The science behind ILS:
how does it strengthen your brain and body?
An in-depth explanation of the neurobiological workings of the ILS Focus System - in ADHD, autism, depression, anxiety and trauma. Substantiated by clinical data.
The ILS Focus System combines filtered music, bone conduction and movement to calm the nervous system and activate neuroplasticity. It works from the ground up: the brainstem and balance organ first, then the higher functions. Clinical data show significant improvements in ADHD, autism, depression, anxiety and trauma - in children, adults and seniors.
Neuroplasticity: training your brain and making it stronger, how does it work?
ILS does not work through conversations or advice, but directly on the physical structure of the brain. This makes it fundamentally different from most other forms of therapy.
How does ILS take advantage of neuroplasticity? Neuroplasticity is the brain's ability to make new connections through repeated, targeted stimuli. ILS provides simultaneous auditory, vestibular and proprioceptive stimulation, combined with movement exercises. This activates multiple brain regions simultaneously, accelerating the neuroplastic response. fMRI and DTI studies show measurable changes in white matter pathways after targeted auditory training.
Imagine the brain as a city with roads. Some roads are wide and fast - tasks on those routes go effortlessly. Other roads are narrow and bumpy - those take much more energy. Neuroplasticity is the city's ability to build new broad pathways. Not just in children, but at every age.
ILS uses a bottom-up approach: it starts at the lowest brain structures - the brain stem, the balance organ, the cerebellum - and works up from there to higher functions such as attention, language and emotion regulation. This is fundamentally different from ’top-down’ approaches that try to direct thoughts or behavior.
The three pillars of ILS
🎵 Filtered music
Classical music (Mozart, Vivaldi) is digitally processed to emphasize specific frequency bands. Low tones calm via the balance organ. High tones activate the cerebral cortex. Middle frequencies train the speech and communication centers.
🦔 Bone conduction
A transducer in the headphones sends gentle vibrations through the cranial bone directly to the inner ear - skipping the middle ear. This activates the vestibular system and sends a calming signal to the brainstem via the vagus nerve.
🏃 Movement
While listening, you perform targeted exercises. Music and movement together activate motor cortex, cerebellum and prefrontal lobe simultaneously - greatly accelerating the neuroplastic response compared to listening alone.
The four stages of neural change
A ILS program is not a static listening experience but a dynamic process that guides the nervous system through four phases - each with its own neurological purpose.
Organization - the foundation
Low frequencies dominate. Bone conduction generates maximum vibration in the vestibular system. The body learns to organize itself: posture, muscle tone and balance come into order. People describe this as ‘being more in my body.
Transition - the bridge
Low frequencies are gradually suppressed. The auditory system must adapt to the changing sound - this increases neural flexibility. Crucial for those who have difficulty with change or unexpected stimuli.
Activation - the stimulation
High frequencies come to the fore. These tones have an energizing effect on the cerebral cortex: alertness, working memory and processing speed increase. This is the phase when people experience a ‘breakthrough.
Integration - the anchoring
All frequencies return to balance. The brain integrates the entire sound spectrum. The newly established neural pathways become deeply anchored. This is the most crucial stage for lasting results.
Dr. Stephen Porges (scientific advisor to Unyte) showed that the nervous system always seeks safety before it can learn or recover. Through three states - ventral vagal (safe), sympathetic (alarm) and dorsal vagal (shutdown) - the autonomic nervous system determines what is ‘possible. ILS trains the nervous system to switch smoothly to the safe state, after which everything else becomes easier.
| Frequency Range | Directed brain structures | Clinical outcome |
|---|---|---|
| Low (0-750 Hz) | Brainstem, vestibular system, cerebellum | Balance, body awareness, grounding, tranquility |
| Middle (750-3000 Hz) | Speech centers (Broca, Wernicke), middle ear muscles | Auditory processing, language, social communication |
| High (3000-20,000 Hz) | Prefrontal cortex, cerebral cortex | Focus, working memory, processing speed, motivation |
How does ILS improve concentration and self-regulation in ADHD?
ADHD is not a lack of discipline but a neurological differentiation in which the brain has a different organization. ILS addresses that organization at the most fundamental levels.
How does the ILS Focus System improve concentration in ADHD? ILS simultaneously trains the cerebellum (for automation), the reticular activation system (for proper alertness) and the prefrontal cortex (for executive functions). Filtered high frequencies directly activate the attention centers. In pilot studies, children showed an average of 1.2 years of academic progress in reading and math scores after 40 hours.
