD Video VRA and 3D Toy VRA systems. Reach us through pehratek.com or at info@pehratek.com. School districts and other public-sector buyers can purchase through BuyBoard Contract 804-26.

This article is educational content for hearing-care and procurement professionals. It is not medical advice. Product availability and specifications can change; confirm current details at pehratek.com.

References

• Visram AS, Jackson IR, Almufarrij I, Stone MA, Munro KJ. Optimisation of visual reinforcement audiometry: a scoping review. International Journal of Audiology. 2025;64(8):773-783. https://doi.org/10.1080/14992027.2024.2397716
• British Society of Audiology. Recommended Procedure: Visual Reinforcement Audiometry. Version 1.2, June 2025. PDF
• American Academy of Audiology. Clinical Guidance Document: Assessment of Hearing in Infants and Young Children. 2020. PDF
• Culpepper B, Thompson G. Effects of reinforcer duration on the response behavior of preterm 2-year-olds in visual reinforcement audiometry. Ear and Hearing. 1994;15(2):161-167. https://doi.org/10.1097/00003446-199404000-00005
• Primus MA. Response and reinforcement in operant audiometry. Journal of Speech and Hearing Disorders. 1987;52(3):294-299. https://doi.org/10.1044/jshd.5203.294
• Norrix LW. Hearing thresholds, minimum response levels, and cross-check measures in pediatric audiology. American Journal of Audiology. 2015;24:137-144. https://doi.org/10.1044/2015_AJA-14-0095
• Trudel C. Ergonomic Case Study of an Audiologist Performing Visual Reinforcement Audiometry. ASHA. 2014. Article