123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248 |
- function Chromatic_Integration_Stimulus(varargin)
- %===================================================================================
- % Parameter Default Usage
- %===================================================================================
- % selecttextfile false Browse prompt to select the parameters text file
- % stimduration 30 Stimulus presentation duration screen refresh rate unit (30 = 0.5 sec)
- % preframes 120 Duration of background light presented in between the stimulus flashes
- % maxcontrast 0.2 Maximum Weber contrast value (ranges from -1 to 1)
- % mincontrast -0.2 Minimum Weber contrast value (ranges from -1 to 1)
- % contrastdiff 0.02 Contrast steps from mincontrast to maxcontrast e.g. -20 : 2 : 20
- % seed -1000 Starting value for random number generator (should be always negative)
- % redmeanintensity 0 Mean intensity for red gun of the screen
- % greenmeanintensity 0.5 Mean intensity for green gun of the screen
- % bluemeanintensity 0.5 Mean intensity for blue gun of the screen
- % screensize 864 x 480 Screen resolution, default value is the resolution of the lightcrafter projector
- % refreshrate 60 Screen refresh rate in Hz
- % fullscreen false Option to display the stimulus in full-screen mode
- % help false Option to check the list of available parameters
- % lmargin 0 Margins from left side of the screen (not available for this stimulus)
- % rmagin 0 Margins from right side of the screen (not available for this stimulus)
- % tmargin 0 Margins from top of the screen (not available for this stimulus)
- % bmargin 0 Margins from bottom of the screen (not available for this stimulus)
- % coneisolating false Option to activate opsin-isolation (excluded for simplicity)
- %
- %===================================================================================
- para = read_stimulus_parameters(varargin{:});
- if para.help, return; end
- offcontrasts = fliplr(0:-para.contrastdiff:para.mincontrast);
- oncontrasts = 0:para.contrastdiff:para.maxcontrast;
- greencontrasts = [offcontrasts,oncontrasts];
- bluecontrasts = [oncontrasts,offcontrasts];
- % convert to weber contrast (mean+(contrast*mean))
- greencontrasts = para.greenmeanintensity + (greencontrasts * para.greenmeanintensity);
- bluecontrasts = para.bluemeanintensity + (bluecontrasts * para.bluemeanintensity);
- numcontrasts = size(greencontrasts,2);
- % The darwing of the screen goes here
- monitorsize = get(0,'ScreenSize');
- scpos = [monitorsize(3)/2-(para.screensize(1)/2), ...
- monitorsize(4)/2-(para.screensize(2)/2), para.screensize];
- % make an screen like figure
- fh = figure('Menu','none','ToolBar','none','Position',scpos,'Color',0.5*[1 1 1]);
- fh.Name = 'Example of Chromatic Integration Stimulus, from Khani and Gollisch (2021)';
- fh.Colormap = gray;
- ah = axes('Units','Normalize','Position',[0 0 1 1]);
- axis(ah,[0, para.screensize(1),0, para.screensize(2)]);
- axis(ah,'off');
- stimsize = [0+para.bmargin, 0+para.lmargin, para.screensize(1)-para.rmargin,...
- para.screensize(2)-para.tmargin];
- framecounter= 0;
- seed = para.seed;
- while ishandle(fh)
-
- if framecounter == 0
- % start with gray screen
- r= rectangle('pos',stimsize,'facecolor',[0.5 0.5 0.5],'edgecolor','none');
- end
-
- frameMod = mod(framecounter,para.stimduration + para.preframes);
- colorindexMod = floor(mod((framecounter)/(para.stimduration+para.preframes),numcontrasts));
-
- % resest the color order using Fisher-Yates random permutations
- if colorindexMod == 0 && frameMod == 0
- [colorder, seed] = fisher_Yates_shuffle_order(seed,1:numcontrasts);
- end
-
- % show gray screen in between stimulus frames
- if frameMod < (para.preframes)
- r.FaceColor = [0.5 0.5 0.5]; % gray screen during preframes
- else
- r.FaceColor = [0, greencontrasts(colorder(colorindexMod+1)), bluecontrasts(colorder(colorindexMod+1))];
- end
-
- % this is to draw the frames relatively accurately.
- drawnow;
- java.lang.Thread.sleep(1/para.refreshrate*1e3);
- %pause(1/para.refreshrate);
- framecounter = framecounter+1;
- end
- end
- %--------------------------------------------------------------------------------------------------%
- %---------- sub-functions ----------%
- %--------------------------------------------------------------------------------------------------%
- function varargout = fisher_Yates_shuffle_order(seed,inputVec,varargin)
- %
- %%% fisher_Yates_shuffle_order %%%
- %
- %
- % This function generate psudorandom permution similar to randperm in MATLAB
- % but works with psudorandom number generator ran1. It also gives back the
- % most recent seed value to continue the permuation in case of repeated trials.
- % note that the direction of permutation is along x-axix or for columns of
- % MATALB not for the rows.
- %
- %
- % ===============================Inputs====================================
- %
- % seed : seed value for random number generation.
- % inputVec : input vector used for permutation.
