Testing dot motion on the Display++ — you need to download and install my `opticka` toolbox from https://github.com/iandol/opticka/archive/master.zip for this to run…

dotstest.m

% install https://github.com/iandol/opticka/archive/master.zip first
clear s d
% this sets up the PTB screen
s = screenManager('verbose',false,'blend',true,...
	'bitDepth','FloatingPoint32Bit',... % try FloatingPoint32Bit EnableBits++Mono++Output EnableBits++Bits++Output
	'debug',false,... % don't check for dropped frames etc.
	'windowed', [],... %empty is full screen
	'screen', [],... %empty chooses the highest avilable screen
	'srcMode','GL_SRC_ALPHA', 'dstMode', 'GL_ONE_MINUS_SRC_ALPHA',...
	'backgroundColour',[0.5 0.5 0.5]); %change background colour here
prepareScreen(s);
s.disableSyncTests = true; %used only for development!

%create a dots stimulus
d			= dotsStimulus;
d.coherence		= 1;
d.density		= 1;
d.speed			= 25; % speed is critical to reveal the artifacts
d.size			= 25;
d.dotSize		= 0.2;
d.colourType		= 'randomBW'; %try 'simple', 'randomBW' and 'binary'
d.colour		= [0.75 0.75 0.75]; %if colourType is simple use this colour

%run this stimulus
runTime			= 25;
forceFullscreen		= true;
d.run([], runTime, s, forceFullscreen)