The cerebellum: the automaton
The cerebellum contains nearly 50% of all neurons in the brain. For a long time, we thought this organ was only for motor function - we now know that it is intimately involved in planning, reasoning and emotion regulation. In many people with ADHD, the cerebellum is more slowly developed, leading to a lack of automaticity.
That means: tasks that come naturally to others - sitting up straight, holding a pen, ignoring environmental sounds - require conscious effort in someone with ADHD. This depletes cognitive reserves, leaving little ‘bandwidth’ for attention and learning. ILS trains the cerebellum to automate these basic tasks, freeing up the cortex for higher functions.
The Reticular Activation System: the alert switch
The Reticular Activation System (RAS) in the brainstem filters incoming sensory information and determines the level of alertness of the cortex. In ADHD, this filtering system often malfunctions: the brain is either overwhelmed by irrelevant stimuli or receives too little stimulation to stay alert. Both patterns lead to concentration problems, but in different ways.
ILS music, with its specific combination of rhythmic structure and frequency shifts, provides regulated input to the RAS. This helps keep the cortex at optimal arousal levels - exactly the state needed for sustained attention.
Cerebellum
Planning, organization, motor automaticity. ILS strengthens neural connections via vestibular stimulation - tasks proceed naturally rather than with conscious effort.
Brainstem (RAS)
Alertness, arousal, sensory filtering. ILS improves the ‘battery function’ of the brain: not too much and not too little activation.
Prefrontal cortex
Executive functions, impulse control, emotion regulation. High frequencies charge the cortex and support the maturation of inhibition mechanisms.
ILS programs specific to ADHD
| Program | Duration | Primary goal in ADHD | Expected result |
|---|---|---|---|
| Concentration & Attention | 40 hours | Attention span & working memory | Better focus and fewer distractions |
| Reading & Auditory Processing | 40 hours | Phonemic awareness & text comprehension | Accelerated reading speed and comprehension |
| Optimal Performance I & II | 48 hours | Executive functions & motivation | Increased productivity, less indecision |
| Sensory & Motor | 60 hours | Balance & sensory regulation | Less physical restlessness, better coordination |
From no bike to independent
A 10-year-old boy had spent years in therapy for learning and behavioral problems with no lasting results. At age 10, he could not ride a bike and had little motivation for schoolwork. Halfway through his ILS course, parents and teachers began to see significant changes: he learned to ride a bike, began talking at the table and showed renewed interest in his homework. The explanation: his brain was so busy with basic tasks like balance and motor planning that no cognitive space was left for learning and social contact. Training the cerebellum and brain stem via ILS freed up that space.
An October 2025 meta-analysis compared noninvasive brain stimulation (tDCS, rTMS) with integrative multisensory approaches. Although tDCS showed some improvement in working memory, the effects on hyperactivity were limited. ILS shows broader functional gains because it does not stimulate a single brain region, but strengthens connections between subcortical and cortical structures. A Frontiers in Pediatrics review (Nov. 2025) confirmed that concurrent multi-sensory training is more effective than single interventions.
ADHD in adults: biohacking and executive functioning
By 2026, the fastest-growing ADHD target group will be adult women, who have been overlooked for decades because of internalizing symptoms such as mind-wandering and extreme fatigue. For this group, ILS complements coaching: it trains the autonomic nervous system to switch more efficiently between concentration and rest, increasing productivity and lowering burnout risk.
For adults with ADHD, the Optimal Performance program is specifically valuable for reducing ‘time blindness’ and decision-making fatigue - two of the most disabling features of ADHD in a professional context.
How does ILS help with autism and sensory hypersensitivity?
Autism is increasingly understood as a disorder of neural connectivity. ILS stabilizes the base of the neurological pyramid, allowing space for higher functions such as language and social reciprocity.
How does bone conduction help autism? Bone conduction sends vibrations through the cranial bone directly to the vestibular system, which sends a safety signal to the brainstem via the vagus nerve. Clinically, this translates into a direct reduction in sensory hypersensitivity and meltdowns. In the Benson study, social-emotional functioning improved an average of 54% (Cohen's d=0.96) after 40 hours of ILS in children with autism.
