Threshold s are Signals Too
Thresholds are also signals
* Each threshold is linked to a raw signal, forming a signal-threshold pair.
* As with all other signal types, the key to modifying  threshold signals is to first HIGHLIGHT the screen object containing the signal-threshold pair.


Three Ways of Modifying Threshold Signals
1. HIGHLIGHT and adjust the Adjust Threshold Button on the Signal Control Toolbar.
2. HIGHLIGHT and CLICK-AND-DRAG the threshold signal on a Signal Bar or Line Graph.
3. HIGHLIGHT and click the up-down arrows on the TH ADJ Button on the MASTER CONTROL DISPLAY.

THRESHOLDS ARE THE KEY TO 'FEEDBACK: Studies on human learning and performance indicate that new skills are learned fastest if the tasks are shaped and if goals are used to fine-tune the desired response. While a continuous tone from a physiological signal is informative, the information is graded. Adding thresholds allows the trainer to specify particular levels of performance. More practically it allows the trainer to make the task more or less difficult depending on performance.
Physiolab has several ways of adjusting thresholds. Make sure you understand and practice these threshold-adjustment techniques before attempting training.

FINE_TUNING_THRESHOLDS

This is a fool-proof way of adjusting a threshold. It always works. The only thing to remember is to click to highlight, then click the icon.
Now if your computer graphics processor is very fast, you can skip using this button, and use the 'hand' drag-and-drop method, shown next.

Select the signal  threshold you wish to modify by clicking on the tiny colored square next to the name of the signal within the top of the display.

A white dot in the center of the square indicates that particular signal is selected.  Use the Signal Control Toolbar to modify the selected signal. If the signal names are not clickable, it means that the signals have the same scale and are locked together so that the signal controls modify all signals together.
Adjust Threshold button

Highlight and click on the Adjust Threshold Button
Use this button to change threshold levles.  This button will modify only one threshold value at a time. 

To  select an individual threshold  signal from a  signal-threshold-pair screen, click on the display. The display will become highlighted with light blue to indicate it has been selected and that the Signal Control buttons have been assigned to it.  Modify the signal threshold using the Adjust Threshold icons to the left.

Clicking on the Adjust Threshold button  is enabled if “THR” is in the signal name of one of the available signals for a particular display.  This button brings up the Threshold Control window. 

An empty checkbox indicates that Auto Threshold is OFF. To turn this feature ON, click in the checkbox next to “Enable Auto Threshold”. To manually set the threshold, click on the check mark next to “Enable Auto Threshold” in order to deselect it.  Click on the Down/Up arrows next to the “Level” box or type a numerical value in the box.  Close the control box by clicking on the small x.

There is another way to change Thresholds - click and drag.  You can drag and drop the threshold line on the display screen. The cursor changes to a 'hand':

Place the cursor in the display area and click the mouse once to activate the drag-and-drop feature for that display. As you move the cursor over the threshold line, a hand appears. Hold down the left mouse button when the hand appears and drag the threshold line up and down on the screen, releasing the button at the point where you want the threshold line to stay.

There is another way to change Thresholds - use up-down arrow buttons.  This only works for MASTER CONTROL DISPLAYS.

Find the Master Control Displays and click on Threshold Adjust. Click on the up-down arrows to fine-tune the threshold.

NOTE: The 'THRESHOLD LINE' does NOT move. This is a different kind of screen. When you adjust thresholds, the signal moves. Why? This assures you that at a glance you can always see the threshold.

PERCENT THRESHOLD: These displays also prsent a percent threshold readuot as a number on the bottom right panel.

AUTOTHRESHOLD BUTTON: The bottom line is to be very careful with auto-threshold. When enabled, it will automatically adjust the threshold about once every few seconds. There is currently no way to adjust this. We include it here only as a convience while setting a manual threshold. It is a set-up trick. If your signal is very large or very small, BRIEFLY enable auto-threshold. The signal will stabilize to fill the screen. Immediately disable autothreshold. Then fine tune manually.