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Multi_N_Back.m
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Multi_N_Back.m
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function data = Multi_N_Back(subID,mode,numBack,practice)
RandStream.setDefaultStream(RandStream('mt19937ar','seed',sum(100*clock)));
AssertOpenGL;
if(~exist('practice','var') || isempty(practice))
practice = false;
end
D_BACKGROUND_COLOR = [128, 128, 128]; % Gray
D_TEXT_COLOR = [255, 255, 255]; % White
D_STIM_FONT = 'Times New Roman';
D_STIM_FONTSIZE = 36;
D_PROB_POSITIVE_TRIAL = 0.5;
if(~practice)
D_NUM_TRIALS = 100; % Total trials will be this + numBack
D_ISI = 1.0; % Inter-stimulus interval, "blank time"
D_STIM_TIME = 0.5; % Stimulus duration
D_RESP_TIME = 2.0; % Response window
% Trial duration = D_ISI + D_RESP_TIME
else
D_NUM_TRIALS = 10;
D_ISI = 2.0;
D_STIM_TIME = 1.5;
D_RESP_TIME = 3.0;
end
D_WINDOWED = false; % If true, will run experiment in a window
D_DEV = false; % If true, will bypass sync tests (bad!) and enable
% other silly things.
D_HEADERS = {'Subject ID','Mode','Trial Number','Stimulus','Location Index', ...
'Location X','Location Y','Trial Type','Response','Feedback','Response Time'};
if(D_WINDOWED)
D_SCREEN_NUM = 0;
screen_rect = Screen('Rect',0);
[mx,my] = RectCenter(screen_rect);
D_WINDOW_WIDTH = 800;
D_WINDOW_HEIGHT = 600;
D_WINDOW_SIZE = [mx-D_WINDOW_WIDTH/2,my-D_WINDOW_HEIGHT/2, ...
mx+D_WINDOW_WIDTH/2,my+D_WINDOW_HEIGHT/2];
else
screens = Screen('Screens');
D_SCREEN_NUM = max(screens);
D_WINDOW_SIZE = []; % Full screen
end
D_VERBAL_MODE = 1;
D_SPATIAL_MODE = 2;
D_STIM = {'A','B','C','D','E','G','H','K','L','M','N','P', ...
'Q','R','S','T','V','W','X','Y','Z'}; % 21 Letters
D_STIM_TYPE = 'Letters';
% D_STIM = {'Alpha','Bravo','Charlie','Delta','Echo','Golf','Hotel', ...
% 'Kilo','Lima','Mike','November','Papa','Quebec','Romeo', ...
% 'Sierra','Tango','Victor','Whiskey','X-ray','Yankee','Zulu'};
% D_STIM_TYPE = 'Phonetic Letters';
% D_STIM = {'CAT','PEN','CAR','DOOR','MOP','BAG','FORK', ...
% 'OPEN','HUG','TAKE','STOP','READ','LOOK','WISH', ...
% 'SOFT','RED','BIG','EASY','DRY','GOOD','NEW'}; % 21 Words:
% 7 nouns, 7 verbs, 7 adjectives
% D_STIM_TYPE = 'Words';
D_LOCATIONS = []; % Location definitions deferred until we have a PTB
% window
% Marker codes
evBlockStartBase = 100;
evBlockEndBase = 200;
evLoadingStim = 10;
evNegativeStim = 11;
evPositiveStim = 12;
evRespTimeout = 20;
evRespNegative = 21;
evRespPositive = 22;
evRespInvalid = 23;
if(~exist('subID','var'))
subID = inputdlg('Enter subject ID','Subject Information');
if(isempty(subID))
disp('Aborting...');
return;
end
subID = subID{1};
end
if(~exist('mode','var') || isempty(mode))
mode = questdlg('Select a mode:', ...
'Mode selection', D_STIM_TYPE, 'Locations', 'Both', D_STIM_TYPE);
if(isempty(mode))
disp('Aborting...');
return;
end
end
if(~exist('numBack','var') || isempty(numBack))
numBack = 2;
disp(['parameter ''numBack'' not specified; default to ' ...
num2str(numBack)]);
end
if(D_DEV)
Screen('Preference', 'SkipSyncTests',1);
end
try
if(D_DEV)
ListenChar(1);
else
ListenChar(2);
HideCursor;
end
screens = Screen('Screens');
[windowPtr,rect] = Screen('OpenWindow',D_SCREEN_NUM, ...
