Object perception

Question 1

Hierarchical model of object representation

Answer 1

There is feedforward convergence of hierarchical properties up to cells with highly complex and specific objects

• pontifical / grandmother cells
  -combinatory explosion (you need an infinite number of cells)

Question 2

Dynamic assembly model

Answer 2

Each cell encodes specific features but objects are encoded with dynamic assemblies via horizontal and feedback connections

Question 3

Synchrony labelling

Answer 3

Neurons in an assembly ensemble fire in sync with neurons in the same ensemble but not with those in another ensemble

Question 4

What kind of difference can synchrony discern?

Answer 4

Synchrony can encode orientation difference but not figure-ground or common fate difference

Question 5

Evidence for assembly coding

Answer 5

Moderate intercategory correlation and low intracategory correlation shows that voxel pattern is informative about which class of object you are looking at, even when major area is controlled for