Principles of Gestalt Psychology BY K. KOFFKA PROFESSOR OF P‘YCIIOLOGY SMITH COLLLGE LOVDOV KEUAN PAUL. TRI‘N’FH. TRUB‘N‘FR 5: (30..LTD New York:I Hanourt, Brace and Company 1936 PRINTED IV T111: UNITED STATES 01 AM]RICA To KBHLER WOLFGANG AND MAX wan-mum INGRATITUDE INSPIRATEOI FOR THEIR FRIENDSHIP AND CONTENTS I. WHY PSYCHOLOGY? 3 u. BEHAVIOUR AND ITS FIELD: THE TASK 0F PSYCHOLOGY 24 ’III. THE ENVIRONMENTAL FIELD: THE PROBLEM. REFUTATION 0F FALSE SOLUTIONS. GENERAL FORMULATION OF THE 69 TRUE SOLUTION IV. THE ENVIRONMENTAL FIELD: VISUAL ORGANIZATION AND 106 ITS LAWS "V’. THE ENVIRONMENTAL FIELD: I-IGURE AND GROUND. THE FRAMEWORK I77 VI. THE ENVIRONMENTAL FIELD: THE CONSTANCIES 211 VII. THEENVIRONMENTAL IIELD: TRI-DIMENSIONAL SPACEAND 265 MOTION VIII. ACTION: REFLEXES; THEEGO; TI-IF EXECUTIVE IX. ACTION: ADJUSTEDBEHAVIOUR, A'I'I‘ITUDESI, EMOTIONS,AND 368 THI‘. WILL X. MEMORY: FOUNDATION OF A TRACE THEORY. THEORETICAL SECTION 423 XI. MEMORY: FOUNDATION OF A TRACE THEORY. EXPERI- MENTAL SECTION AND COMPLETION OF THE THEORY XII. LEARNING AND OTHER MEMORY FUNCTIONS—I 529 _ x111. LEARNING AND OTHER MEMORY FUNCTIONS-II 59I PERSOI‘fiLITY XIV. SOCIETY AND 648 XV. CONCLUSION 687 BIBLIOGRAPHY INDEX 703 PREFACE Thepurpose of thisbook hasbeen stated in the introductory and the final chapters. Therefore this preface can be brief. I conceived the plan of writing a book on gestalt psychology when after five years of pure research work I had to resume the work of teaching. Itseemedtome tobethebest way of systematizingmy own knowl- edge if I presented it in book form. The final result has not been quite the book I had in my mind when I began to write the first pages. I hoped that I could produce a work which would appeal to a wider circle of readers than that of the trained psychologists, and which would at the sametime contain enough concrete material to interest the more technical reader. To myself, and to some of my friends, I formulated this idea by saying that I planned a book which Would have a position intermediate between KOhler’s “Ge- stalt Psychology” and an ordinary text—book. I am afraid that all that has survived of this conception is that the book is neither the onenor the other. In my original plan I intended to give as systematic a presenta- tion of psychology asI wascapableof doing.And to this part of my programme I have clung with a determination which to some readers may at times appear pedantic.By this’I mean not complete- ness but consistency.I wanted to bring order into the great mass of facts discovered by modern psychology, by formulating clear-cut problems, showing their interrelationships, offering possible Solu— tions, and exposing the gaps which these solutions leave unfilled. If I wanted to present a system of psychology, it was not a dead or finished system,but a sy5tem in themaking, a system in the state of growth.From this point of view I divided the field and selected my material. My treatment, long as it has become, leaves out a great number of facts, many of them surely of great significance. But some selection there had to be, and although every selection is toSomeextent arbitraryanddependingupon theperson whoselects, I have tried to choose my material with regard to the contribution it could make tomy general plan. That I have drawn largely from gestalt literature isjustified by the title which indicates my concept found of systematization.1In rereading thebook I someparts much 1The greater part of this literature is in German and for this reason not easily accessible to English and American readers. In order to lift this barrierdo their becoming famlII-II’ with the original literature Dr. W. D. Ellis is preparing a book in which he hag assembled the condensed translations of some forty German books ix X PREFACE more difficult than others.Thisis especially true of the treatment of the perceptual constancies contained in the sixth chapter. These constancies contain some of the major problems of today’s experi- mental research and reveal in my opinion the power of the leading essential conceptsof this book. But their discussion is not absolutely to the development of thesystem asa whole.Thereader who is not sufficiently interested in them may therefore skip the sixth chapter without losing the thread of the general argument. After saying what I intended the book to be I may add a few words in explanation of what it is not meant tobe.In the first place it has no wish to be dogmatic.It lays before the reader a theory in agreat number of applications,but it is for the reader tojudge how effectivethis theory is. It would alsobe wrong to look at this book as the “authentic presentation of gestalt theory.” for there is no such thing. I have done nothing that any psychologist could not have done equally well or better. had he wished to do so.The gen- eral theoretical equipment and all the factswere available to every- body. There exists no “secret of the guild” which would giveme or other members of the so-called “gestalt school” a special standing. And therefore thebook has to be judged not only as a “gestalt psy- chology,”but also as a psychology. Furthermore, the book does not want to be polemical except in an entirely impersonal way which should appear throughout its pages and is explicitly mentioned in the concluding chapter. Nat- urally, in order to establish a certain explanation of phenomena other explanationshad tobe ruled out.In many places such explana- tions have been presented in a form made up by myself in sueh a way as to give them the greatest plausibility. At