[FieldTrip] help with topoplot_TFR

Payashi Garry payashi.garry at seh.ox.ac.uk
Wed Jan 28 16:32:51 CET 2015


Dear Fieldtrip community, 

My name is Payashi Garry and I am working in the Nuffield Department of Clinical Neurosciences in the University of Oxford. I am analysing some continuous EEG data that we have measured from our Neuro-Intensive Care unit patients. We are interested in using quantitative EEG measures to assess whether these can be used to detect cerebral ischaemia.

I have performed time frequency analysis using ft_freqanalysis. I have then been usig ft_topoplotTFR to visualise the results with no problems. However, one of the parameters we are investigating is the change in alpha/delta ratio. I was wondering if it would be possible to create topographic maps of the alpha/delta ratio for a particular time period (i.e. alpha power/delta power) using ft_topoplotTFR? 

At the moment I am generating topographic maps for alpha and delta power using the following commands:

cfg=[];
cfg.baselinetype = 'absolute';
cfg.xlim = [10 2500];
cfg.ylim = [1 4];
cfg.zlim = [0 100];
cfg.colorbar = 'yes';
figure
ft_topoplotTFR(cfg, freq_continuous)
title('delta power prenitrite', 'FontSize', 36, 'FontName', 'Arial')

with freq_continuous being my time/frequency/channel data. 

I would be very grateful for any advice on this, and would be happy to supply more information if needed. 

Many thanks
Best wishes
Payashi

****
Dr Payashi Garry MB BChir FRCA
Specialty Registrar in Anaesthetics and BRC Research Fellow
Nuffield Department of Clinical Neurosciences
John Radcliffe Hospital
Oxford OX3 9DU
Tel: 01865 572878






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