1. Motivational effects of drugs: Methods which illustrate some general problems in psychopharmacology

   • Neal E. Miller
   • Herbert Barry III

   Reviews Pages: 169 - 199

2. Quantification of the EEG-activation response: Effects of atropine

   • J. -L. Riehl
   • J. C. Paul
   • K. R. Unna

   Original Investigations Pages: 200 - 209

3. Effects of aggregation and temperature on amphetamine toxicity in mice

   • Rudolf Höhn
   • Louis Lasagna

   Original Investigations Pages: 210 - 220

4. Impairment by lysergic acid diethylamide of accuracy in performance of a delayed alternation test in monkeys

   • Murray E. Jarvik
   • Stephan Chorover

   Original Investigations Pages: 221 - 230

5. The effect of several psychotomimetic drugs on human serum cholinesterase

   • Franklin T. Evans

   Original Investigations Pages: 231 - 240

6. Prolonged reactions to mescaline

   • Ian Stevenson
   • Thomas W. Richards

   Clinical Reports Pages: 241 - 250

7. Brain stimulation reward „Thresholds” self-determined in rat

   • Larry Stein
   • Oakley S. Ray

   Short Communications Pages: 251 - 256

8. Studies on cross tolerance with LSD-25, UML-491 and JB-336

   • Antonio Balestrieri

   Letters to the Editor Pages: 257 - 259

9. Psychopharmacology—Problems in evaluation

   • Michael Shepherd

   Bibliographies of Current Literature Pages: 259 - 260