Interference Resolution in Nonfluent Variant Primary Progressive Aphasia: Evidence From a Picture-Word Interference...

Area of Science:

• Neuroscience
• Linguistics
• Psychology

Background:

• Picture-word interference tasks assess lexical access and selection in primary progressive aphasia (PPA).
• Investigating the temporal dynamics of language production in PPA is crucial for understanding disease progression.

Purpose of the Study:

• To examine the time course of picture naming in Greek-speaking individuals with nonfluent variant PPA (nv-PPA).
• To determine how nv-PPA affects grammatical gender processing and lexical selection during speech production.

Main Methods:

• A picture-word interference task was employed with 8 nv-PPA participants and 8 controls.
• Participants named objects, with interference manipulated by distractor word gender at +200 ms and +400 ms stimulus onset asynchrony.

Main Results:

• nv-PPA participants exhibited significantly longer picture-naming latencies than controls.
• While controls showed interference at both time points, nv-PPA participants only showed interference at +400 ms.
• Gender-congruency effects differed between groups, suggesting altered interference resolution in nv-PPA.

Conclusions:

• Individuals with nv-PPA demonstrate abnormal gender interference resolution, impacting the timing of picture-naming.
• Findings suggest underlying deficits in lexicosyntactic networks contributing to speech production difficulties in nv-PPA.