[FieldTrip] About huge delay for ft_read_data to return

[Martin Dinov]

Dear all,

I'm trying to do something with realtime EEG data and I'm using the
ft_read_data function get data from BrainVision Recorder via rda2ft. In
MATLAB, calling ft_read_data seems to always take >=500ms (even for a
single sample point from data with srate of 1000Hz) which is
unacceptably slow for what I want to do. Perhaps specifying channel
indices to read only some of the data would speed it up, but I haven't
managed to get this to work. As I am trying to phase lock to the alpha
band, I need to be able to read in single sample points (after an
initial larger block that can take longer) much quicker than 500ms
(<50ms). I highly appreciate any help with this!

Thanks in advance

-- 
Martin Dinov, MSc
PhD postgraduate
Imperial College London
Computational, Cognitive and Clinical Neuroimaging Laboratory
3rd Floor, Burlington Danes Building,
Hammersmith Hospital
Du Cane Road
London
W12 0NN