Vol. 17:1 (2022) ► pp.104–131
A N400 event-related potential elicitation paradigm for Canadian French speakers [*] *
The N400 event-related brain potential (ERP) can be used to evaluate language comprehension, and may be a particularly powerful tool for the assessment of individuals who are behaviourally unresponsive. This study presents a set of semantic violation sentences developed in Canadian French and characterizes their ability to elicit an N400 effect in healthy adults. A novel set of 100 French sentences were created and normed through two surveys that assessed sentence cloze probability (n = 98) and semantic plausibility (n = 99). The best 80 sentences (40 congruent; 40 incongruent) were selected for the final stimulus set and tested for their ability to elicit N400 effects in 33 French-speaking individuals. The final stimulus set successfully generated an N400 effect in the grand-average across all individuals, and in the grand-average within age groups (young, middle-age, and older adults). On a single-subject level, the final stimulus set elicited N400 effects in 76% of the participants. The feasibility of using this stimulus set to assess semantic processing in behaviourally unresponsive individuals was demonstrated in a case example of a French individual in a disorder of consciousness. These sentences enable the inclusion of Canadian French speakers in this simple assessment of language comprehension abilities.
Article outline
- 1.Introduction
- 2.Phase 1: Sentence creation and norming
- 2.1Materials and method
- 2.1.1Sentence creation
- 2.1.2Sentence norming
- 2.1.3Participants
- 2.2Results
- Participant characteristics
- Prospective N400 sentences characteristics
- 2.1Materials and method
- 3.Phase 2: N400 event-related potential validation
- 3.1Materials and methods
- 3.1.1Participants
- 3.1.2Stimulus presentation
- 3.1.3Electroencephalographic recording and pre-processing
- 3.1.4Event-related potential analysis
- 3.2Results
- 3.2.1Participants correctly identified the congruent and incongruent sentences
- 3.2.2The final stimulus sentences set generated N400 event-related potentials
- 3.2.3The final stimulus set generated N400 ERPs across all age groups
- 3.2.4Individual responses to sentences varied between age groups
- 3.1Materials and methods
- 4.Case application: Disorders of consicousness
- 4.1Materials and methods
- 4.2Results
- 5.Discussion
- Note
-
References