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Page Revision: 2012/07/01 21:02

The element allows/is capable of doing something in experiments

Table of Contents [Hide/Show] Description Snapshots Practical Use     Technique 1     Technique 2 Notes Properties     Generic Properties

Description ¶

Random-dot motion element generates a sequence of 2D frames that can make up a random dot motion patten. The selected fraction of all dots can be set to move in a single direction, thus producing a coherent motion. Some examples how this stimulus looks like during the experiment can be found here.

Snapshots ¶

Example of Random-dot motion element

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 ¶

Properties ¶

Generic Properties ¶

Name	Description	Attributes	Value Type	Proxy Reflex
Dot Pattern
Dot Density	The requested proportion of the all visible dots to the total number of dots in element's rendering area.		Double
Lookup Map Size	The size of the lookup map. Use value larger than the rendering area of the given element. Larger lookup map increase non-periodicity of the dot motion		clSize
Allow Dot Clusters	Indicates whether clusters of two or more dots are allowed. If false, all visible dots will be isolated but the actual dot density may be decreased.		Boolean
Lookup index	Index of the random lookup map. If value is 0 then an automatic time dependent index is used. Otherwise, the value has to be a positive integer.		Int32
Background color	Background color such that its brightness (B) is used to define the luminance of element's background.		stColor
Dot color	Foreground color such that its brightness (B) is used to define dot luminance		stColor
Show Lookup Borders	Indicates whether the left and top borders of the lookup map are shown being superimposed over the dots. Use for debugging purposes.		Boolean
Motion
Motion Coherence	Proportion of the dots coherently moving in a single direction		Double
Motion Step	The pixel distance of one step of the coherent motion. Can be less than 1 for slow motion		Double
Motion Angle	Direction of the coherent motion in degrees (0..360).		Double
Runtime
Noise Lookup	Lookup position on the map A representing the noise dots		Point
Motion Lookup	Lookup position on the map B containing coherently moving dots		Point
Make Noise	Runtime action.		Boolean
Make Motion	Runtime action.		Boolean

+=== Properties inherited from clVisualElement ===

Name	Description	Constraints	Value Type	Upon Runtime Change
VISUAL APPEARANCE
Alpha Masking	Defines whether the visual content rendered by this element will be used as an opacity mask which is applied onto the given event surface. The active opacity mask allows one to expose pixels of the parent event surface through a solid background of the given event. If the value is true, the darker pixels of the content will make more transparent holes on the entire event surface.	Design Time..	Boolean
AntiAliasing	If true, the rendered content will be anti-aliased for smoother visual appearance. If false, rendering will be authentic to its source, e.g. a bitmap.		Boolean	Visual Update..
Position	Defines the position of the element viewport on the screen. The position can be set in any of three coordinate systems: a) pixels, b) polar, c) central.		clPoint	Visual Update..
Size	Defines the size of the element viewport on the screen. The size can be set in any of three coordinate systems: a) pixels, b) visual degrees, c) 'relative-to-screen' size.		clSize	Visual Update..
Z Order	Indicates the current depth order of the element viewport on the surface of the parent event. The greatest number corresponds to the top position. The order can be changed by moving the element up and down in the element list.	Status..	Int32
Pivot Point	Defines the pivot point (coordinate and the rotation centers) within the element viewport.		stAlignment or Int32	Visual Update..
Visible	Defines whether the element is currently visible on the event surface. The property is convenient for switching visual content on and off.		Boolean	Visual Update..
Rotation	Defines the rotation angle (in degrees) of element viewport relative to the its pivot point.		Double in the range 0..360	Visual Update..
EFFECTS
Transparent Color	The color of the original pixels of rendered content that will be set as transparent.		stColor	Visual Update..
Transparency Tolerance	Tolerance ratio for choosing colors that become transparent. Zero means that effect is not applied, 1 denotes that all colors will become trasparent.		Int32, range (0..100)	Visual Update..
Color Mask	Produces a multiplicative combination of the original pixels and the selected mask color (except the alpha channel). The effect emulates a look through a colored glass. White or transparent mask color doesn't change the original pixels.		stColor	Visual Update..
Opacity	Opacity of the rendered content.		Int32, range (0..100)	Visual Update..
Contrast	Contrast of the rendered content.		Int32, range (-100..100)	Visual Update..
Brightness	Defines the brighness of the rendered content.		Int32, range (-100..100)	Visual Update..
Saturation	Saturation of the rendered content.		Double	Visual Update..
Pixelation	Defines the pixel scale of the rendering.		Int32, range (0..100)	Visual Update..
Blurring	The radius used in the gaussian blur of rendered content, as a pixel-based factor. The default is 0 which means no blurring.		Int32	Visual Update..
POSITIONAL JITTER
Reset Jitter	Set to true at runtime to reset the current positional jitter.	Runtime Command..	Boolean, set true for action	Visual Update..
Current Jitter	Jitter range, in pixels (non inclusive).	.	clSize	Visual Update..
Jitter Range	Jitter range, centered at the original position of the element.	.	clSize	Visual Update..

+=== 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