Neural connectivity and the bottom-up approach
Autism is understood in modern neuroscience as a disorder of neural connectivity and synchronization - in which the integrity of subcortical systems directly affects higher cortical functions. The traditional approach has been to use behavioral therapy to directly influence behavior. ILS does it the other way around: it stabilizes the neurological foundation - the vestibular system, the brainstem, the cerebellum - so that higher functions such as language and social reciprocity have a chance to improve naturally.
The Polyvagal theory in autism
Individuals with ASD often exhibit a deficient ‘vagal brake’: their resting heart rate is higher and their nervous system switches to a defensive state more quickly. Via the auricular branch of the vagus nerve - which runs through the auditory canal - ILS sends a physiological safety signal directly to the brainstem. This promotes the transition to the ventral-vagal state, the biological basis for the Social Engagement System.
Clinical data show that when the nervous system is brought into a state of safety, symptoms such as reduced eye contact, flat vocal inflection and social anxiety improve significantly. This explains why children after ILS training are described as ‘literally more flexible in life’.
Sensory adaptation for vulnerable nervous systems
For children with severe sensory hypersensitivity who initially refuse the headphones: the bone conductor works through the entire skeleton. The headphones can rest on the shoulder or knee and still deliver full vestibular stimulation. This provides a gentle entry into therapy, at the pace of the child's nervous system.
Air conduction (AC)
Activates the cochlea and auditory cortex. Essential for processing language and frequencies. Trains middle ear muscles to filter the human voice from background noise - a skill that is underdeveloped in many children with ASD.
Bone conduction (BC)
Vibrations through the skull to the inner ear. Directly stimulates the vestibular apparatus: balance, muscle tone and postural control. Low frequencies via bone conduction give children with autism an immediate sense of ‘grounding’ - crucial in preventing meltdowns.
The Benson study: hard data in children with autism
In 2012, the Spiral Foundation published the results of an A-B-A study of 18 children with autism who completed a 40-hour ILS Focus program. The A-B-A design shows that improvements are directly attributable to the intervention, not to natural maturation.
| Domain | Average improvement | Effect size (Cohen's d) | Clinical significance |
|---|---|---|---|
| Social/Emotional functioning | +54% | d = 0.96 (High) | Visible to parents and teachers |
| Cognition & Organization | +53% | d = 1.04 (Very high) | Better planning and instructional follow-up |
| Auditory & Language Skills | +48% | d = 0.98 (High) | Smoother communication and speech comprehension |
| Motor coordination | +37% | d > 0.50 (Medium-large) | Smoother movement, fewer falls |
| Sensory processing | +34% | d = 0.88 (Large) | Less hypersensitivity to sound and touch |
SSP first - then ILS. For children with a highly defensive nervous system, Safe and Sound Protocol is the best preparation: it calms the nervous system and reduces auditory hypersensitivity. Only then can ILS occupy the vacated neurological ‘territory. Clinical observations show that this sequence significantly improves long-term outcomes.
How does ILS help with anxiety, depression and trauma?
Depression is neurobiologically a state of shutdown. Anxiety is a nervous system shutdown. Trauma is a freeze in defense mode. ILS works on all three - via the bottom-up route.
What are the proven results of ILS in anxiety and depression? From clinical data from Unyte (2024-2025): 85% of clients with anxiety symptoms experienced significant improvement (n=752, GAD-7). Of depression clients, 81% reported improvement (n=543, PHQ-9), with 53% shifting from ‘serious clinical concerns’ to ‘no clinical concerns. In trauma, 87% of PTSD clients experienced a noticeable decrease in symptoms (n=390, PCL-5).
Depression: from shutdown to revitalization
Depression is understood in modern neuroscience as a state of biological shutdown. When the nervous system is exposed to unresolvable stress for long periods of time, it may decide to conserve energy by minimizing responsiveness to the outside world. This results in the classic symptoms: low energy, slow cognitive processing, and an inability to experience pleasure or connection.
ILS addresses this by stimulating the brain in the activation and integration phase with high frequencies. High frequencies - which are abundant in the classical music of Mozart and Vivaldi - act as a battery for the brain. They restore the mental sharpness and creativity that are lost in depression.
Fear: teaching the brain that it is safe
Anxiety is characterized by a nervous system that is constantly looking for threat - even when there is none. This often manifests itself in hypersensitivity to sound: a refrigerator, a conversation down the road, children in the schoolyard can be perceived as overwhelming.
