Thank you Fred for pointing me to that thread!
So it's definitely only just regressing these outliers, my question then is statistically the effect same as scrubbing(removing time points when calculating functional connectivity)? since a big spike may still have motion residual effect? I'm wondering is the default CONN option is definitely superior than scrubbing, and whether CONN can provide that real scrubbing option, in case subject moves quite some volumes (especially in pediatric data), for some reason I thought scrubbed shorter time series will be cleaner for functional connectivity analysis..

Thanks!
Xiaozhen