Optic Flow Random Dot Patterns

Hello everyone,

I have managed to code stimuli using psychtoolbox that displays a motion coherence paradigm for translational moving dots. However, I would also like to code radial and rotation patterns but I don't know the maths for this!

I was wondering if anyone could help me to adjust my code to make the dots move inward/outward and clockwise/anticlockwise.

At the moment, my dots move position by using this code:

dx = speed*sin(direction*pi)/frameRate;

dy = -speed*cos(direction*pi)/frameRate;

And (in case it's helpful) they remain in an aperture using this code:

x(x<lefBorder) = x(x<lefBorder) + apSize(1);

x(x>rigBorder) = x(x>rigBorder) - apSize(1);

y(y<botBorder) = y(y<botBorder) + apSize(2);

y(y>topborder) = y(y>topBorder) - apSize(2);

I hope one of you clever people will be able to help me out! Thank you, Sam

Answer 1

[sinlin ray]

Maybe i can help you. you should send your code to me. i am a neuroscience phd student. My email : [e-mail]