9.3 Flashcards
Location in the visual world
What is the visual field?
The total area in which objects can be seen when eyes are fixed on a point
What is a receptive field?
Area of the visual field a cell (photoreceptor of RGC) responds to.
What helps a photoreceptor with it’s visual acuity?
Having the smallest receptive field
What do RGC receptive fields code for?
Location of light that is coming in the eyes
What is the order from smallest to largest of cell’s receptive fields in the visual system?
Photoreceptor, RGC, LGN
Where is the central part of the visual field represented in the occipital cortex?
At the back (disproportionally large area)
Where are peripheral areas of the visual field represented in the occipital cortex?
Anteriorly
Where is the top part of the visual field represented in the occipital cortex?
In the lower part of V1
What is receptive field hierarchy?
Higher order neurons have larger receptive fields as the receptive fields combine in the visual pathways
e.g. Multiple RGC fields combine to make LGN fields which combine to make a V1 cell’s receptive field
What is the principle of proper mass?
The amount of neural tissue responsible for a particular function is proportional to the amount of neural processing that function requires.
What is the corpus callosum’s role in the visual system?
Binds the two sides of the visual field together
The visual field is composed of thousands of small ______ of the ganglion cells
Receptive fields
List four types of cells that have visual receptive fields
Photoreceptors, RGCs, LGNs, cortical neurons
Inputs to different parts of cortical region V1 from different parts of the retina essentially form a(n) _______ of the visual world within the brain
topographic map
The two sides of the visual world are bound together as one perception by the ______
Corpus callosum
How does the principle of proper mass apply to the visual system?
The fovea is represented by a larger area in the cortex than the visual field’s periphery, and thus there is more processing of foveal information in region V1 than of peripheral information
