A static pattern of one or more dots. This uses Psychtoolbox Screen('DrawDots'), which draws dots that are limited in size. For larger circles, see element type circle.

(Transparency artifacts)

In the unusual case that you draw multiple dots with the same element and they overlap and you use transparency for one or more of them (property color below), you may need to set backColor = <cds>"opaque"<cds> for accurate display.

▸ Ends on its own?

If an element can end on its own, you don't need to set end conditions for it in property end (unless you want it to maybe end earlier).

No—runs until a condition you set in property end.

Input properties

Adjustable properties

You can vary or allow the subject to adjust the following input properties of an object of this type in real time when it's running. If you need to make other properties adjustable, you can edit the element type code—see Element Type Programming Manual.





Default: one dot at element position

A 2-column matrix setting dot centers, with rows corresponding to dots and columns to [x y] coordinates (deg). Positions are relative to element position, which you can set in position (default relative to screen center). If dots overlap then they are layered front-to-back in the order you specify them. If you show multiple dots then for each of the properties below you can set one value for all of them, or you can set different values for different dots using a vector or matrix (see property).


Default: 0.2 deg

A number setting dot diameter (deg). Or a 1×n vector for different diameters for different dots.


Default: white

A 1×3 RGB vector with numbers between 0–1 setting dot color. You can also use a 1×4 RGBA vector to give the color transparency. Or an n×3/4 matrix for different colors for different dots.


Default: 2 -> circles, prioritizing speed

A number corresponding to Psychtoolbox Screen('DrawDots') input dot_type, setting dot shape and draw method. Note that Psychtoolbox values are between 0–4 but this property is between 1–5.

Input properties all visual elements have


Input properties all adjuster elements have


Input properties all objects have


Record properties

PsychBench uses record properties to record information during experiments. You can't set record properties but you can see them in experiment results by listing them input property report.