How perceived causality influences perceived symmetry

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Subjects take 'bites' into account! rough ... 'bites' in symmetric & familiar shapes ... Butterfly. Heart. Bitten ellipse. Apple. Rectangle shape 10 fit to shape contour.
How perceived causality influences perceived symmetry Patrick Spröte, Filipp Schmidt & Roland W. Fleming Department of Psychology, Justus-Liebig-University Giessen, Germany

gh

ten

Apple

Ellipse

Bitten ellipse

VSS 15 annual meeting

fit to responses (non-linear PCA)

Butterfly

Heart

Kidney

Rectangle

complete

sm oo

the d

bit ten

et e pl co m shape 1

complete

bitten

smoothed

superimposed smoothed bitten conditions

gh rou neither (smooth)

Banana

shape 10

shape 2

shape 10

partly rough

rough

1,2 & 3

1,3,4 & 5

complete bitten

partly rough rough

complete bitten smoothed partly rough rough

• Subjects spontaneously compensate for ‘bites’ in symmetric & familiar shapes

Conclusion

Experiment 1

Shape A

shape skeletons (grassfire)

shape 5 shape 4

shape 7

ten

bit

Subjects take ‘bites’ into account!

‘true’ axes

shape 6

shape 6

smoothed

neither (’smooth’)

fit to shape contour (non-linear PCA)

shape 7

shape 3

Roughness does not determine ‘bite’ interpretation gh

rou

ten

rou

complete bitten smoothed

rou

gh

Task

bit neither (’smooth’)

shape 10

shape 5

bit

Experiment 3

gh

ten

rou

bit neither (’smooth’)

shape 11

shape 8

neither (smooth)

2. Dot placement

Bitten shape similarity complete compared to smoothed shape 9

How does causal interpretation of negative parts influence perceived symmetry?

1. Rating

shape 2

shape area

shape scission transformation

Transformation

perceived symmetry axis

‘true’ shape

ten

Experiment 2

Similar concavities Different causes

Interpretation changes perceptual organization bit

Introduction

Examples where the process shaping the object is salient

• For asymmetric & unfamiliar shapes subjects are uncertain about response • Reported symmetry axis changes with causal interpretation of concavity • Generative models of shape play an important role in perceptual organization and shape perception

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‘true’ shape

intrinsic properties stable, intrinsic attributes of objects: e.g. material

extrinsic properties variable, incidental attributes of scene or viewing circumstances: e.g. processes/forces

shape scission transformation

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