Page History: Velocity Threshold Estimator Element
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Page Revision: 2016/03/24 16:55
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Velocity Threshold Estimator
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| Info |
| Category: |
Eye-tracking analysis |
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AddIn: |
Eye-tracking analysis AddIn |
| Creator: |
OkazoLab Team |
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Scope: |
Parent Event |
| Owns Snippets: |
no |
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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. | | 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. | | 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. | | String |
| AOI | | | Int32 |
| Sampling Rate | Defines the sampling rate of the tracker hardware in Hz. You can keep the zero value for auto-detection. | | 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. | | Int32 | |
| Exclusive Thresholds | Defines whether the threshold estimation is going on. Assign false to pause the estimation. | | Boolean | |
| X Velocity Threshold | Defines the saccade velocity threshold for the X-axes. | | Double | |
| Y Velocity Threshold | Defines the saccade velocity threshold for the Y-axes. | | 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. | | clSize |
| Plot Title | | | String |
| Show Axis | | | Boolean |
| Show Gridlines | | | Boolean |
| Add Screen Clone | | | Type |
| High-Quality Rendering | | | Boolean |
| Plot Theme | | | Int32 |
| Velocity Plot Settings |
| Threshold Color | | | stColor |
| Velocity Line Color | | | stColor |
| Line Thickness | | | Double |
| Saccade Label Color | | | stColor |
| Results |
| Reset Plot Now | Provides a runtime command that resets the plotted data. Assign 'true' in the snippets to invoke the command. | | 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. | | UIElement |
| Save Velocity Plot Now | Assign a filename to save the generated plot at runtime | | clDesignAction |
| Preview Velocity Plot | Open a window with the plot preview | | clDesignAction |
| Control |
| Is Enabled | If set to false the element is completely omitted when the experiment is run. | | Boolean |
| Title | Title of the element | | 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. | | Boolean |
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| Title | Title of the element. | | String |
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One-sentence description
Description
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.
Snapshots
 Snapshot 1
| Snapshot 2 |
Practical Use
Technique 1
- Step 1
- Step 2
Technique 2
- Step 1
- Step 2
// Check the trial outcome. Result and RT just other user variables
// insert code snippet here..
Notes
- Insert Notes here..
- Insert Notes here..