Electrophysiological studies of autism: the whisper of the bang.
A 1982 idea that autism starts in the brainstem has not held up; later ERP and ABR work points to later cortical and auditory-processing stages instead.
01Research in Context
What this study did
Tanguay et al. (1982) wrote a narrative review about brain electricity in autism. They looked at early EEG and ABR papers. They asked if the brainstem, not just the thinking brain, starts the autism cascade.
The authors urged future work to test babies who show speech delays but do not yet carry an autism label.
What they found
The review proposed that a weak brainstem filter in the first year could derail later language and social growth. They had no new data, only a story built from scattered case reports.
How this fits with other research
Barthelemy et al. (1989) later ran direct ABR tests and found no group differences, an apparent contradiction. The 1989 team used tighter controls and larger samples, so their null result weakens the 1982 claim.
Iwata (1993) updated the field in a follow-up review. After pooling a decade of ABR work, the author called the brainstem story inconclusive and warned clinicians to rule out simple hearing loss first.
Wagner et al. (2025) extended the 1982 plea by testing 9-month high-likelihood infants with fMRI. They found atypical cortical language circuits, showing the field has shifted upstream from brainstem to cortex.
Why it matters
The paper reminds you to think about early sensory pathways when language stalls, but do not assume brainstem damage. Always complete a hearing screen before you blame attention or compliance. If you serve toddlers with emerging delays, push for an audiology referral and track how they react to soft sounds during your sessions.
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02At a glance
03Original abstract
Many neurophysiological hypotheses have focused upon the level of the central nervous system at which abnormal neural function may be present. Although some have argued that the type of language and cognitive defects shown by autistic children almost certainly reflects forebrain dysfunctions, current studies point to the possibility that some autistic children may have dysfunction of neural systems in the brainstem. One interpretation of these findings is that such abnormalities, occurring during a critical phase of early postnatal development, might themselves have acted directly as neuropathological agents, adversely influencing developing forebrain systems. A model for such an event has already been identified in animal research. If this be true, neurobiologists may not necessarily be identifying what is current pathology but may only be seeing a reflection of abnormal neural factors that once were important in development of the syndrome. Such a possibility suggests that investigators should consider extending their current studies to include young normal children as well as children with prototypic signs of abnormal language and interpersonal development.
Journal of autism and developmental disorders, 1982 · doi:10.1007/BF01531307