Saving Mouse X and Y

After the readmouse function detects a mouse click, Psytoolkit stores the x/y coordinates in two variables: MOUSE_X and MOUSE_Y (point 5 in the code example you linked). If you change the two lines under "readmouse 1 2000" to "set &&trackX MOUSE_X" and "set &&trackY MOUSE_Y", respectively, the code will likely do what you're hoping it will. I would have guessed this code would crash since &&trackX and &&trackY are never defined.

Note that the variables don't need to be arrays (&&) here as they will just hold one value (the coordinate), so you can change to &trackX and &trackY throughout your code. In the linked example, the code is saving a record of where the mouse was every 20ms of the trial so multiple coordinate values need to be stored.

In the code you've posted, it doesn't look like Psytoolkit is set to wait for a mouse click, but is waiting for the mouse to be over the green square. If you want Psytoolkit to wait for a click, a lowercase l should be added as the first argument: readmouse l 1 2000.

You may also find that putting all the variables in one save line will produce simpler data files (i.e., one line per trial with 5 columns). So, "save TABLEROW @1 @2 &trackX &trackY".