[Gzz-commits] manuscripts/Paper exper.txt

[Janne V. Kujala]

CVSROOT:        /cvsroot/gzz
Module name:    manuscripts
Changes by:     Janne V. Kujala <address@hidden>        03/02/28 07:31:40

Modified files:
        Paper          : exper.txt 

Log message:
        more exper

CVSWeb URLs:
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/manuscripts/Paper/exper.txt.diff?tr1=1.4&tr2=1.5&r1=text&r2=text

Patches:
Index: manuscripts/Paper/exper.txt
diff -u manuscripts/Paper/exper.txt:1.4 manuscripts/Paper/exper.txt:1.5
--- manuscripts/Paper/exper.txt:1.4     Wed Feb 26 10:06:43 2003
+++ manuscripts/Paper/exper.txt Fri Feb 28 07:31:38 2003
@@ -11,20 +11,21 @@
 - means: show that text size has much stronger effect on reading speed
   than the presence of a background texture
 
-    - 2 test cases: white background and texture background
-    - each subject reads 24 texts (length approx. 15 s) on the 
-      two types of backgrounds and the time is measured
-    - 12 different font sizes are used, ranging from about 4mm to 2cm;
+    - 3 test cases: white background, light texture, and dark texture
+    - each subject reads 12 texts (length approx. 15 s) on the 
+      three types of backgrounds and the time is measured
+    - 6 different font sizes are used, ranging from about 4mm to 2cm;
       for each font size, there are two texts
-    - the subjects are in two groups and, for each text, 
-      the order of the two test cases is reversed between the groups
-
+    - for each text, each of the 6 possible permutations of 
+      the bg types is used for one subject
+      
 - desired results
  
     - draw a graph of reading speed as a function of font size for 
       both cases
-    - the transition from readable to unreadable should occur only slightly 
-      sooner for the texture background when the font size decreases;
+    - we hope that the transition from readable to unreadable 
+      occurs only slightly sooner for the texture backgrounds when 
+      the font size decreases;
       for sizes over the threshold, the reading speed should be 
       approximately the same for both cases
       
@@ -36,34 +37,44 @@
           - trust the subject to read carefully?
           - read aloud?
           - ask questions afterwards?
-     - would it be better to use different texts for the two test cases?
+     - would it be better to use different texts for three bg types?
        (i.e., is the memory effect stronger than the variation between 
        the texts)
      - is the total of 2 * 6 subjects = 12 trials for each 
-       (font size, test case) pair enough to compensate the 
+       (font size, bg type) pair enough to compensate the 
        memory effect and to obtain small enough variance?
-
-     - how to scale the font? 
-       should the background be scaled with it?
-     - what textures to use?
-       If we use unique textures for each text, they add extra
-       variation to the reading speed.
+     - how to scale the font? should the background be scaled with it?
+     - should the bg textures be assigned in random order to the texts
+       for each subject?
+     - should the font sizes be assigned in random order to the textx
+       for each subject?
 
 Recognizability test
 --------------------
-- objective: show that textures can be remembered and that
-  they are better than single colors
+- objectives: 
+     - show that textures can be remembered
+     - show that textures can be remembered better than single colors
+     - compare the recognizablity of light and dark textures
 
+- procedure
     - test cases: single color / full textures [ / grayscale textyres ]
 
-    - learning phase: show 30 textures in series, 5 seconds each
+    - learning phase: show 15 textures in series, 5 seconds each
 
     - recognition phase: 
-      trials: 30 new textures mixed in and shuffled with the 30 old;
+      trials: 15 new textures mixed in and shuffled with the 15 old;
       for each trial, the subject answers old/new
 
-ISSUES:
-    - probably need some repetition to be able to memorize!
+    - three different tests are done for each subject with
+      single color / light texture / dark texture background
+
+    - In what order should we do the three subtests?
+      There should ne no memory effect (obviously we need to
+      use different light and dark textures).
+      However, the subject could learn during the tests.
+      Perhaps use all the 6 different orders for the 6 subjects.
+
+