Cerebral Cortex Advance Access originally published online on February 8, 2006
Cerebral Cortex 2007 17(1):100-107; doi:10.1093/cercor/bhj130
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Electrophysiological Markers of Visuocortical Development
1 Centre de recherche, Hôpital Sainte-Justine, Montréal, QC, Canada, 2 Département de Psychologie, Université de Montréal, Montréal, QC, Canada, 3 Département d'Ophtalmologie, Hôpital Ste-Justine, Montréal, QC, Canada, 4 Institut National de la Santé et de la Recherche Medicale Equipe Mixte, EMI342, Lyon F-69677, France, 5 University Lyon1, Villeurbanne F-69622, France
Address correspondence to Maryse Lassonde, PhD, Ste-Justine Hospital Research Center, 3175 Côte Ste-Catherine, Montreal, QC H3T 1C5, Canada. Email: maryse.lassonde{at}umontreal.ca.
The development of noninvasive techniques for the assessment of functional brain maturation is critical. The present study analyzed 63 babies' and children's (27 days to 5.5 years) cerebral responses to a pattern-reversal visual stimulation using high-density (128 electrodes) electrophysiological recordings. Developmental data were further compared with those of young adults (n = 16). Tremendous changes in pattern visual evoked potentials (pVEPs) morphology were observed between 7 and 24 months characterized by the emergence of negative components labeled "N70" and "N145" and the reduction of the P100 amplitude. The adult pattern of response appears from 24 months onward. Spectral density values show an increase of higher frequencies with age. Coherence values show a reduction between 3 and 23 months of age as well as a further increase toward adulthood between areas implicated in visual processing. These results are discussed in light of developmental features such as synaptogenesis, myelination, and neuronal networks refinement.
Key Words: coherence analysis • functional • networks • spectral density • visual evoked potentials
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