Exploring the activation of target words in adults who stutter with and without conscious intention to speak: ERP evidence.
Nathan D Maxfield
PMID 39608126WHAT IT FOUND
When adults who stutter named pictures, their brain response to matching spoken words was similar to fluent adults, but spread less widely.
Without naming, both groups showed similar responses. This is a lab finding, not therapy evidence.
Key findings
01During picture naming, both groups showed a less negative late brain response to probe words identical to the picture name than to unrelated probe words at anterior scalp sites.
02In the picture naming task, this priming response also appeared at right-side scalp sites in typically fluent adults, but not in adults who stutter.
03During conceptual judgments without naming, both groups showed a less negative late brain response to identical probe words across anterior, frontal, central, parietal, and posterior scalp sites.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study tested 18 adults who stutter and 18 typically fluent adults, all young adults with normal vocabulary, so it does not show what happens in children, older adults, or people with other speech-language conditions. The picture naming task was delayed and unnatural, because it was designed to keep speech muscle movement from contaminating the brain recording. The researchers inferred target-word activation indirectly from how a later probe word was processed, not by measuring word selection directly. For the no-naming task, three adults who stutter and three fluent controls were excluded because their accuracy was 75% or lower. No therapy was tested, and no clinical stuttering outcome was measured.
The easy way to misread this
Do not conclude that adults who stutter have a word-activation problem. The naming task showed a priming response in both groups, and the reported group difference was in where the response appeared on the scalp, not in whether it appeared.