Étude comparative en potentiels évoqués des données fournies par le biais d'analyses de groupes et individuelles

Content Provider	Semantic Scholar
Author	Campanella, Salvatore Gómez, Charo Monforte Rossion, Bruno Liard, Laurent Guérit, J. M.
Copyright Year	1999
Abstract	PURPOSE: Event-related potentials (ERPs) studies in human subjects have shown inter-individual response variations, probably linked to anatomical and functional brain disparities. The present study was conducted to compare the results obtained by a standard grand-average method and a single subject analysis of VEPs to faces. MATERIAL AND METHOD: Fifty-eight channel ERPs (analysis time: 1,024 ms) were recorded in 13 normal volunteers during gender or familiarity judgements on unknown and known faces, as well as on a control task using meaningless patterns. Data were then submitted to individual and group averages. RESULTS AND CONCLUSION: Three activities were identified by both procedures: a P1/N1 complex, a vertex positive potential (P2 or VPP) associated with a temporal negativity, and a N2 negativity. These peaks displayed a marked inter-individual topographical variability. Regarding the outcome of statistical analyses, a certain number of differences were found: on P1, in which individual analyses revealed a strong effect of experimental conditions, while the grand-average method did not; on VPP, in which grand-average analyses suggested an interaction between experimental conditions, face familiarity and cerebral lateralization, while individual analyses did not; and on N2, in which grand-average data showed a clear lateralization effect, while individual analyses did not. A P3 component (Pz, 250 ms) was also defined in grand-average data, but could not be clearly described in individual data. Statistical analyses on this P3 component were thus only performed on group data and revealed a right lateralization and an interaction between face familiarity and experimental conditions. These findings confirmed the existence of a marked topographical variability of ERPs to face and, therefore, question the validity of grand-average studies. Moreover, these results suggest a better efficiency of individual analyses for studying short and middle-latency peaks, while grand-averages appear to be better suited for studying late components.
Starting Page	325
Ending Page	338
Page Count	14
File Format	PDF HTM / HTML
DOI	10.1016/S0987-7053(99)90046-1
Volume Number	29
Alternate Webpage(s)	https://api.elsevier.com/content/article/pii/S0987705399900461
Alternate Webpage(s)	https://www.sciencedirect.com/science/article/pii/S0987705399900461?dgcid=api_sd_search-api-endpoint
Alternate Webpage(s)	https://doi.org/10.1016/S0987-7053%2899%2990046-1
Journal	Neurophysiologie Clinique/Clinical Neurophysiology
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article