- %
- %================================Output====================================
- %
- % testOrder : vector of permuted indices for the inputVec.
- % newSeed : the recent seed that used in the ran1 function.
- % outputVec : the permuted input vector along x-axis
- %
- % Note that the permution algorithem is based on Fisher-Yates shuffle
- % algorithem identical to what is used in the stimulus program.
- % for more info check :
- % https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle
- %
- % written by Mohammad, 01.02.2016
- newSeed = seed;
- testOrder = zeros(1,size(inputVec,2));
- testOrder(1) = 1;
- for i = 2:length(inputVec)-1
-
- [randVal,newSeed] = ran1(newSeed);
-
- j = ceil(i*randVal); % based on Fischer-Yates algorithem
- testOrder(i) = testOrder(j);
- testOrder(j) = i;
-
- end
- testOrder = [testOrder(end),testOrder(1:end-1)]+1; % to match MATLAB indexing
- varargout{1} = testOrder;
- varargout{2} = newSeed;
- for j = 1:size(inputVec,1)
- varargout{3}(j,:) = inputVec(j,testOrder);
- end
- end
- %--------------------------------------------------------------------------------------------------%
- function paraout = read_stimulus_parameters(varargin)
- % first parse the user inputs
- p = inputParser(); % check the user options.
- p.addParameter('selecttextfile', false, @(x) islogical(x) || (isnumeric(x) && ismember(x,[0,1])));
- p.addParameter('stimduration', 30, @isnumeric);
- p.addParameter('preframes', 120, @isnumeric);
- p.addParameter('contrastdiff', 0.02, @isnumeric);
- p.addParameter('mincontrast',-0.2, @isnumeric);
- p.addParameter('maxcontrast', 0.2, @isnumeric);
- p.addParameter('seed', -1000, @isnumeric);
- p.addParameter('redmeanintensity', 0, @isnumeric);
- p.addParameter('greenmeanintensity', 0.5, @isnumeric);
- p.addParameter('bluemeanintensity', 0.5, @isnumeric);
- p.addParameter('lmargin',0, @isnumeric);
- p.addParameter('rmargin', 0, @isnumeric);
- p.addParameter('bmargin', 0, @isnumeric);
- p.addParameter('tmargin', 0, @isnumeric);
- p.addParameter('coneisolating', true, @(x) islogical(x) || (isnumeric(x) && ismember(x,[0,1])));
- p.addParameter('screensize', [864 480], @isnumeric);
- p.addParameter('refreshrate', 60, @isnumeric);
- p.addParameter('fullscreen', false, @(x) islogical(x) || (isnumeric(x) && ismember(x,[0,1])));
- p.addParameter('help', false, @(x) islogical(x) || (isnumeric(x) && ismember(x,[0,1])));
- p.parse(varargin{:});
- % defualt parameters
- defpara = p.Results;
- if defpara.help
- help_info_for_parameters(defpara);
- paraout = defpara;
- return;
- end
- if defpara.selecttextfile
- % now read the text files
- [stimfile, stimpath] = uigetfile('*.txt','Select a chromatic integration stimulus parameter file','chromatic_integration.txt');
-
- fid = fopen([stimpath,filesep,stimfile]);
- tline = fgetl(fid);
- while ischar(tline)
- tline = fgetl(fid);
- if tline == -1, break; end
- fn = extractBefore(tline,' = ');
- if isempty(fn), continue; end
- val = extractAfter(tline,' = ');
- % to convert to double
- if ~isnan(str2double(val))
- val = str2double(val);
- end
- % to convert to logical
- if strcmp(val,'true'), val = true; end
- if strcmp(val,'false'), val = false; end
- % store the values in a structure
- stimpara.(fn) = val;
- end
- fclose(fid);
-
- % compare the text file to the defualt values and fill the missing parameters
- fn = fieldnames(defpara);
- for ii = 1:numel(fn)
- if isfield(stimpara,fn{ii})
- paraout.(fn{ii}) = stimpara.(fn{ii});
- else
- paraout.(fn{ii}) = defpara.(fn{ii});
- end
- end
- else
- paraout = defpara;
- end
- if paraout.fullscreen
- monitorsize = get(0,'ScreenSize');
- paraout.screensize = monitorsize(3:4) ;
- end
- end
- %--------------------------------------------------------------------------------------------------%
- function help_info_for_parameters(defpara)
- fn = fieldnames(defpara);
- fprintf(['\n\n',repmat('==',1,50),'\r\n']);
- fprintf([repmat(' ',1,35),'List of Stimulus Parameters\r\n']);
- fprintf([repmat('==',1,50),'\r\n']);
- maxtxtlen = max(cellfun(@numel,fn))+10;
- for ii = 1:numel(fn)
- g = repmat(' ',1,maxtxtlen - numel(fn{ii}));
- fprintf(['\t-- \t%s',g,':',repmat(' ',1,10),'%s\n'],fn{ii},num2str(defpara.(fn{ii})));
- end
- fprintf(['\n',repmat('==',1,50),'\r\n']);
- end
|