Project Gutenberg's The Mental Life of Monkeys and Apes, by Robert M. Yerkes

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

Author: Robert M. Yerkes

Release Date: January 27, 2004 [EBook #10843]

Language: English

Character set encoding: ASCII

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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

WITH SIX PLATES AND FIVE TEXT FIGURES

CONTENTS

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

VI. Historical and critical discussion of ideational behavior in
monkeys and apes:

1. Evidences of ideation in monkeys
2. Evidences of ideation in apes

VII. Provision for the study of the primates and especially the monkeys
and anthropoid apes

VIII. Bibliography

I

INTERESTS, OPPORTUNITY AND MATERIALS

Two strong interests come to expression in this report: the one in the
study of the adaptive or ideational behavior of the monkeys and the