Understanding the Four Categories of Auditory Processing Weaknesses

If your child has been referred for an auditory processing disorder (APD) evaluation, you may have come across the term "Buffalo Model." This is the diagnostic and therapy framework we use at HearSense SC, and understanding it can help you make sense of your child's evaluation results and what they mean going forward.

To be clear, APD is not a hearing loss. A child with APD typically has normal hearing sensitivity — meaning the ears themselves are working — but the brain has difficulty processing what it hears. The Buffalo Model organizes these processing difficulties into four categories, each describing a different way auditory information can break down.

Decoding

Decoding refers to the brain's ability to quickly and accurately make sense of speech at the phonemic level — the individual sounds that make up words. As described by Jack Katz, Ph.D., the researcher behind the Buffalo Model, decoding is "the ability to quickly and accurately digest speech."

Children with decoding weaknesses often struggle to distinguish between similar-sounding words or sounds, particularly in everyday listening situations. This can affect reading, spelling, and overall language comprehension. Because decoding is tied to the auditory cortex, it reflects how efficiently the brain interprets incoming sound signals.

Tolerance-Fading Memory (TFM)

This category covers two related challenges. The first is difficulty hearing and understanding speech in noisy environments — a "tolerance" issue, meaning background noise interferes with the ability to focus on what matters. The second is trouble holding onto auditory information in short-term memory once it has been heard.

Children with TFM difficulties often struggle in classrooms, where there is constant background noise and where teachers give multi-step verbal instructions. They may ask for things to be repeated frequently, or appear inattentive when the environment is less than ideal for listening.

Integration

Integration is the ability to combine information from both auditory and visual channels at the same time. When this process is weak, a child may have significant difficulty with reading and spelling — tasks that require the brain to link what a word looks like with what it sounds like.

Integration weaknesses are often associated with dyslexia and can be one reason why a child who is bright and capable struggles unexpectedly with written language. Because this category involves both the auditory and visual systems working together, it can sometimes be overlooked when only one system is assessed in isolation.

Organization

Organization refers to the ability to retain and sequence auditory information in the correct order. A child with organizational weaknesses may follow individual instructions but lose track of multi-step directions, or struggle to retell events in the right sequence.

This category reflects how the brain manages and orders incoming auditory input over time. It can affect not only academic performance but also everyday communication and the ability to follow routines.

Why This Framework Matters

One of the reasons we use the Buffalo Model is that it gives us a specific profile for each patient rather than a single blanket diagnosis. Two children can both receive an APD diagnosis and have very different underlying challenges. Knowing which categories are affected allows us to target therapy toward the areas that will make the biggest difference.

Our APD evaluations typically take three to four hours, followed by a counseling session where we walk through the results with parents in detail. You receive a written summary as well, along with recommendations your child's school can use for accommodations. A full report follows within about a month.

We offer both in-person evaluations at our Columbia, SC clinic and telehealth evaluations for families in South Carolina, North Carolina, Georgia, and Florida. Once an evaluation is complete, therapy options — including Buffalo Model auditory training — are available based on your child's specific profile.

Schedule an APD Evaluation in Columbia, SC

If you have concerns about how your child is processing what they hear — whether in the classroom, at home, or in noisy settings — an evaluation is a practical first step. Our team is trained specifically in APD assessment and therapy, and we work with patients as young as four years old through adulthood.

Contact us at (803) 567-2533 or visit hearsensesc.com to schedule an appointment or learn more about what our evaluation process involves.