D_BACKGROUND_COLOR, D_WINDOW_SIZE);
[scrWidth, scrHeight] = Screen('WindowSize',windowPtr);
Screen('BlendFunction',windowPtr,GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
Screen('TextSize',windowPtr,D_STIM_FONTSIZE);
Screen('TextFont',windowPtr,D_STIM_FONT);
% Load correct/incorrect graphics
rCorrect = [];
rIncorrect = [];
try
[rCorrect,mCorrect,aCorrect] = imread('Correct.png');
[rIncorrect,mIncorrect,aIncorrect] = imread('Incorrect.png');
end
if(~isempty(rCorrect) && ~isempty(rIncorrect))
bFeedbackGFX = true;
tCorrect = Screen('MakeTexture',windowPtr,cat(3,rCorrect,aCorrect));
tIncorrect = Screen('MakeTexture',windowPtr,cat(3,rIncorrect,aIncorrect));
else
bFeedbackGFX = false;
end
% Define locations
[mx,my] = RectCenter(rect);
D_LOCATIONS = round([ ... % 21 Locations; 3x7 grid
mx/4, my/2; mx/4, my; mx/4, 3*my/2; ...
mx/2, my/2; mx/2, my; mx/2, 3*my/2; ...
3*mx/4, my/2; 3*mx/4, my; 3*mx/4, 3*my/2; ...
mx, my/2; mx, my; mx, 3*my/2; ...
5*mx/4, my/2; 5*mx/4, my; 5*mx/4, 3*my/2; ...
3*mx/2, my/2; 3*mx/2, my; 3*mx/2, 3*my/2; ...
7*mx/4, my/2; 7*mx/4, my; 7*mx/4, 3*my/2]);
% Define offsets for stimuli
D_OFFSETS = [];
n = 1;
for stim = D_STIM
rect = Screen('TextBounds',windowPtr,stim{1});
[D_OFFSETS(n,1),D_OFFSETS(n,2)] = RectCenter(rect);
n = n + 1;
end
D_OFFSETS = D_OFFSETS * -1;
% Instructions
showInstructions(windowPtr);
trialHist = cell(D_NUM_TRIALS + numBack,1);
data = cell(D_NUM_TRIALS + numBack + 1,length(D_HEADERS));
for n=1:length(D_HEADERS)
data{1,n} = D_HEADERS{n};
end
lastStim = 0;
switch(mode)
case D_STIM_TYPE
evConditionTerm = 10;
case 'Locations'
evConditionTerm = 20;
case 'Both'
evConditionTerm = 30;
end
evBlockStart = evBlockStartBase + ...
evConditionTerm + numBack;
sendEvent(evBlockStart);
for trialNum=1:D_NUM_TRIALS + numBack
% Populate this trial and record in history
x = rand();
if(trialNum <= numBack || x > D_PROB_POSITIVE_TRIAL)
bReroll = true;
while(bReroll)
trialHist{trialNum} = [ ...
randi(length(D_STIM)), ...
randi(length(D_LOCATIONS))];
if(trialNum <= numBack)
trialType = 'loading';
bReroll = false;
elseif(~isequal(mode,'Both'))
trialType = 'negative';
switch mode
case D_STIM_TYPE
if(~isequal(trialHist{trialNum}(1),trialHist{trialNum - numBack}(1)))
bReroll = false;
end
case 'Locations'
if(~isequal(trialHist{trialNum}(2),trialHist{trialNum - numBack}(2)))
bReroll = false;
end
end
else
y = rand();
if(y > .75) % 25% chance that dim A is random but dim B is the same
trialHist{trialNum} = [ ...
randi(length(D_STIM)), ...
trialHist{trialNum - numBack}(2)];
if(~isequal(trialHist{trialNum}(1),trialHist{trialNum - numBack}(1)))
bReroll = false;
end
elseif(y > .5) % 25% chance that dim B is random but dim A is the same
trialHist{trialNum} = [ ...
trialHist{trialNum - numBack}(1), ...
randi(length(D_LOCATIONS))];
if(~isequal(trialHist{trialNum}(2),trialHist{trialNum - numBack}(2)))
bReroll = false;
end
end
trialType = 'negative';
end
end
else % Positive trial
trialHist{trialNum} = trialHist{trialNum - numBack};
trialType = 'positive';
switch mode
case D_STIM_TYPE
trialHist{trialNum}(2) = randi(length(D_LOCATIONS));
case 'Locations'
trialHist{trialNum}(1) = randi(length(D_STIM));
case 'Both'
% Do nothing
otherwise
exBadMode = MException( ...
