1. The effect of LSD-25 on the interaction between conditioned and non-conditioned stimuli in a simple avoidance situation

   • B. J. Key

   Original Investigations Pages: 319 - 326

2. Alterations in the generalisation of visual stimuli induced by lysergic acid diethylamide in cats

   • B. J. Key

   Original Investigations Pages: 327 - 337

3. Some effects of drugs on rats in varying conditions of sensory stimulation

   • Alan R. King

   Original Investigations Pages: 338 - 346

4. Effects of morphine on the operant behaviour in rats

   • L. Molinengo

   Original Investigations Pages: 347 - 367

5. Electroencephalographic studies on the action of monoamine oxidase inhibitor

   • Akira Shimizu
   • Yasuo Hishikawa
   • Ziro Kaneko

   Original Investigations Pages: 368 - 387

6. Effects of sodium pentobarbital on complex operant discriminations

   • Robert Berryman
   • William W. Cumming
   • Murray E. Jarvik

   Original Investigations Pages: 388 - 398