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Flashcards in Chapter 3 Deck (22):
1

simple cortical cells

side by side receptive fields

bars of light/lines

particular to orientation

2

end-stopped cell neurons

moving lines of specific length and orientation

moving corners/angles

3

3 coding theories

specificity

distributed

sparse

4

Simultaneous contrast

effect of surrounding one color with another color that changes the appearance of the surrounded one

5

As you move ____ from retina neurons require more _____ to fire

farther

complexity

5

neural plasticity

neurons learn to fire certain stimuli

specialization is shaped by experience

5

selective adaptation

firing causes neurons to fatigue and adapt

eventually need more contrast

5

cortical magnification factor

more cortical area for the fovea than the rest of retina

fovea = .01% of retina and receives 8-10% of processing

5

sparse coding

object represented by small group of neurons

one neuron can respond to more than one stimulus

7

Describe layers one and two of LGN

magnocellular

dealing with movement

8

Types of neurons in visual cortex

simple cortical

complex cells

end-stopped cells

10

Layers of LGN

Ipsilateral eye (2, 3, 5) - same side eye

Contralateral eye (1, 4, 6) - opposite side eye

12

Describe the flow of info to/from LGN

Regulates info - sends less to cortex than what is received from eye

Receives more signals from cortex than retina (feedback)

13

specificity coding

a particular object is represented in the brain by 1 neuron that responds only to that and nothing else

14

Describe layers 3 - 6 in LGN

parvocellular

color, shape, etc.

15

grandmother cell

the neuron that responds only to the specific stimulus

17

LGN

lateral genticulate nucleus

part of thalamus 

retinotropic mapping

18

belongingness

appearance is influenced by surroundings an area seems to belong to

 

lateral inhibition cannot account for this

19

complex cell neurons

movement in the correct orientation and the correct direction

20

receptive field

region of retina that must receive light in order to get a response in a given fiber

21

distributed coding

object represented by large group of neurons firing

22

optic nerve

made up of axons of ganglion cells