1. Drive level and cue utilization in a free operant situation with albino rats

   • Jerome S. Cohen
   • B. Michael Quirt

   OriginalPaper Pages: 201 - 209

2. The influence of visual and auditory images on the recall of items of visual and auditory presentation mode

   • H.-G. Bosshardt

   OriginalPaper Pages: 211 - 227

3. Effects of stimulus congruence on hypotheses held in a concept identification task

   • John W. Cotton

   OriginalPaper Pages: 229 - 243

4. If: Some uses

   • Samuel Fillenbaum

   OriginalPaper Pages: 245 - 260

5. Determinants of the Zöllner illusion

   • Tadasu Oyama

   OriginalPaper Pages: 261 - 280