Physiology: Visual field

Question 1

what 4 things need to happen in order to see something

Answer 1

• the pattern of an object must fall onto the visual receptors(cones + rods in retina)
• amount of light entering eye must be regulated(too much will ‘bleach out’ image)
• energy from waves of photons of lights must be transduced to electrical signals
• brain must receive and interpret these signals

Question 2

what is the monocular visual field

Answer 2

visual space seen by one eye

Question 3

what is the binocular visual field

Answer 3

the overlap of visual space of both eyes

Question 4

what is the retina divided in half relative to, and what are the 2 halves called

Answer 4

relative to the fovea(centre of macula)

divided into nasal and temporal hemiretina

Question 5

where does the information travel to from retina to the brain to be processed

Answer 5

visual field mapped by retina, the signal to LGN via optic nerve, then to primary visual cortex to be processed and interpreted

Question 6

what part of the primary visual cortex only receives input from one specific eye

Answer 6

layer 4

Question 7

what eye(s) can cells out with layer 4 of the primary visual cortex receive input from

Answer 7

both eyes

Question 8

how many layers does the primary visual cortex have

Answer 8

6

Question 9

what structure allows the segregation of input from each eye

Answer 9

ocular dominance columns, each column is dominated by input from one eye