[FieldTrip] ncs file downsampling and further processing

Skelin, Ivan ivan.skelin at uleth.ca
Tue Jun 11 03:57:55 CEST 2013


I am recording from the anesthetized rats using the two NeuroNexus silicone
probes with 8 tetrodes (32 channels) each and Neuralynx Cheetah system at
32556 Hz sampling frequency. I choose to analyze the .ncs files from 1/4 of
the channels or 1 channel per tetrode. Since the recordings took about 150
mins, the .ncs files are too bulky (0.5 GB) for the standard procedure that
the FieldTrip recommends for discontinuous data recorded using Neuralynx
system. More precisely, when I preprocess the channels separately and
subsequently run the ft_read_neuralynx_interp on them, I get the "out of
memory" error message (even when running it on only two .ncs files at the

My question is if I can first downsample all the .csc files that I want to
analyze using the ft_spikedownsample, before I run the ft_read_neuralynx_interp
on them?

Thank you very much,


Ivan Skelin, MD, PhD
Postdoctoral Fellow
Polaris Brain Dynamics Research Group
Canadian Centre for Behavioural Neuroscience
The University of Lethbridge
4401 University Dr W
Lethbridge, AB, T1K 3M4
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