diff --git a/ICAFIX/scripts/functionhighpassandvariancenormalize.m b/ICAFIX/scripts/functionhighpassandvariancenormalize.m
index 675a8b48c..c8a64dd50 100644
--- a/ICAFIX/scripts/functionhighpassandvariancenormalize.m
+++ b/ICAFIX/scripts/functionhighpassandvariancenormalize.m
@@ -119,6 +119,7 @@ function functionhighpassandvariancenormalize(TR,hp,fmri,WBC,varargin)
         ctsX=size(ctsfull,1); ctsY=size(ctsfull,2); ctsZ=size(ctsfull,3); ctsT=size(ctsfull,4); 
         ctsfull=reshape(ctsfull,ctsX*ctsY*ctsZ,ctsT);
         ctsmask=range(ctsfull, 2) > 0;
+        fprintf('Non-empty voxels: %d (= %.2f%% of %d)\n', sum(ctsmask), 100*sum(ctsmask)/size(ctsfull,1), size(ctsfull,1));
         cts=ctsfull(ctsmask,:); 
         clear ctsfull;
 
@@ -152,6 +153,7 @@ function functionhighpassandvariancenormalize(TR,hp,fmri,WBC,varargin)
         ctsX=size(ctsfull,1); ctsY=size(ctsfull,2); ctsZ=size(ctsfull,3); ctsT=size(ctsfull,4);
         ctsfull=reshape(ctsfull,ctsX*ctsY*ctsZ,ctsT);
         ctsmask=range(ctsfull, 2) > 0;
+        fprintf('Non-empty voxels: %d (= %.2f%% of %d)\n', sum(ctsmask), 100*sum(ctsmask)/size(ctsfull,1), size(ctsfull,1));
         cts=ctsfull(ctsmask,:); 
         clear ctsfull;
     end
@@ -171,6 +173,7 @@ function functionhighpassandvariancenormalize(TR,hp,fmri,WBC,varargin)
         ctsX=size(ctsfull,1); ctsY=size(ctsfull,2); ctsZ=size(ctsfull,3); ctsT=size(ctsfull,4);
         ctsfull=reshape(ctsfull,ctsX*ctsY*ctsZ,ctsT);
         ctsmask=range(ctsfull, 2) > 0;
+        fprintf('Non-empty voxels: %d (= %.2f%% of %d)\n', sum(ctsmask), 100*sum(ctsmask)/size(ctsfull,1), size(ctsfull,1));
         cts=ctsfull(ctsmask,:);
         clear ctsfull;
         
diff --git a/ICAFIX/scripts/icaDim.m b/ICAFIX/scripts/icaDim.m
index 35dbfc99d..260146d36 100644
--- a/ICAFIX/scripts/icaDim.m
+++ b/ICAFIX/scripts/icaDim.m
@@ -30,8 +30,10 @@
 
 % Apply mask, if it is helpful
 if useMask
+    fprintf('icaDim: Non-empty voxels: %d (= %.2f%% of %d). Masking for memory efficiency.\n', sum(mask), 100*sum(mask)/NvoxOrig, NvoxOrig);
     data = Origdata(mask,:);
 else
+    fprintf('icaDim: No empty voxels -- not masking\n');
     data = Origdata;  % "copying" the input as-is doesn't use any memory
     clear mask;
 end