Data epochs are extracted from the filtered, transposed data based
on a timing file, which is created when opening the raw data file. You
can manually this textfile before running the epoch extraction to
exclude specific trial from the extraction.
After you push the "Resume analsis"-button, you can select a number
of data points to extract before (Pretrigger) and after (Posttrigger)
the onset of each event listed in your timing file (dialog shown
below). Only the "Start" column in the timing file is used, the "End"
column is ignored.
You can extract only a subset of conditiong by activating the "Use only"-radiobutton and entering condition numbers to extract in the adjacent text field.
You can select to ignore specific events (for instance calibration trials for the RAAA procedure) by activating the "Use all events but ignore"-radiobutton and entering condition numbers in the adjacent text field.
You can subdivide trials of each condition in equally sized parts by
activating the "Subdivide events in N parts"-checkbox and selecting the
number of subdivision on the adjacent spinbox. Conditions will be
numbered by appending part numbers to the condition name, e.g.
condition 4 subdivided in 3 parts will result in the conditions 41, 42,
After pressing OK, EMEGS extracts the data epochs, saves them to
diskfile, and displays first extracted epoch. This should look
something similar to this: