Perception

Question 1

What is the difference between brightness and Luminance?

Answer 1

brightness is our perception of how bright something is… luminance is the physical measure of light intensity (ie, how many lumens)

Question 2

what can influence your perception of light?

Answer 2

illumination (nature of light), reflectance(surfaces), transmittance (space between object and eye), lateral inhibition, and CONTEXT

Question 3

Patient PT, who could not pick out a face in a monet but could in a picasso, suffered from

Answer 3

achromatopsia (due to lesion)

Question 4

Patient LM suffered from akinetopsia, this prevented her from

Answer 4

perceiving motion due to lesion in parietal-temporal (probably MT/MST)

Question 5

break down visual processing : from light reflecting from a stimulus to higher order processes

Answer 5

Stimulus>light>receptors>middle layer>ganglion cells>LGN>V1>V4>V0

Question 6

Objects that are larger (or perceived to be larger) have a ___ representation in V1

Answer 6

larger

Question 7

object recognition may operate using two different approaches. What are they?

Answer 7

View Dependent and View Invariant

Question 8

The view dependent model asserts that

Answer 8

you have virtually endless templates for a single object which allow you to recognize it from many different angles; different neural representation

Question 9

the view-invariant model says

Answer 9

that one or two key features of an object are used for recognition; same neural representation regardless of viewpoint

Question 10

In order to test these theories, repetition suppression was used. Explain…

Answer 10

If neurons are activated a lot, they will eventually respond less.

Question 11

Which view would predict repetition suppression to be observed if you showed different views of an object?

Answer 11

view-invariant (same representation regardless of view)

Question 12

what is the binding problem?

Answer 12

visual processing breaks down vision into components… how to we put it back together?

Question 13

why is the grandmother or gnostic cell a terrible theory

Answer 13

a single cell representing every concept in your brain would be too many, you would lose your memory of that concept if the cell dies, signal from a single cell is not large enough to create meaningful potentials

Question 14

what are the three face processing areas

Answer 14

FFA, OFA (occipital face area) fSTS (face Superior Temporal Sulcus)

Question 15

Does FFA activate for non faces?

Answer 15

Yes, it just activates way more for faces

Question 16

the argument against FFA being face-specific was supported by what experimentors?

Answer 16

Tarr and Gauthier (the greeble experiement) , showed similar activity when showing birds to bird experts

Question 17

configural or gestalt processing is

Answer 17

processing an object as a whole by considering the relationship between them . Disrupted by inversion (thatcher illusion - FFA dependent )

Question 18

featural processing

Answer 18

evaluated by each feautre on its own - not disrupted in propasnosics