In psychology, the Zeigarnik effect states that people remember uncompleted or interrupted tasks better than completed tasks. In Gestalt psychology, the Zeigarnik effect has been used to demonstrate the general presence of Gestalt phenomena: not just appearing as perceptual effects, but also present in cognition.
Psychologist Bluma Zeigarnik first studied the phenomenon after her professor, Gestalt psychologist Kurt Lewin, noticed that a waiter had better recollections of still unpaid orders. However, after the completion of the task – after everyone had paid – he was unable to remember any more details of the orders. Zeigarnik, then, designed a series of experiments to uncover the dynamic facts underlying this phenomenon. Her research report was published in 1927.
The advantage of remembrance can be explained by looking at Lewin's field theory: a task that has already been started establishes a task-specific tension, which improves cognitive accessibility of the relevant contents. The tension is relieved upon completion of the task. If the task is interrupted, the reduction of tension is impeded. Through continuous tension, the content is made more easily accessible, and can be easily remembered.
The Zeigarnik effect suggests that students who suspend their study, during which they do unrelated activities (such as studying unrelated subjects or playing games), will remember material better than students who complete study sessions without a break (McKinney 1935; Zeigarnik, 1927).
The Zeigarnik effect should not be confused with the Ovsiankina effect. Maria Ovsiankina was a colleague of Bluma Zeigarnik who investigated the effect of task interruption on the tendency to resume the task at the next opportunity.
The Zeigarnik effect has been used to explain the widespread criticism of the National Basketball Association in allowing free throws for a player "chucking it up whenever a guy comes near them." There is a stoppage of play with each foul. When repeatedly done, it is felt to build up a cognitive bias against this move. The criticism necessitated a rule change penalizing this activity, known as the Harden Rule, named after its most prominent user, James Harden.
The reliability of the effect has been a matter of some controversy. Several studies attempting to replicate Zeigarnik's experiment, done later in other countries, failed to find significant differences in recall between finished and unfinished (interrupted) tasks (e.g. Van Bergen, 1968).
- cf. Kurt Koffka, Principles of Gestalt Psychology, 1935, pp 334ff.
- Zeigarnik 1927: Das Behalten erledigter und unerledigter Handlungen. Psychologische Forschung 9, 1-85.
- Kurt Lewin, A Dynamic Theory of Personality, 1935, pp 243ff
- Ovsiankina 1928: Die Wiederaufnahme unterbrochener Handlungen. In: Psychologische Forschung 11(3/4), 302–379.
- Boone, Kyle (September 22, 2017). "The NBA is finally cracking down on James Harden's foul-drawing antics". CBSSports.com. Retrieved October 4, 2017.
- "NBA implementing 'Zaza Pachulia,' 'James Harden' rules". NBCSports.com. September 21, 2017. Retrieved October 4, 2017.
- https://www.cbssports.com/nba/news/how-the-nbas-newly-imposed-harden-rule-will-impact-james-harden-this-season/Haren rule impact
- Einstein, Gilles O.; McDaniel, Mark A.; Williford, Carrie L.; Pagan, Jason L.; Dismukes, R. Key (2003). "Forgetting of intentions in demanding situations is rapid" (PDF). Journal of Experimental Psychology: Applied. 9 (3): 147–162. doi:10.1037/1076-898X.9.3.147.
[...] there is controversy regarding the reliability of the Zeigarnik effect [...]
- Zeigarnik, B. (1927). Das Behalten erledigter und unerledigter Handlungen. Psychologische Forschung, 9, 1-85.
- A condensed and abridged English version: Zeigarnik, B. (1938), "On Finished and Unfinished Tasks", pp.300-314 in W. D. Ellis (Ed.), A Sourcebook of Gestalt Psychology, London: Kegan Paul, Trench, Trubner & Co.
- Burke W.W., "A Perspective on the Field of Organization Development and Change: The Zeigarnik Effect", The Journal of Applied Behavioral Science, Vol.47, No.2, (June 2011), pp.143-167.
- Denmark, Florence L. (2010). "Zeigarnik Effect". In Weiner, Irving B.; Craighead, W. Edward. The Corsini Encyclopedia of Psychology (4th ed.). John Wiley & Sons. pp. 1873–1874. doi:10.1002/9780470479216.corpsy0924. ISBN 9780470170236.
- Mazur, Elena, "The Zeigarnik Effect and the Concept of Unfinished Business in Gestalt Therapy", British Gestalt Journal, Vol.5, No.1, (1996), pp.18-23.
- McKinney, Fred, "Studies in the Retention of Interrupted Learning Activities", Journal of Comparative Psychology, Vol.19, No.2, (April 1935), 265-296.
- Oyama, Yoshinori, Manalo, Emmanuel & Nakatan, Yoshihide (2018), "The Hemingway eﬀect: How failing to ﬁnish a task can have a positive eﬀect on motivation", Thinking Skills and Creativity. doi=10.1016/j.tsc.2018.01.001
- Savitsky, K., Medvec, V.H. & Gilovich, T., "Remembering and Regretting: The Zeigarnik Effect and the Cognitive Availability of Regrettable Actions and Inactions", Personality and Social Psychology Bulletin, Vol.23, No.3, (March 1997), pp.248-257. doi=10.1177/0146167297233004
- Syrek, C.J., Weigelt, O., Peifer, C. & Antoni, C.H., "Zeigarnik’s sleepless nights: How unfinished tasks at the end of the week impair employee sleep on the weekend through rumination", Journal of Occupational Health Psychology, Vol.22, No.2, (April 2017), pp.225-238.
- Van Bergen, Annie, Task Interruption, North-Holland, (Amsterdam), 1968.
- Weiner, B., Johnson, P.B. & Mehrabian, A., "Achievement Motivation and the Recall of Incomplete and Completed Exam Questions", Journal of Educational Psychology, Vol.59, No.3, (June 1968), pp.181-185.