# How can Euler diagrams improve syllogistic reasoning?

- Yuri Sato,
*Keio University*
- Koji Mineshima,
*Keio University*
- Ryo Takemura,
*Keio University*
- Mitsuhiro Okada,
*Keio University*

## Abstract

The present study investigates the question of whether and how
Euler diagrams can improve syllogistic reasoning.
Previous research reports that there is no evidence
to show the psychological advantage of Euler diagrams in solving syllogisms.
In our experiments,
we use Euler diagrams with ``named points'',
which are formulated within the simple Euler system
introduced in our previous work.
The diagrams in our system are distinctive in that
they can represent a single categorical statement by a single diagram.
It is predicated that the diagrams
improve syllogistic reasoning in general,
and in particular that some well-known errors
in linguistic syllogistic reasoning
could be blocked, mainly due to the fact that diagrams
make explicit the subject-predicate relation of a categorical statement.
The results show that the reasoning with Euler diagrams
significantly improve subjects' performance, compared to the one without
diagrams.
We also discuss some models of diagrammatic inferences
involved in solving syllogisms.

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