[FieldTrip] Tutorial "Preprocessing and analysis of spike and local field potential data": Different STAs

Hähnke, Daniel daniel.haehnke at lrz.tu-muenchen.de
Fri Jun 19 13:35:47 CEST 2015

Dear community,

I've been learning how to use FieldTrip by the series of tutorials on 
the website.

While doing the last tutorial "Preprocessing and analysis of spike and 
local field potential data" I found that my output of spike triggered 
averages (STAs) isn't the same as in the tutorials.

The plots of staPost and staPre are exactly the same for me and are 
identical to the first STA plot (staPost) in the tutorial. The only 
difference between the two STAs is cfg.latency, which is [0.3 10] for 
staPost and [-2.75 0]. If I omit cfg.latency I get the exact same values 
when running ft_spiketriggeredaverage().

This actually does make sense because the STA just averages LFPs 
'around' spikes, so there is no need to specify a latency.

I'm still curious, though, what was computed to obtain the plot for 
staPre in the tutorial. Could anyone clarify that?

Kind regards,

Daniel Hähnke

Technische Universität München
Daniel Hähnke
Institute of Neuroscience
Translational NeuroCognition Laboratory
Biedersteiner Straße 29, Bau 601
D-80802 München
Tel.: +49 89 4140 3356
daniel.haehnke at lrz.tum.de

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