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85 lines
2.4 KiB
Matlab
85 lines
2.4 KiB
Matlab
function V1_size_tuning_contrast
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crop=0;
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grating_wavel=6;
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diams=[3:4:31];
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contrasts=[0.06,0.13,0.25,0.5,1];
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iterations=8;
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phase=0;
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node=1;
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[wFFon,wFFoff]=dim_conv_V1_filter_definitions;
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clf
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j=0;
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for cont=contrasts
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j=j+1;
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fprintf(1,'.%i.',j);
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i=0;
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for diam=diams
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i=i+1;
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%a grating:
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I=image_contextual_surround(diam,max(diams)-diam/2,0,grating_wavel,grating_wavel,0,phase,0,cont,0);
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[Ion,Ioff]=preprocess_image(I);
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[a,b]=size(I);
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%plot original image
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maxsubplot(3,length(diams),i),
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imagesc(I(crop+1:a-crop,crop+1:b-crop,:),[0,1]);
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axis('equal','tight'), set(gca,'XTick',[],'YTick',[],'FontSize',11);
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drawnow;
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%initial response without competition
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[y,ron,roff,eon,eoff,Y]=dim_conv_on_and_off(wFFon,wFFoff,Ion,Ioff,1);
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y=mean(Y,4);
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maxsubplot(3,length(diams),i+length(diams)),
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imagesc(y(crop+1:a-crop,crop+1:b-crop,node),[0,0.05]),
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axis('equal','tight'), set(gca,'XTick',[],'YTick',[],'FontSize',11);
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drawnow;
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%perform competition
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[y,ron,roff,eon,eoff,Y]=dim_conv_on_and_off(wFFon,wFFoff,Ion,Ioff,iterations);
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y=mean(Y,4);
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maxsubplot(3,length(diams),i+2*length(diams)),
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imagesc(y(crop+1:a-crop,crop+1:b-crop,node),[0,0.01]),
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axis('equal','tight'), set(gca,'XTick',[],'YTick',[],'FontSize',11);
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drawnow;
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sc(j,i)=y(ceil(a/2),ceil(b/2),node);
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end
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end
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figure(1),clf
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subplot(3,2,[4,6])
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plot(diams,sc(1,:),'r-o','LineWidth',1,'MarkerSize',6,'MarkerFaceColor','r');
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hold on
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plot(diams,sc(2,:),'r-o','LineWidth',2,'MarkerSize',6,'MarkerFaceColor','r');
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plot(diams,sc(3,:),'r-o','LineWidth',3,'MarkerSize',6,'MarkerFaceColor','r');
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plot(diams,sc(4,:),'r-o','LineWidth',4,'MarkerSize',6,'MarkerFaceColor','r');
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plot(diams,sc(5,:),'r-o','LineWidth',5,'MarkerSize',6,'MarkerFaceColor','r');
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axis([1,33,0,0.015])
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set(gca,'XTick',[5:5:30],'YTick',[0:0.005:0.015],'FontSize',20,'Box','off');
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xlabel('Diameter (pixels)'),ylabel('Response')
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figure(2),clf
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maxsubplot(5,2,8)
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maxdiam=max(diams).*2;
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spacingh=(175-maxdiam)/2;
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L=zeros(maxdiam,2*spacingh+maxdiam)+0.5;
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centv=ceil(maxdiam/2)+1;
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centh=ceil(maxdiam/2)+2;
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for diam=diams([1,5,7])
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I=image_contextual_surround(diam,max(diams)-diam/2,0,grating_wavel,grating_wavel,0,0,0,1,0);%a grating
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[a,b]=size(I);
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L(centv-floor(a/2):centv+floor(a/2),centh-floor(a/2):centh+floor(a/2))=I;
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centh=centh+spacingh;
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end
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imagesc(L);
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axis('equal','off')
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ends=33-maxdiam/2;
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axis([-ends,2*spacingh+maxdiam+ends,maxdiam.*0.25,maxdiam.*0.75])
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cmap=colormap('gray');
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%cmap=1-cmap;
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%colormap(cmap);
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