Question

1. What are illusory contours? Discuss in detail an example from the readings. What does the perception of illusory contours tell us about how mid-level vision operates?

2. Describe several of the Laws of Organization that allow us to judge distance that only require bottom-up processing?

3. What are Gestalt grouping rules? Describe each rule, including specifying an example for each.

2. Describe three ways in which the visual system compensates for aspects of the visual stimulus to give us perceptions of a stable, real physical world.

3. What does it mean to assume that the mind is modular? Make sure to clearly distinguish this view from the view that processing structures in the brain are domain general. What evidence supports the modular view and what evidence undermines it?

4. What is difference between bottom-up and top-down processing? Describe in detail an example of each from the theories of visual pattern recognition.

5. What is the difference between an early selection model of attention and a late selection model of attention? Describe an example of each kind of model, including discussing what makes it a model of that type.

5. What are “perceptual committees”? Is there ever an incident where perceptual committees fail? If so, why?

6. What is the global superiority effect? Give an example of this phenomenon. How does this impact our day-to-day lives?

7. Compare and contrast Direct and Constructivist accounts of perception.

Answer 1

1. What are illusory contours? Discuss in detail an example from the readings. What does the perception of illusory contours tell us about how mid-level vision operates?

Illusory contours are also referred to as subjective contours that would be evoking an edge perception without luminance or change of colour that would occur across edges. Illusory contours are commonly accompanied by depth ordering as well as illusory brightness.

Example of illusory contours is the most famous pac man. Illusory contours are introduced frequently in the field such that there would be formation of a shape in the edges. These are not actual shapes, but there is a perception of shape that has been created, and this becomes a prominent illusory contour.

Mid level representation would be bridging the high level and the low level edgerepresentstion. The organisation of information in the form of surfaces and objects is identified as mid level vision. There would be different elements which would be serving in the form of a single entit.y. 'This is seen when even though the shape is not complete, our perception tends to complete the picture, and see it as a complete shape.