'Multi_N_Back:badMode','Bad mode: %s',mode);
throw(exBadMode);
end
end
% Render this trial
stim = D_STIM{trialHist{trialNum}(1)};
offset = D_OFFSETS(trialHist{trialNum}(1),:);
location = D_LOCATIONS(trialHist{trialNum}(2),:);
DrawFormattedText(windowPtr, [num2str(numBack) '-back: ' mode], ...
'center',0,D_TEXT_COLOR);
Screen('DrawText', windowPtr, stim, ...
location(1) + offset(1), location(2) + offset(2), ...
D_TEXT_COLOR);
if(lastStim)
[VBLTimestamp lastStim] = ...
Screen('Flip',windowPtr,lastStim + D_RESP_TIME + D_ISI);
else % ASAP
[VBLTimestamp lastStim] = ...
Screen('Flip',windowPtr);
end
% Send onset marker
switch trialType
case 'loading'
sendEvent(evLoadingStim);
case 'negative'
sendEvent(evNegativeStim);
case 'positive'
sendEvent(evPositiveStim);
end
% Repeatedly poll for input, clear screen after D_STIM_TIME
secs = GetSecs();
bInput = 0;
bCleared = false;
while(~bInput && secs < (lastStim + D_RESP_TIME))
if(~bCleared && secs > lastStim + D_STIM_TIME)
DrawFormattedText(windowPtr, [num2str(numBack) '-back: ' mode], ...
'center',0,D_TEXT_COLOR);
Screen('Flip',windowPtr);
bCleared = true;
end
[bInput, secs, keyCode] = KbCheck();
WaitSecs(.001);
end
% Interpret input
if(bInput)
cc = KbName(keyCode);
if(iscell(cc))
cc = cc{1};
end
switch cc
case 'esc'
disp('Exiting...');
break;
case 'f'
response = 'negative';
sendEvent(evRespNegative);
case 'j'
response = 'positive';
sendEvent(evRespPositive);
otherwise
fprintf('WARNING: Bad response ''%s''\n', cc);
response = 'none';
sendEvent(evRespInvalid);
end
else
response = 'none';
sendEvent(evRespTimeout);
end
% Determine if input was correct
if(isequal(trialType,response)) % Yes
feedback = 'correct';
elseif(isequal(trialType,'loading') && ... % Loading, no feedback and
isequal(response,'none')) % no response
feedback = 'none';
else
feedback = 'incorrect';
end
% Render feedback
DrawFormattedText(windowPtr, [num2str(numBack) '-back: ' mode], ...
'center',0,D_TEXT_COLOR);
switch feedback
case 'correct'
if(~practice)
if(~bFeedbackGFX)
DrawFormattedText(windowPtr,'CORRECT', ...
'center','center',[0, 255, 0]);
else
Screen('DrawTexture',windowPtr,tCorrect);
end
else
if(isequal(trialType,'positive'))
sFeedback = [ ...
'This screen was the same as the screen ' num2str(numBack) ...
' screen(s) back.'];
else
sFeedback = [ ...
'This screen was different than the screen ' num2str(numBack) ...
' screen(s) back.'];
end
if(~bFeedbackGFX)
DrawFormattedText(windowPtr,['CORRECT\n\n' ...
WrapString(sFeedback,50)],'center','center', ...
[0, 255, 0]);
else
Screen('DrawTexture',windowPtr,tCorrect);
DrawFormattedText(windowPtr,WrapString(sFeedback,50), ...
'center',my+150,[255, 255, 255]);
end
end
case 'incorrect'
if(~practice)
if(~bFeedbackGFX)
DrawFormattedText(windowPtr,'INCORRECT', ...