times, however, it was expedient to quote from individual authors.2 In these cases per- sonal polemics were as far from my mind as in the others. I have chosen my opponents because of the value of their contributions; it would have seemed unfair to me to disregard their arguments, and often enough the criticism of their Opinions has helped me in the development of my own hypotheses. In conclusionit ismeet to expressmy obligation to those without whose direct orindirect help this book could not have been written. Everybody knows, and my text reveals it in every chapter, what I owe to thetwo friends to whom I have dedicated it.Ever sincethe winter semester of 1910—11, when we three worked together at and articles on gestalt pswhology covering the period from 1915-1929:This col- lection, to be published In the near future, Will be of great help t.o the student of gestalt psychology. 2All references In the text refer to the bibliography appended at the end. PREFACE Xi Frankfort on theMain, I have been guided by their creative ideas. I was sorely tempted to add to my dedication the quotation from Faust which Hermann Ebbinghaus inscribed on the page on which he dedicated his Grundziige to Gustav Theodor Fechner, and only myreluctancetoplagiarizinghasprevented mefrom doingso.Iowe a great debt of gratitude to President W. A. Neilson and to Smith College,first for appointing me Research Professor and thus grant— ing me five full years in which supported by president and faculty I could devote all my effortsto pure research, and then making my load of teaching so easy that I could within little over two years write this book, thus utilizing the result of my five years' experi- menting and thinking. I thank my students who patiently listened to these chapters as they were composed, and contributed by a number of well chosen criticisms, and my colleagues with whom some of the problems were discussed in seminar talks. Another colleague of mine, though not a psychologist, Professor W. A. Orton, has read a good third of the book, suggesting several valu— able changes; he has also been of inestimable help in revising the final galleys. Dr.Julian Blackburn of the University of Cambridge, who spent six months with me as a Rockefeller Fellow, read the whole typescript and drew my attention to many places where the argument was not clear or lacked consistency. To my colleague at the Massachusetts State Collcge, Dr. W. D. Ellis, I am indebted for his painstaking work in revising the prtofs. But of all I have received the most active help from my former student, Dr. M. R. Harrower.Toher not onlythe author,but alsothereader, isgreatly indebted. In scanning every line of the typescript and the proofs with the greatest care she thought constantly both of the content and of the reader. In many hours of discussion she made me re- formulate a number of passages so that they carried meaning not only to myself but also to those who might take the trouble of studyingthe back. It isalso due to her skill that the English of the text is as correct as it is. I believethat psychology has entered aperiod of rapid and healthy progress so that this work will soon be antiquated in many parts. If it contributes even a small share'to such progress, I shall feel rewarded for the labour it cost me to write it. K. KOFFKA Smith College Northampton, Mass. February, 1935 CHAPTER I WHY PSYCHOLOGY? An Introductory Question.Facts and Theories. Seiencc andthe Sciences.Seicnccand Conduct.The Dangtr of SLICIICC. SLILnCt. as Discipline. Function of Science. Special Function of Psychology. Nature, Life, Mind. Integration of Quantity, Order, and Meaning. The Common Principle in the Preceding Discussion. Generality of the Gestalt Category.Why Psycholog)P AN INTRODUCTORY QUESTION When I first conceived the plan of writing this book I guessed, though I did not know, how much elIort it would cost to carry it out,and what demands it would put on a potential reader. And I doubted, not rhetorically but very honestly and Sincerely, whether such labour on the part of the author and the reader was justified. I was not somuch troubled by the idea of writing anotherbook on psychology in addition to the many books which have appeared during the last ten years, as by the idea of writing a book on psychology. Writing a book for publication is a social act. Is one justified in demanding co-operation of sociuy for such an enter- prise? What good cansociety,or a smallfractionof it,at best derive from it? I tried to give an answer to this question, and when now, afterhaving completed thebook,I return to this first chapter,I find that the answer which then gave me sufficient courage to start on my long journey, has stayed With me to the end. I believed I had found a reason why a book on psychology might do some good. Psychology has split up into so many branches and schools, either ignoringor fighting each other,that even an outsider may have the impression—surely strengthened by the publications “Psychologies of 1925” and “Psychologies of 1930”—thatthe plural “psychologies” shouldbe substituted for the Singularb Psychology has been pampered in the United States, where for many years it has enjoyed great popularity, though it seems to me that itsfortuneshave somewhat ebbcd and may be ebbingmore; in England, the land of conservative change, it found for a long time as cold a welcome as any other loud and startling innovation, but has gradually gained ground and is, in my belief, still gaining; in Germany, where experimental psychology was born and had at 3