ADHD and auditory processing: where does the difference actually begin?

When we talk about ADHD and listening difficulties, it is tempting to assume that the problem is simply “attention.” But listening is not a single process.

Before we consciously decide what to pay attention to, the auditory system is already detecting changes in sound, distinguishing relevant from irrelevant information, and automatically orienting towards unexpected events. Only later do more deliberate attentional and cognitive processes become involved.

A recently published study in NeuroImage: Clinical provides an interesting window into how these different stages of auditory processing may develop differently in children with ADHD.

Researchers recorded EEG from 80 children with ADHD and 80 typically developing children aged 7–12 while they completed an auditory oddball task. Rather than looking at behaviour alone, the researchers examined three event-related potential components: mismatch negativity (MMN), P3a and P3b.

MMN is particularly interesting because it reflects relatively early and largely automatic detection of changes in incoming auditory information. P3a is associated with involuntary orienting towards unexpected or salient stimuli, while P3b is more closely linked with later, task-related cognitive processing.

The developmental patterns were not the same across the two groups.

In typically developing children, MMN amplitude increased steadily with age, and stronger MMN responses were associated with faster behavioural responses. In children with ADHD, however, MMN showed a different age-related trajectory, with reduced amplitudes particularly between ages 9 and 12. Younger children with ADHD also showed reduced P3a amplitude. Interestingly, within the ADHD group, behavioural performance was associated instead with P3b latency — a later stage of processing.

The authors suggest that children with ADHD may rely more heavily on later cognitive processing during auditory attention tasks, whereas typically developing children may benefit more from efficient early perceptual and involuntary attentional mechanisms.

I find this particularly interesting because it challenges the idea that listening difficulties in ADHD can be reduced simply to “not paying attention.”

The auditory system operates across multiple levels, from relatively early neural encoding and automatic detection of change to attentional selection and higher-order cognitive processing. ADHD-related differences may not occur at one single point along that pathway.

This also raises an important question for ADHD research: when someone with ADHD says, “I heard you, but I didn’t process what you said,” what part of the system are we actually measuring?

Behavioural performance alone cannot always answer that question.

Electrophysiological measures can help us examine what happens before a behavioural response appears — and potentially distinguish differences in early sensory processing from those emerging later through attention, cognition and executive control.

There are important limitations. This was a cross-sectional study of children, so the age-related patterns should not be interpreted as individual developmental trajectories. The sample was also predominantly male, particularly in the ADHD group. Longitudinal work will be important before these ERP differences can be considered developmental markers.

Still, this is exactly why I find auditory neuroscience in ADHD so fascinating. Listening is not simply hearing. And attention is not a switch that is either on or off.

Understanding where along the auditory–cognitive pathway differences emerge may ultimately help us understand why everyday listening can be so effortful for some people with ADHD — even when their peripheral hearing is perfectly normal.

Research reference

Read the open-access study in NeuroImage: Clinical

My doctoral research

My doctoral research at Macquarie University examined auditory processing and spatial listening in adults with ADHD using electrophysiological, behavioural and subjective measures. While the study discussed above focused on children, my own research investigated related questions in adults.

Read my doctoral thesis →