'center','center',[255, 0, 0]);
else
Screen('DrawTexture',windowPtr,tIncorrect);
end
else
if(isequal(trialType,'loading'))
sFeedback = [ ...
'There was nothing to compare this screen to, ' ...
'so you should not have pressed either key.'];
elseif(isequal(trialType,'negative'))
sFeedback = [ ...
'This screen did not match the screen ' num2str(numBack) ...
' screen(s) back, so you should have pressed "F"'];
else
sFeedback = [ ...
'This screen matched the screen ' num2str(numBack) ...
' screen(s) back, so you should have pressed "J"'];
end
if(~bFeedbackGFX)
DrawFormattedText(windowPtr,['INCORRECT\n\n' ...
WrapString(sFeedback,50)],'center','center', ...
[255, 0, 0]);
else
Screen('DrawTexture',windowPtr,tIncorrect);
DrawFormattedText(windowPtr,WrapString(sFeedback,50), ...
'center',my+150,[255,255,255]);
end
end
end
Screen('Flip',windowPtr);
% Record trial in data
data{trialNum+1,1} = subID;
data{trialNum+1,2} = mode;
data{trialNum+1,3} = trialNum;
data{trialNum+1,4} = stim;
data{trialNum+1,5} = trialHist{trialNum}(2);
data{trialNum+1,6} = location(1)/scrWidth;
data{trialNum+1,7} = location(2)/scrHeight;
data{trialNum+1,8} = trialType;
data{trialNum+1,9} = response;
data{trialNum+1,10} = feedback;
data{trialNum+1,11} = secs - lastStim;
end
evBlockEnd = evBlockEndBase + ...
evConditionTerm + numBack;
sendEvent(evBlockEnd);
close();
catch ME
close();
rethrow(ME);
end
function close()
ShowCursor;
ListenChar(0);
Screen('CloseAll');
if(D_DEV)
Screen('Preference','SkipSyncTests',0);
end
end
function showInstructions(windowPtr)
nStr = {'one','two','three','four','five','six','seven','eight','nine', ...
'ten'};
switch mode
case D_STIM_TYPE
sMode = ['You will be comparing the ' upper(D_STIM_TYPE) ...
' themselves in this part of the study. You should ' ...
'try your best to ignore the locations of the ' lower(D_STIM_TYPE) ...
'.'];
case 'Locations'
sMode = ['You will be comparing the LOCATIONS of the ' ...
lower(D_STIM_TYPE) ' in this part of the study. You ' ...
'should try your best to ignore the ' lower(D_STIM_TYPE) ...
' themselves.'];
case 'Both'
sMode = ['You will be comparing both the LOCATIONS and the ' ...
upper(D_STIM_TYPE) ' in this part of the study. Try to ' ...
'pay attention to both equally.'];
end
switch numBack
case 1
sNumBack = ['You will be performing the 1-BACK. Remember that ' ...
'this means you are comparing each screen to the previous ' ...
'screen, or "one back" from the current screen.'];
otherwise
sNumBack = ['You will be performing the ' num2str(numBack) '-BACK. Remember that ' ...
'this means you are comparing each screen to the screen ' ...
'"' nStr{numBack} ' back" from the current screen.'];
end
sKeys = ['Remember: Press the "F" key when the current screen does ' ...
'NOT match and press the "J" key when it does. Place your left ' ...
'and right index fingers on these keys now.'];
if(practice)
instructions = [WrapString(sMode,50) '\n\n' WrapString(sNumBack,50) '\n\n' ...
WrapString(sKeys,50) '\n\n Press any key to continue.'];
else
instructions = [WrapString(sMode,50) '\n\n' WrapString(sNumBack,50) '\n\n' ...
WrapString(sKeys,50) '\n\n Press any key to begin the experiment.'];
end
dispInfo(windowPtr,instructions,D_TEXT_COLOR,18);
if(practice)
pracExtra = ['Because this is practice, you will do fewer ' ...
'screens and you will have longer to answer for each screen. ' ...
'You will also be given a little more feedback after each screen.'];
dispInfo(windowPtr,[WrapString(pracExtra,50) ...
'\n\nPress any key to begin practice'],D_TEXT_COLOR,18);
end
Screen('Flip',windowPtr);
WaitSecs(1);
end
end