draw a grating stimulus with multiple orientations through psychtoolbox

I am trying to draw a grating stimulus in psychtoolbox with multiple orientations randomly (in drift demo, am modifying the code). I have the array with the orientations in random order but when i run it, it does it all at once. what functions should i use so that the grating runs runs with multiple orientations with a waiting time of 1 sec in between the orientations.

this is what i have now:

angle= [0,pi/4,pi/2,3*pi/4, pi, 5*pi/4, 3*pi/2, 7*pi/4];
    D = rad2deg(angle);
    pause('on')
         for i=1:numFrames
            phase=(i/numFrames)*2*pi;
            % grating
            [x,y]=meshgrid(-300:300,-300:300);
            %         angle=30*pi/180; % 30 deg orientation.

          msize = numel(angle);
         or= D(randperm(msize, 1))

              f=0.09*2*pi; % cycles/pixel
              a=cos(or)*f;
              b=sin(or)*f;
              m=exp(-((x/90).^2)-((y/90).^2)).*sin(a(:,1).*x+b(:,1).*y+phase)

Answer 1

[Walter Roberson]

pause(1)

[Anwesha]

its not working with the pause command. all the orientations are running at the same time and not one after the other

[Walter Roberson]

Difficult to say. You have only posted partial code. You are missing an end statement and you are missing the graphics.

[Anwesha]

i wil have 8 orientations that should run for 2 secs and a blank period of 1sec. I will also have 5 temporal frequencies. but first i want to run 8 different randomised orientations for 2 sec.

function DriftDemo

      white=WhiteIndex(screenNumber);
      black=BlackIndex(screenNumber);

      gray=round((white+black)/2);

      if gray == white
          gray=white / 2;
      end

      inc=white-gray;

      w=Screen('OpenWindow',screenNumber, gray);

      angle= [0,pi/4,pi/2,3*pi/4, pi, 5*pi/4, 3*pi/2, 7*pi/4];
      D = rad2deg(angle);
  %     pause('on')
           for i=1:numFrames
              phase=(i/numFrames)*2*pi;
              % grating
              [x,y]=meshgrid(-300:300,-300:300);
              %         angle=30*pi/180; % 30 deg orientation.

          msize = numel(angle);
         or= D(randperm(msize, 1));

              f=0.09*2*pi; % cycles/pixel
              a=cos(or)*f;
              b=sin(or)*f;
              m=exp(-((x/90).^2)-((y/90).^2)).*sin(a(:,1).*x+b(:,1).*y+phase);
  %                     m=exp(-((x/90).^2)-((y/90).^2)).*sin(a*x+b*y+phase);

              tex(i)=Screen('MakeTexture', w, round(gray+inc*m)); %#ok<AGROW>
           end
             pause(1)

      movieDurationSecs=100;
      frameRate=Screen('FrameRate',screenNumber);

      if frameRate == 0
          frameRate=60;
      end

      movieDurationFrames=round(movieDurationSecs * frameRate);
      movieFrameIndices=mod(0:(movieDurationFrames-1), numFrames) + 1;

      priorityLevel=MaxPriority(w);
      Priority(priorityLevel);

      for i=1:movieDurationFrames
          % Draw image:
          Screen('DrawTexture', w, tex(movieFrameIndices(i)));

          Screen('Flip', w);
      end

      Priority(0);

      Screen('Close');

      sca;

catch

      Priority(0);
      psychrethrow(psychlasterror);
  end

[Walter Roberson]

The pause(1) should be before the end on the line above it.

[Anwesha]

still not working...its a jumbled up grating with all orientations

[Anwesha]

i am trying to call with a function and it works.

function RandomizeOrientations
angle= [0,pi/4,pi/2,3*pi/4, pi, 5*pi/4, 3*pi/2, 7*pi/4];
       D = rad2deg(angle);
        msize = numel(angle);
 for i =1:msize
 or= D(randperm(msize, 1));
  DriftDemo2(or,1,0.05,1,400)
end

now the problem is that before running a different orientation each time the psychtoolbox closes and starts new.

I would like to run the 8 orientations for example 2mins with an interstimulus interval of 2 secs.. how do i go ahead..

    end

[Anwesha]

any suggestions??

[Walter Roberson]

Not from me. I recently got a new computer and have not set up Psychtoolbox on it as doing so is a bit of a nuisance to tie into the retrace properly. It is not a program that I use myself, just something I have encountered enough times over the years to sometimes be able to answer minor questions about.

[Anwesha]

no issues, thanks though