A post by Alma Barner
We sometimes rely on imagination when making decisions about what to do. I wonder what I should do, later this afternoon. I imagine going swimming in the nearby pool. Or, if it doesn’t rain, I could go to the park to play badminton.
In decision-making, imagination can help us bring salient alternatives to act to mind. It can help us decide which options are realistic, which actions feasible. Imagining what I could do can help me get clear on what my preferences are; it might even bring to the surface preferences I had forgotten I have. It is well-established that imagination plays an important role in future-oriented planning.
It is also well-established that purely self-interested decision-making is not our only or even typical way of going about. Humans are social. We don’t usually spend our weekends all by ourselves, but with families and friends. After all, I need somebody else to play badminton with. And it might be fun to go swimming together.
Planning a family holiday or a Saturday afternoon activity that we all are happy with involves joint decision making. You might prefer to play badminton indoors instead of going to the park. So we need to coordinate our individual preferences. In such cases, humans display a systematic bias towards cooperative behaviour. We decide together on the basis of which option is best for the group, not for us individually.
Contrast individual decision-making with joint, cooperative, decision-making. If we at times rely on imagination when deciding what to do, we might plausibly also rely on imagination when deciding what to do together. Which role does imagination play here? If it plays any role at all, does it differ from the one it plays in individual decision-making? To be clear, this post is not primarily about psychology. It is rather for those who are into formal theories of decision-making, as well as imagination.
There are different decision-theoretic approaches to explaining rational cooperative decision-making in humans. In this post I focus on what I consider to be a plausible candidate: the theory of team reasoning. As we will see, it allows for imagination to play a special role in joint-decision making.
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