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Abstract

Contrary to conventional wisdom, it is not always advantageous to engage in thorough conscious deliberation before choosing. On the basis of recent insights into the characteristics of conscious and unconscious thought, we tested the hypothesis that simple choices (such as between different towels or different sets of oven mitts) indeed produce better results after conscious thought, but that choices in complex matters (such as between different houses or different cars) should be left to unconscious thought. Named the “deliberation-without-attention” hypothesis, it was confirmed in four studies on consumer choice, both in the laboratory as well as among actual shoppers, that purchases of complex products were viewed more favorably when decisions had been made in the absence of attentive deliberation.

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References and Notes

1
It is important to note that attention to the problem at hand is the crucial distinction in our definitions of conscious and unconscious thought. Thinking about buying a new car while attention is directed at possible new cars is conscious thought. Thinking about buying a new car while attention is temporarily directed elsewhere is unconscious thought. This distinction does not mean that conscious thought only comprises conscious processes. One can compare it to speech. Speech is a conscious process (i.e., attention is directed at it while one speaks), but it is in part dependent on accompanying unconscious processes (such as processes responsible for syntax or word choice).
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As far as we know, the possibility of unconscious thought (as well as the term “unconscious thought”) was explicitly used for the first time by Schopenhauer, who remarked that “One might almost believe that half of our thinking takes place unconsciously” (27).
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The idea of unconscious thought was also studied by various researchers interested in incubation processes in creativity. An example is K. S. Bowers et al. (28).
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Quality of decision was operationalized from a normative perspective. One of the choice options was made more desirable than the others because it had been assigned more positive aspects than the other apartments.
21
A. Dijksterhuis, L. F. Nordgren, Persp. Psychol. Sci., in press.
22
The important distinction between following rules and merely conforming to them (and the need for conscious attention in the former) was made by S. A. Sloman (29).
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E. R. Smith, J. DeCoster, Dual-Process Theories in Social Psychology, S. Chaiken, Y. Trope, Eds. (Guilford, New York, 1999), pp. 323–336.
24
Unconscious thought is reminiscent of implicit learning, but there is an important difference. Implicit learning refers to aspects of a task that are learned while working on the task (and that are inaccessible to consciousness). Unconscious thought refers to thought processes that take place after the encoding of relevant information. A good example of this definition of unconscious thought is the groundbreaking work by Stickgold and colleagues on learning during sleep. See, e.g., (30, 31).
25
Materials and methods are available as supporting material on Science Online.
26
We found a correlation between number of aspects and amount of thought (r = 0.54, P < 0.001): The more complex a product is, the more people think consciously when deciding to purchase it. Understandable as this may be, our analysis suggests that people should do the opposite, i.e., think unconsciously when deciding to purchase a complex product. The correlation between number of aspects and price was also significant (r = 0.45, P < 0.001): Expensive products were more complex than inexpensive ones.
27
A. Schopenhauer, in Essays and Aphorisms (Penguin, London, 1851/1970), p. 123.
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32
We thank E. Neimeijer, L. Schreers, and R. Wassenberg for help with conducting study 4. This research was supported by a grant from Nederlandse Organisatie voor Wetenschappelijk Onderzoek (016.025.030).

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Published In

Science
Volume 311 | Issue 5763
17 February 2006

Submission history

Received: 20 October 2005
Accepted: 9 January 2006
Published in print: 17 February 2006

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Notes

Supporting Online Material
www.sciencemag.org/cgi/content/full/311/5763/1005/DC1
Materials and Methods

Authors

Affiliations

Ap Dijksterhuis* [email protected]
Department of Psychology, University of Amsterdam, Roetersstraat 15, 1018 WB, Amsterdam, the Netherlands.
Maarten W. Bos
Department of Psychology, University of Amsterdam, Roetersstraat 15, 1018 WB, Amsterdam, the Netherlands.
Loran F. Nordgren
Department of Psychology, University of Amsterdam, Roetersstraat 15, 1018 WB, Amsterdam, the Netherlands.
Rick B. van Baaren
Department of Psychology, University of Amsterdam, Roetersstraat 15, 1018 WB, Amsterdam, the Netherlands.

Notes

*
To whom correspondence should be addressed. E-mail: [email protected]

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