1. A general theory of learning and conditioning: Part I

   • Walter Pitts

   OriginalPaper Pages: 1 - 18

2. Factorial equations for tests of attention

   • John Richard Wittenborn

   OriginalPaper Pages: 19 - 35

3. An analysis of random and systematic changes with practice

   • Edward B. Greene

   OriginalPaper Pages: 37 - 52

4. On the interpretation of common factors: A criticism and a statement

   • H. A. Reyburn
   • J. G. Taylor

   OriginalPaper Pages: 53 - 64