[Homer-users] Stim exclude

[Perdue, Katherine]

Hi Janny,

The Stim_exclude function is setting a time to exclude around a motion artifact on a trial basis, not over a run. The parameters define how close a motion artifact is allowed to be to your trigger and still have that trial included. Homer goes through and automatically labels the motion artifacts, and determines if any of them are close enough to a trigger to require the removal of that trial. So the times in tRange are not times over the whole run, but rather times relative to each trigger. This is why t1 has a suggested value that is negative.

best,
Katherine

-------------
Katherine Perdue, PhD
Research Fellow in Pediatrics
Labs of Cognitive Neuroscience
Division of Developmental Medicine
Boston Children's Hospital
Office Phone: 857-218-5214

On Mar 31, 2014, at 9:02 AM, Janny Stapel <j.c.stapel at donders.ru.nl<mailto:j.c.stapel at donders.ru.nl>>
 wrote:

Hi all,

I am a novice user of Homer, and I was wondering what the meaning is of t1 and t2 in Stim_exclude (enStimRejection). The description says you should set t2 to the stimulus duration. Say I see that in the period Tx until Tx+2 data is contaminated, so I manually select that period in the GUI. Does running Stim_exclude (t1=2 and t2=30 sec) lead to the rejection of the period Tx-2 until Tx+32? And what if one of my triggers falls within that period, is than the whole trial ignored later in the block average, or does part of my trial still end up in the block average if not the whole time segment of my trial is rejected?

Thanks in advance for your help!
Best,
Janny

Janny C. Stapel, MSc
Donders Insitute for Brain, Cognition and Behaviour
Radboud University Nijmegen
P.O. Box 9104, 6500 HE Nijmegen, the Netherlands

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