Kanizsa triangle. Kanizsa triangle Gregory’s Indirect Theory (1974) Top-down theory of perception.

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Presentation transcript:

Kanizsa triangle

Gregory’s Indirect Theory (1974) Top-down theory of perception

Gregory’s indirect theory Perception process of construction Based on: Sensory data Previous knowledge Hypothesis about what is out there

Hypothesis testing Necker cube

Hypothesis testing: Rubin’s vase

Hypothesis testing

Previous knowledge Rotating masks: http://www.michaelbach.de/ot/fcs_hollow-face/index.html

Previous knowledge

Previous knowledge What shape is this?

Muller-Lyer Illusion Which one is longer?

Depth cues

Auditory Expectations Led Zeppelin – Stairway to Heaven http://jeffmilner.com/backmasking.htm Lyrics: “Oh here’s to my sweet Satan. The one whose little path would make me sad, whose power is Satan. He’ll give those with him 666; there was a little tool shed where he made us suffer, sad Satan.”

Palmer (1975)

http://www.richardgregory.org/