ILS trains the middle ear muscles in a manner similar to physical therapy. By filtering music in specific ways, these muscles are forced to tighten and relax. This in turn enables them to filter out the frequencies of human speech and muffle background noise. When a person is better able to hear a voice in noisy environments, the brain feels safer - and the overall state of readiness decreases.
Trauma: breaking the neurological prison
Trauma is, at its core, a break in connection - with others, but also with yourself. The nervous system is frozen in a defensive mode: chronic hypervigilance, or a dull shut-off. In either case, the prefrontal cortex has gone ‘offline’ and cognitive therapies do not reach the problem.
ILS offers a bottom-up route to safety. Through bone conduction, the body receives a sensory anchor - a tangible vibration that helps it feel gravity and land in its own body. At the same time, the filtered music trains the middle ear muscles to prioritize the frequencies of safe human connection. This translates into a physiological signal that says, ‘It's safe to connect.’
Speech problems and ILS - stuttering as a signal of an insecure nervous system
A 19-year-old man struggled with a stuttering problem that isolated him socially. Previous speech therapy had given limited results. After following the Sensory & Motor and Concentration & Attention programs, not only did his motor skills improve, but his stuttering decreased ‘quite profoundly. The explanation: communication is a multisensory process that requires a stable neurological base. When the nervous system feels secure, language can flow freely again.
Polyvagal theory in depression and trauma
Dr. Stephen Porges identifies three physiological states of the autonomic nervous system. The ventral vagal state is that of safety and social connection, in which recovery and growth are possible. The sympathetic state is activated when threatened: hypervigilance, anxiety, irritability. The dorsal vagal state occurs with overwhelming trauma: a shutdown that manifests as depression, dissociation and emotional numbness.
ILS intervenes directly in this physiological hierarchy - not through conversations but through the nervous system itself. This explains why 87% of trauma survivors report improvement: the intervention addresses the root of the dysregulation, not the symptoms.
| State of nervous system | How it feels | Effect on recovery | ILS input |
|---|---|---|---|
| Ventral vagal - safe | Quiet, present, connected | Ideal for growth and recovery | Objective of each ILS track |
| Sympathetic - alarm | Tense, hyperalert, irritable | Anxiety, exhaustion, sleep problems | Organization phase calms via bone conduction |
| Dorsal vagal - shutdown | Empty, absent, apathetic | Depression, dissociation, isolation | Activation phase excites cortex with high frequencies |
Anxiety manifests as an excess of nervous energy or a constant state of readiness. ILS channels this energy through the Integration Kit:
- Balance Board: The constant dialogue between vestibular system and brain ‘grounds’ the patient and reduces mental rumination.
- Eye-hand coordination: Throwing and catching forces the visual system to cooperate with the motor cortex - this reduces the tendency to scan for threat.
- Rhythm and timing: The repetitive nature of the exercises restores the internal rhythm that disturbs anxiety, which has an immediate calming effect on the central nervous system.
A 360-degree overview of research findings
From university pilot studies to clinical data from thousands of clients - the scientific underpinnings of ILS are broad and multidisciplinary.
What is the strongest evidence for the effectiveness of ILS? The most robust data come from the Benson study (ASD, n=18, A-B-A design, Cohen's d to 1.04), the University of New Mexico (reading improvement of an average of 2 learning years in 3 months), the Unyte Real-World Evidence database (n=1,685+) and a survey of 1,174 therapists on 1,304+ children with ASD. fMRI and DTI studies show measurable structural brain changes after targeted auditory training.
