Abstract:
:Experience-dependent modulation of the visual evoked potential (VEP) is a promising proxy measure of synaptic plasticity in the cerebral cortex. However, existing studies are limited by small to moderate sample sizes as well as by considerable variability in how VEP modulation is quantified. In the present study, we used a large sample (n = 415) of healthy volunteers to compare different quantifications of VEP modulation with regards to effect sizes and retention of the modulation effect over time. We observed significant modulation for VEP components C1 (Cohen's d = 0.53), P1 (d = 0.66), N1 (d=-0.27), N1b (d=-0.66), but not P2 (d = 0.08), and in three clusters of total power modulation, 2-4 min after 2 Hz prolonged visual stimulation. For components N1 (d=-0.21) and N1b (d=-0.38), as well for the total power clusters, this effect was retained after 54-56 min, by which time also the P2 component had gained modulation (d = 0.54). Moderate to high correlations (0.39≤ρ≤0.69) between modulation at different postintervention blocks revealed a relatively high temporal stability in the modulation effect for each VEP component. However, different VEP components also showed markedly different temporal retention patterns. Finally, participant age correlated negatively with C1 (χ2=30.4), and positively with P1 modulation (χ2=13.4), whereas P2 modulation was larger for female participants (χ2=15.4). There were no effects of either age or sex on N1 and N1b potentiation. These results provide strong support for VEP modulation, and especially N1b modulation, as a robust measure of synaptic plasticity, but underscore the need to differentiate between components, and to control for demographic confounders.
journal_name
Neuroimagejournal_title
NeuroImageauthors
Valstad M,Moberget T,Roelfs D,Slapø NB,Timpe CMF,Beck D,Richard G,Sæther LS,Haatveit B,Skaug KA,Nordvik JE,Hatlestad-Hall C,Einevoll GT,Mäki-Marttunen T,Westlye LT,Jönsson EG,Andreassen OA,Elvsåshagen Tdoi
10.1016/j.neuroimage.2020.117302subject
Has Abstractpub_date
2020-12-01 00:00:00pages
117302eissn
1053-8119issn
1095-9572pii
S1053-8119(20)30788-6journal_volume
223pub_type
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