Page History: Velocity Threshold Estimator Element

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Page Revision: 2016/05/05 19:45

	Velocity Threshold Estimator
Info
Category:	Eye-tracking analysis		AddIn:	Eye-tracking analysis AddIn
Creator:	OkazoLab Team		Scope:	Parent Event
Owns Snippets:	no		Usage:	Background processing

The Velocity Threshold Estimator element automatically estimates the saccade threshold over the current eye-tracking data and its noise. The estimated threshold can be then used by other eye-tracking analysis elements in an experiment.

Actions aligned with epochs of the parent event ¶

Epoch	Actions
After experiment onset	The element ...
Event rendered
Before event onset
After event onset
Control loop step	The element ...
Before event offset
Before experiment offset	The element ...

Properties ¶

Generic Properties ¶

Name	Property description	Constraints	Type	Upon change
Estimator Parameters
Is Estimating	Defines whether the threshold estimation is going on. Assign false to pause the estimation.	Normal..	Boolean
Lambda	Defines the multiplication factor for the standard deviation of the collected velocity distribution. The result of the multiplication is used as the velocity threshold.	Normal..	Double
Gaze Processing
Radar Provider	Defines which of the radar providers is used for positional input in this event. In each experiment, the radar providers includes the system mouse and all tracker elements. The selected radar provider controls the Radar Point property and input to the AOI elements in this event. When 'Auto' is chosen, the first tracker element is picked up. If there are no tracker elements, the system mouse is used by default.	Design Time..	String
AOI		Normal..	Int32
Sampling Rate	Defines the sampling rate of the tracker hardware in Hz. You can keep the zero value for auto-detection.	Normal..	Double
Analysis Window Size	Defines the size of a moving analysis window in samples. The value also defines the data range in all generated plots.	Design Time..	Int32
Exclusive Thresholds	Defines whether the threshold estimation is going on. Assign false to pause the estimation.	Normal..	Boolean
X Velocity Threshold	Defines the saccade velocity threshold for the X-axes.	Normal..	Double
Y Velocity Threshold	Defines the saccade velocity threshold for the Y-axes.	Normal..	Double
General Plot Settings
Rendering Size	Defines the size of the generated XAML staircase plot in pixels. The plot is automatically stretched on rendering, but a larger rendering size improves the chart quality with some cost in performance. The rendering size is also used as the resulting image resolution, when the chart is saved into a file.	Design Time..	clSize
Plot Title		Normal..	String
Show Axis		Normal..	Boolean
Show Gridlines		Normal..	Boolean
Add Screen Clone		Design Time..	Type
High-Quality Rendering		Normal..	Boolean
Plot Theme		Normal..	Int32
Velocity Plot Settings
Threshold Color		Normal..	stColor
Velocity Line Color		Normal..	stColor
Line Thickness		Normal..	Double
Saccade Label Color		Normal..	stColor
Results
Reset Plot Now	Provides a runtime command that resets the plotted data. Assign 'true' in the snippets to invoke the command.	WriteOnly..	Boolean
XAML Velocity Plot	Returns a live XAML control that can be used for direct binding to the Content property of the XAML ContentControl element, e.g. ContentControl with a generated staircase plot can be added to the status screen or to the XAML Layout element.	Status..	UIElement
Save Velocity Plot Now	Assign a filename to save the generated plot at runtime	Normal..	clDesignAction
Preview Velocity Plot	Open a window with the plot preview	Design Time..	clDesignAction
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element	Design Time..	String

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element.	Design Time..	String

¶

Description ¶

Snapshots ¶

Snapshot 1

Snapshot 2

Practical Use ¶

Technique 1 ¶

1. Step 1
2. Step 2
   

Technique 2 ¶

1. Step 1
2. Step 2
   

 // Check the trial outcome. Result and RT just other user variables
// insert code snippet here..

Notes ¶

• Insert Notes here..
• Insert Notes here..