EEP - cntreject

cntreject

Synopsis


-----------------------------------------------------------------------------
EEP 3.1  Max-Planck-Institute of Cognitive Neuroscience 1996-99
cntreject 3.10   (OSF1 V4.0 alpha)            Wed Sep 15 13:30:24 1999
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  cntreject <source cnt> <cfg> [<trg in>] [<rej out>] [-a] [-+ [<rej in>]]

options:
  -a          choose stddev parameters automatically
  -+ [<file>] add-mode, merge the new rejections with the input file

files:
  foo.cnt     ->  foo.rej
  foo.trg
  foo.rej

Configuration File

Standard Deviation Mode

;---------------------------------------------------------------------------
;Example configuration file for standard deviation REJECTion
;---------------------------------------------------------------------------

StdDev mode 200ms       ; selects StdDev mode and width of sliding window
                        ; -> see "reject_t.cfg" for other mode
Histogram scaling 0.1   ; specifies range for which histogram is computed
                        ; (may be omitted; default is 0.1 = 10% of full scale)
Cutoff point 15         ; the modal value of the distribution is mutiplied by
                        ; this factor to yield the AUTO MODE threshold
                        ; (may be omitted; default is 15)

EOGV                    ; channels to test for rejection...
   33.75                ; threshold SD (uV); if this threshold is surpassed,
                        ; the corresponding sample will be marked 'rejected'
EOGH
   33.75
FZ
   20.00

Threshold Mode

;---------------------------------------------------------------------------
;Example configuration file for Threshold REJECTion
;---------------------------------------------------------------------------

Threshold mode          ; selects Threshold mode

EOGV                    ; channels to test for rejection...
   -30                  ; low threshold (uV)
   33.75                ; high threshold (uV) if these thresholds are surpassed,
                        ; the corresponding samples will be marked 'rejected'
EOGH
   -40
   33.75
FZ
   -20
   20.00

Description(Standard Deviation Mode)

The standard deviation is calculated for a moving window at each position. This position is marked "rejected" whenever the limit is exceeded for one of the watched channels.

At discontinuities, the signal is virtually extended with constant values before the standard deviation is calculated. This means that a rapid signal change, resulting from epoching or concatenation, leads not to a rejection mark around it.