Clinical outcomes by category
Overview of all clinical studies
| Study/Source | Population | Design | Main finding |
|---|---|---|---|
| Benson study (Spiral Foundation, 2012) | 18 children with ASD | A-B-A, 40 hours ILS | Social functioning +54% (d=1.04), sensory +34% (d=0.88) |
| Practitioner Survey (Unyte). | 1304 children with ASD through 1174 therapists | Survey research | 70-80% reported ‘often’ or ‘always’ improvement in self-regulation and attention |
| University of New Mexico | Children with reading risk | Monitored, 3 months | Average reading improvement of 2 learning years in 3 months |
| Sylvan Pilot Study | K-3 students with learning disabilities | Pilot study | 1.2 years of academic progress in reading and math after 40 hours |
| Denver Area School Pilot | 20 children with severe learning and behavioral problems | School setting | 19 of 20 children showed significant improvement |
| Therapeeds Study (Florida) | 7 children with attention problems on medication | Clinical observation | All 7 children were able to completely discontinue medication after ILS |
| Veterans PTSD Study | Veterans with trauma and sleep problems | Clinical | Significant improvement in sleep quality and decrease in PTSD symptoms |
| HRV Study (Heart Rate Variability). | Mixed population | Verified | Immediate improvement in autonomic nervous system balance |
| Unyte Real-World Evidence 2024-2025 | Anxiety n=752, PTSD n=390, Depression n=543 | Platform outcome data | 85% anxiety, 87% PTSD, 81% depression - significant improvement |
fMRI and DTI: visible structural brain changes
Advanced imaging studies - fMRI and Diffusion Tensor Imaging (DTI) - have shown that targeted auditory training leads to measurable, robust changes in the physical architecture of the brain. After training periods of several weeks, statistically significant increased activation was observed in areas responsible for working memory, strategic planning and complex motor control.
Longitudinal research shows that intensive auditory-cognitive stimulation strengthens neural connectivity in the corpus callosum - the bridge between the left and right hemispheres of the brain. Stronger integrity here correlates directly with faster cognitive processing, better executive function and increased mental toughness.
Neurochemistry: BDNF and dopamine
At the cellular level, ILS stimulates the production of BDNF (Brain-Derived Neurotrophic Factor) - a growth factor that accelerates new synaptic connections. Studies suggest that high-frequency auditory stimulation also increases the release of dopamine promotes, the neurotransmitter underlying motivation, creativity and intrinsic drive. This explains the energizing effects users describe in the activation and integration phases.
Most ILS studies are small-scale or observational. Large randomized controlled trials (RCTs) are lacking as yet. Unyte platform data are real-world evidence without a control group. While this makes the results clear, this is not definitive evidence in the strictest scientific sense. Larger studies are needed for this first.
Scientific sources
- Unyte Real-World Evidence 2024-2025 - Anxiety (n=752, GAD-7), PTSD (n=390, PCL-5), Depression (n=543, PHQ-9)
- Sylvan Pilot Study - iLs Research & Supporting Data - Integrated Listening Systems
- Practitioner Survey on the Effectiveness of iLs with Children with ASD -. Integrated Listening Australia
- Spiral Foundation Benson Study 2012 (A-B-A design, n=18, ASD) - via Unyte: The Results
- Auditory Training: Evidence for Neural Plasticity in Older Adults -. PMC - NIH
- Auditory Cognitive Training Improves Brain Plasticity -. PMC - NIH
- Sound Localization Training and Induced Brain Plasticity: fMRI -. PMC - NIH
- Cognitive Enhancement Through Music Therapy: Meta-Analytic Evidence -. PMC - NIH
- Multimodal Training on Sensory, Motor and Cognitive Function (ADHD) -. PMC - NIH
- Neuroplasticity Mechanisms of NDBIs in Autism: Brain Connectivity -. PMC - NIH
- Dual-Task Exercise to Improve Cognition in Aging -. Frontiers in Aging Neuroscience
- The Impact of Binaural Beats on Creativity -. PMC - NIH
- Polyvagal Theory and Autism: Safety & Connection - Trauma Therapist Institute
- Evidence Based Interventions for ASD - Unyte
- SSP & Focus System: Therapeutic Listening -. Unyte
- iLs Practitioner Training Manual - Integrated Listening Systems
- Foundations of the ILS (May 2024) -. Unyte (PDF)
Demonstrated experience, not a textbook
We use ILS ourselves, as therapists. Both for ourselves and online and in our practice. We guide you from real knowledge and experience about the system.
Shahera el Katib
GZ-Psychologist - ILS & SSP Practitioner
Registered GZ-Psychologist, certified in the ILS Focus System and the Safe and Sound Protocol. Combines clinical psychology with in-depth knowledge of nervous system regulation and neuroplasticity. Works with children, adults and families.
William Bolle
Therapist - ILS & SSP Practitioner
Certified ILS and SSP Practitioner. Counsels clients of all ages for the Focus pathway, with a hands-on approach based on extensive real-world experience. And on one's own use of the system.
BrainArts & SoundTherapy - Utrecht - More about us →
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