Settings
There are several parameters that can be adjusted using the SEV interface which help with analysis. In order to prevent having to continually set these parameters for each instance that SEV is run or trying to remember what the parameters were for a particular occasion an initialization feature was created. At startup, SEV checks for its initialization file. If the file does not exist then preset values are loaded. When SEV is closed, the last set parameters be it the defaults that were loaded or values that were changed by the user, are saved to an initialization file in the same directory as the SEV program. The values and parameters in this file are loaded into SEV on subsequent execution.
The initialization file is overwritten (or created) each time SEV is closed. In order to keep track of which SEV parameters were used on a particular batch job, an initialization file with the batch parameters is stored in the same directory as the other batch analysis files.
Illustrated left to right
##Load EDF
Brings up Load EDF dialog box
##Event Toolbox
Brings up Event Toolbox
##Filter Toolbox
Brings up Filter Toolbox
##Compare Events Brings up Event Comparison dialog box
##General Editing (on/off) Highlights a section of a channel. If you right click on the highlighted section, it brings up options to: Plot the area in a different window, Copy to Clipboard, Show PSD, and Show MUSIC.
##Marking (on/off)
Click and drag to highlight a section of a channel for an event marker. Next to the button there is a menu to indicate the type of event (Muscle Activity, Leg Movement, Artifact, etc.) Right-clicking on the event marker brings up a menu to Change the Color, Adjust Offset, and Show Histogram (under bottom left hand corner, under EvtStats)
Such manual marking can be exported like an scored event file.
SEV has two modes of operation:
To start the SEV, make sure MATLAB is in the directory where sev.m is located. Type "sev" in the command line.
Load the EDF of your choice by going to File>Load EDF in the drop down menu. Alternatively, type "Ctrl-L" or click on the toolbar button. This brings up a list of channels. Check the box(es) of channels you wish to display.
Window: Select window of time to display, from 1 sec - 2 hr to entire study. Also can select various sleep stages (display only Stage 2 sleep).
Right-clicking in the SEV display brings up a pop-up menu.
Align channels: spaces the channels evenly along the vertical axis
Center here: centers the graph at the timepoint selected by the mouse pointer
Minor grid: Toggles on/off minor gridlines
Major grid: Toggles on/off major gridlines
Pop out: Creates MATLAB figure of display (MATLAB figure toolbox is available in this window.)
Event toolbox: Opens Event Toolbox
Take a screenshot:
Records current contents of the main display window.
Default settings: outputs to /artifacts/images folder. Saves as PNG.