Confusing contours & pieces of glass

Rob van Lier, Tessa C.J. de Wit, Arno Koning

Presented by Nick van der Poel

Contents

• Introduction

• Experiment 1

• Results 1

• Experiment 2

• Results 2

• Conclusion & Discussion

Introduction

•Albert Michotte (1964)

•Kanisza square

Experiment 1

• 12 participants (students)

Experiment 1

• 12 participants (students)

• ‘Are the grey bars straight or indented?’

• 256 trials per participant

Results 1

Experiment 2

• 17 participants (students)

• Same stimuli and procedure as in Exp 1

• ‘What is the (possible) direction of shift?’

Results 2

Conclusion & Discussion

• Proportion incorrect judgements higher for the illusory surfaces

• Control group had many incorrect judgements

• Ramachandran’s checkboard illusion

• Attention and fixation