Lecture 5: perceptual organisation and gestalt psych

Question 1

low level vision

Answer 1

early vision extracting local info about lines bars and edges (everything learnt previously)

Question 2

mid level vision

Answer 2

joins isolated features (low level info) into larger groups thast more meaningful ready for object recognition in high level vision

Question 3

what are the two different pathways for visual information

Answer 3

• ventral (what - object identification)

- dorsal (where) - visuo spatial processing

Question 4

what happens to the receptive fields as the neruones increase across V1, V2, V3 etc

Answer 4

the receptive field sizes increase and the tuning of the receptive fields becomes more complex

Question 5

how do we know what to group together from low level to mid level?

Answer 5

use assumptions/prior knowledge which is also known as the gestalt principles

Question 6

Name 4 gestalt principles we look at in this course

Answer 6

proximity, similarity,

common fate and goof continuation

Question 7

gestalt principle: proximity

Answer 7

things close together in a space are bound together by our vision

Question 8

gestalt principle: similarity

Answer 8

input similar to each other are bond together

Question 9

Gestalt principle: common fate

Answer 9

This means when things move together, they are bound together

Question 10

gestalt principle: good continuation

Answer 10

our visual assumes that contours are smooth.

Question 11

limitations of gestalt principles

Answer 11

original principles largely descriptive and did not detail the mechanisms behind them and also lacked empirical evidence

Question 12

how do we know what info in a line to integrate together?

Answer 12

suggestion of an association field -