EDNE 016: Dynamic Vision 23.01.2007 Chapter 6: Metacontrast and Motion Perception (pp. 219-233 ) Thomas Otto.

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Presentation transcript:

EDNE 016: Dynamic Vision 23.01.2007 Chapter 6: Metacontrast and Motion Perception (pp. 219-233 ) Thomas Otto

A percept persists for some time after the termination of the stimulus Visual persistence A percept persists for some time after the termination of the stimulus Visual persistence is about 120 ms under daylight

Motion smear Burr (1980) Moving objects should be perceived like in a photograph with a 125 ms shutter speed

Suppression of persistence “The amount of motion smear is far less than may be expected from visual persistence” Burr (1980)

A “moving stimulus” fulfills the definition of a metacontrast mask Suppression of persistence & metacontrast A “moving stimulus” fulfills the definition of a metacontrast mask Suppression of persistence & metacontrast are similar from the perspective of PHENOMENOLOGY

Suppression of persistence & metacontrast are similar in: Phenomenology Suppression of persistence & metacontrast are similar in: - Dependence on luminance - Spatial and temporal separation - Eccentricity

- motion compensation and “fusion” - lateral inhibition Motion de-blurring models Models of motion de-blurring can be viewed as models of metacontrast There are mainly two classes based on: - motion compensation and “fusion” - lateral inhibition

Spatio-temporally oriented receptive fields Motion compensation Spatio-temporally oriented receptive fields Burr, Ross & Morrone (1986)

The RECOD model Lateral inhibition Purushothaman, Ogmen, Chen & Bedell (1998)

The RECOD model predicts extensive smear for isolated targets The RECOD model & an isolated target The RECOD model predicts extensive smear for isolated targets Purushothaman, Ogmen, Chen & Bedell (1998)

The RECOD model & multiple targets The motion smear is basically removed by the transient activity of nearby stimuli Purushothaman, Ogmen, Chen & Bedell (1998)

An isolated target appears to be extensively smeared Chen, Bedell & Ogmen (1995)

Confusing summary paragraph “These findings provide evidence against models where motion plays a causal role in metacontrast” Breitmeyer & Ogmen (2006)

Isolated target A velocity of 10 deg/s corresponds to a SOA of about 5 ms given a target-mask separation of 200”

Confusing summary paragraph “Metacontrast can improve the clarity of form perception by suppressing the smear of moving objects” “A careful parametric analysis shows that metacontrast and motion involve different mechanisms” Breitmeyer & Ogmen (2006)

Summary Suppression of persistence and metacontrast are similar from the perspective of STIMULI and PHENOMENOLOGY There might be ONE mechanism responsible for both phenomena!

Thanks for your attention! The end Thanks for your attention!

Transient and sustained activity

Experimental data vs. model prediction