A nice artifact detection and removal walkthrough can be found at FieldTrip Artifact Documentation

This section addresses visual artifact removal using the FieldTrip toolbox FieldTrip Visual Artifact walkthrough

Load the data and define the trials as per Loading Amplipex data into fieldtrip. Once this has been done we can begin by setting up our cfg (configuration) structure and using the ft_databrowser function

cfg = data_trl.cfg;
cfg.channel     = 'all';
cfg.trials      = 'all';
cfg.latency     = 'maxperlength';
cfg.method      = 'Summary';
cfg.keepchannel = 'yes';
cfg.metric      = 'var';
cfg.alim        = [];
cfg.coninuous   = 'yes';
cfg.viewmode    = 'vertical';
cfg = ft_databrowser(cfg,data_art_rem);