Hi BST experts,
When I display time series graphs, the zero point looks to be positioned around where I expect to see activity occurring at 100ms - i.e., the timing looks to be lagging by around 100ms. Passive auditory response data were obtained with whole cortex 160 channel MEG (coaxial, first order gradiometers - Model PQ1160R-N2, KIT), and epoched at -100 to 600ms around events. The plot below is for grand averages (2 groups x 2 conditions) with arrows indicating the timing issue. The delay occurs with individual plots as well. I'm not sure if this is an averaging error? Epoching error? Or something else. There was no systematic stimulus delay and I'm not sure of the precise timing difference, so manually adding a time offset is not a possibility. I'm hoping someone can help resolve this issue so I can make sure the final averages used in analysis are accurate.
Many thanks in advance.