The Mental Life of Monkeys and Apes: A Study of Ideational Behavior

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The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
ROBERT M. YERKES Harvard University
BEHAVIOR MONOGRAPHS Volume 3, Number 1, 1916 Serial Number 12 Edited by JOHN B. WATSON The Johns Hopkins University
I. Interests, opportunity and materials
II. Observational problems and methods
III. Results of multiple-choice experiments:
1. Skirrl, Pithecus irus 2. Sobke, Pithecus rhesus 3. Julius, Pongo pygmaeus
IV. Results of supplementary tests of ideational behavior:
1. Julius, Pongo pygmaeus : Box stacking experiment Box and pole experiment Draw-in experiment Lock and key test 2. Skirrl, Pithecus irus : Box stacking experiment Box and pole experiment Draw-in experiment Hammer and nail test Other activities 3. Sobke, Pithecus rhesus : Box stacking experiment Draw-in experiment Box and pole experiment Other activities
V. Miscellaneous observations:
1. Right- and left-handedness 2. Instinct and emotion: Maternal instinct Fear Sympathy