The attraction effect: How our brains can be influenced

The attraction effect: How our brains can be influenced
An example set of possibilities: participants in the experiment saw three options with the respective amounts of money (green) and waiting times (red). The white frame indicates which option the person chose. Credit: University of Basel

The decisions we make are influenced by other possibilities that we did not choose. At the same time, the options we missed out on determine our satisfaction with the outcomes of situations we were unable to control. Psychologists from the University of Basel conducted two experiments: first, they studied the decision-making behavior of students and, second, they measured brain activity and satisfaction when a set of possibilities is supplemented with another alternative. The Journal of Neuroscience has published the results.

Classical economic models state that when faced with a decision, we always choose the option that is of greatest benefit to us, regardless of the benefits of other options. However, the latter assumption contradicts the much-researched «attraction effect". This leads us to make different decisions depending on how our situation appears at the time of the decision. If, when buying a camera, we are presented with a choice between an expensive, high-quality model and a cheap model of low quality, the addition of a third, unattractive camera - similar in quality to the expensive camera but with a higher price - leads us to choose the expensive model. Various studies show that people choose the option from the original selection that is clearly better than the third, additional option.

Same options - different decisions

Psychologists from the University of Basel have studied the attraction effect in connection with intertemporal choices for the first time. In our everyday lives, we are frequently confronted with decisions of this kind that require us to choose whether we prefer a small advantage as soon as possible or would rather wait longer for a greater advantage (an example is the conflict between the immediate enjoyment of a piece of cake and a long-term diet). In the study, a group of students solved numerous decision-making tasks on a computer. They were faced with a conflict between receipt of smaller amounts of money in a short time or larger sums at a later point in time. In order to create real decision-making situations, a selected sum of money was transferred to the students' bank accounts at the appropriate point in time. This experiment allowed the researchers to demonstrate the attraction effect: although the subjects were essentially making a choice between the same two alternatives, their decisions were influenced by the presence of a third, irrelevant option.

Measuring satisfaction and effect in the brain's reward system

A second group of students saw the same combinations of money and while an MRI scanner took a scan of their brain. The subjects were not able to make decisions actively; rather, an option was assigned to them at random. After the MRI scan, they reported their satisfaction with the outcome of the random selection. Here, too, the subjects were susceptible to the attraction effect, reporting different levels of with the outcome, depending on the options they were shown. In subjects who were particularly satisfied, and therefore subject to a strong attraction effect, the researchers observed through the scan an above-average effect in the brain's reward system.

Interdisciplinary research

The results of this research are based on a combination of different branches of science. «Our study spans the interface between neuroscience, psychology and economics", explains Prof. Sebastian Gluth, lead author of the study. «The results therefore invite further research, but they are also discussed, for example, in terms of their practical applications in marketing."


Explore further

Memories influence choice of food

More information: Sebastian Gluth et al, The Attraction Effect Modulates Reward Prediction Errors and Intertemporal Choices, The Journal of Neuroscience (2017). DOI: 10.1523/jneurosci.2532-16.2017
Journal information: Journal of Neuroscience

Citation: The attraction effect: How our brains can be influenced (2017, January 30) retrieved 12 November 2019 from https://medicalxpress.com/news/2017-01-effect-brains.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
27 shares

Feedback to editors

User comments