FT_SPIKEDOWNSAMPLE

Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_spikedownsample”.

  FT_SPIKEDOWNSAMPLE takes electrophysiological data that was continuoudly
  sampled at 32KHz and preprocesses and downsamples it to obtain the LFP
  data, which can subsequently be processed in more detail.
 
  Use as
    [cfg] = ft_spikedownsample(cfg)
 
  The configuration should contain
    cfg.dataset             = string with the input dataset
    cfg.output              = string with the output dataset (default is determined automatic)
    cfg.dataformat          = string with the output dataset format, see WRITE_DATA
    cfg.channel             = Nx1 cell-array with selection of channels (default = 'all'),
                              see FT_CHANNELSELECTION for details
    cfg.fsample             = desired sampling frequency in Hz (default = 1000)
    cfg.method              = resampling method, can be 'resample', 'decimate' or 'downsample'
    cfg.timestampdefinition = 'orig' or 'sample'
    cfg.channelprefix       = string, will be added to channel name, e.g. 'lfp' -> 'lfp_ncs001' (default = [])
    cfg.calibration         = optional scaling factor to apply to the data to convert it in uV, see below
 
  The Neuralynx acquisition system at the FCDC in Nijmegen makes use of
  Plexon headstages which have a amplification of 20x. The data that is
  written by the Neuralynx acquisition software therefore is 20x larger
  than the true microvolt values. When operating FT_SPIKEDOWNSAMPLE on the
  *.ncs files that are recorded with the Neuralynx Cheetah software, the
  calibration should be set to 1/20. The raw dma file (*.nrd) and the
  splitted DMA files contains AD values that are not scaled in uV and
  require an additional factor of 64x. If you operate FT_SPIKEDOWNSAMPLE  on
  raw dma files or on splitted DMA files, the calibration should be set to
  1/(64*20).
 
  The default is to process the full dataset. You can select a latency range with
    cfg.latency          = [begin end], default is [0 inf]
  or you can specify multiple latency segments with
    cfg.latency          = [b1 e1; b2 e2; ...]
 
  Furthermore, the configuration can contain the following preprocessing options
    cfg.preproc.lpfilter      = 'no' or 'yes'  lowpass filter
    cfg.preproc.hpfilter      = 'no' or 'yes'  highpass filter
    cfg.preproc.bpfilter      = 'no' or 'yes'  bandpass filter
    cfg.preproc.lnfilter      = 'no' or 'yes'  line noise removal using notch filter
    cfg.preproc.dftfilter     = 'no' or 'yes'  line noise removal using discrete fourier transform
    cfg.preproc.medianfilter  = 'no' or 'yes'  jump preserving median filter
    cfg.preproc.lpfreq        = lowpass  frequency in Hz
    cfg.preproc.hpfreq        = highpass frequency in Hz
    cfg.preproc.bpfreq        = bandpass frequency range, specified as [low high] in Hz
    cfg.preproc.lnfreq        = line noise frequency in Hz, default 50Hz
    cfg.preproc.lpfiltord     = lowpass  filter order
    cfg.preproc.hpfiltord     = highpass filter order
    cfg.preproc.bpfiltord     = bandpass filter order
    cfg.preproc.lnfiltord     = line noise notch filter order
    cfg.preproc.medianfiltord = length of median filter
    cfg.preproc.lpfilttype    = digital filter type, 'but' (default) or 'fir'
    cfg.preproc.hpfilttype    = digital filter type, 'but' (default) or 'fir'
    cfg.preproc.bpfilttype    = digital filter type, 'but' (default) or 'fir'
    cfg.preproc.lpfiltdir     = filter direction, 'twopass' (default) or 'onepass'
    cfg.preproc.hpfiltdir     = filter direction, 'twopass' (default) or 'onepass'
    cfg.preproc.bpfiltdir     = filter direction, 'twopass' (default) or 'onepass'
    cfg.preproc.detrend       = 'no' or 'yes'
    cfg.preproc.demean        = 'no' or 'yes'
    cfg.preproc.baselinewindow = [begin end] in seconds, the default is the complete trial
    cfg.preproc.hilbert       = 'no' or 'yes'
    cfg.preproc.rectify       = 'no' or 'yes'

reference/ft_spikedownsample.txt · Last modified: 2016/08/17 23:02 (external edit)

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