Visual System Flashcards
What is the preferred sensory modality in humans?
Vision
What are the 2 components of the visual system?
Sensory and motor
What are the individual parts of the visual sensory system?
Sensation, central pathway, and perception
What is the visual motor system responsible for?
Positioning the receptors to capture and maintain the desired visual target
Perception can change even when…
the image on your retina is constant
Perception is not a replica of the retinal image, its…
an interpretation of visual information arriving at V1
What does the anterior chamber of the eye contain?
The aqueous humor, iris, lens, and ciliary muscles
What does the posterior chamber of the eye contain?
The vitreous humor, retina, optic disk, optic nerve, choroid, and sclera
What does the retina contain?
Macula lutea, fovea centralis, nasal hemiretina, and temporal hemiretina
What type of cells are first order neurons of the visual system?
Bipolar cells
What type of cells are second order neurons of the visual system?
Ganglion cells
Characteristics of rods
Motion detectors, low resolution, detect black/white, 120 million
Characteristics of cones
Color detectors, rgb, 6 million
When are rods most useful?
At night, thus very sensitive to light
Where are rods most concentrated?
Toward the periphery