Unit 3: Vision and Eye Movements Flashcards
L1: “Off”-center ganglion cells are ______ when light is shined in the center of their receptive fields.
inhibited
L1: “On”-center ganglion cells are ______ when light is shined in the center of their receptive fields.
excited
L1: At the optic chiasm, the _____ half of the axons decussate.
Medial
L1: Bipolar cells always supply _____ input to ganglion cells
excitatory
L1: Color information is processed in the ____ of hypercolumns in the cortex.
Blobs
L1: Damage to the MLF results in _______, in which there is loss of coordination between contralateral medial and lateral recti.
Internuclear Ophthalmoplegia (INO)
L1: In the LGN layers _____ comprise the magnocellular system.
1/2/2015
L1: In the LGN layers _____ comprise the parvocellular system.
3, 4, 5, 6
L1: INO can be distinguished from other neural problems or medial recti problems if _____ is intact.
vergence
L1: Photoreceptors are ____-polarized when they receive light.
hyper
L1: Saccades are driven _____-laterally
contra-
L1: What type of cell? Cells found at the border of ocular dominance columns
Binocular
L1: What type of cell? Maps a receptive field shape corresponding to a narrow line with specific orientation.
Simple
L1: What type of cell? Mediates depth perception, receives input from both eyes
Binocular
L1: What type of cell? Receptive fields that abstract for position such that a line/edge can be identified anywhere in the visual field
Complex
L1: What type of cell? Useful for seeing movement in the visual field
Complex
L2: _____ frontal eye field activates the _____ abducens nucleus resulting in a left saccade.
Right; left
L2: _____ frontal eye field activates the _____ abducens nucleus resulting in a right saccade.
Left; right
L2: _____: rhythmic pattern of saccades and tracking movements that occurs when watching objects go by in a car, for example
optokinetic nystagmus
L2: Ganglion cells synapse at the ______, which sends optic radiations to the visual cortex.
LGN
L2: Horizontal cells are ______ by neurotransmitter release from photoreceptors, such that shining light on the receptive field _____ horizontal cells.
excited; inhibits
L2: Horizontal cells project to nearby photoreceptors to supply _____ input.
inhibitory
L2: In the LGN, layers _____ receive input from the contralateral eye
1/4/2006
L2: In the LGN, layers _____ receive input from the ipsilateral eye
2/3/2005
L2: Lesion in the ______ decreases the accuracy of saccades
Superior colliculus
L2: Lesion in the ______ generates temporary loss of ability to make saccades.
Frontal Eye Field
L2: The Frontal Eye Field activates saccades via ______ or _______.
reticular formation, superior colliculus (to reticular formation)
L2: The magnocellular system invovles ____ receptive fields and ____ acuity.
large; low
L2: The parvocellular system involves ____ receptive fields and ____ acuity.
small; high
L2: What is the pattern generator for saccades?
Paramedian pontine reticular formation (PPRF)
L2: Which system in the LGN responds to color?
parvocellular
L2: Which system in the LGN responds to emotion?
magnocellular
