Lecture 7 - Vision

Question 1

How is visual perception a constructive process?

Answer 1

• there is a sequence to how our brain processes what we see.
• It first distinguishes patterns before forming an image.

Question 2

What are the 4 Visual Performances?

Answer 2

1. Snellen Chart
2. Absolute Threshold
3. Spatial Resolution → Contrast Sensitivity
4. Facial Recognition

Question 3

Snellen Chart

Answer 3

tests for detail and clarity (chart with letters)

Question 4

Absolute Threshold

Answer 4

dark Room looking at a dark screen, lights are flashed, your threshold is up to the level where you see the tiniest amount of light

Question 5

Spatial Resolution

Answer 5

Bars of light and dark bars. Objective is to distinguish the bars/spaces in between

Question 6

Facial recognition

Answer 6

To be able to see the subtle differences in faces

Question 7

Bottom-Up processing

Answer 7

• looking for patterns and detail to figure out an image
• processing things simultaneously

Question 8

Bottom-Up processing (low level and intermediate level)

Answer 8

Distinguishing…
- lines
- contrast
- disparity (depth where things are)
- movement
- colour
-etc.

intermediate level would be to question what it can resemble, what it is similar to, basically to make something out of those shapes/patterns

Question 9

Top-down processing

Answer 9

• seeing images we don’t expect, but with the help of priming, we are able to tell what the image is after being told