Chapter 6 Flashcards
Five types of neurons that make up the retina:
Receptors Horizontal cells Bipolar cells Amacrine cells Retinal ganglion cells
Saccades and why they are important
Involuntary eye movements of which we are unaware, but are critical because visual neurons only respond to changing images.
Function of retinal-geniculate-striate pathways:
To conduct signals to the primary visual cortex
Inferotemporal pathway
Detects shape of an object
Posterior infotemporal pathway
Detects color of an object
Posterior parietal pathway
Detects depth and movement
______are more sensitive to light, while _______have better acuity
Rods, cones
Convergence
Allows for rods to add influence to the firing upon the ganglion cell that helps us see in the dark by increasing input.
V1 refers to the…
Primary visual cortex
Primary visual cortex
Area of cerebral cortex the detects shape and color
Receptive fields
Area of retina from which a cell receives its input
Blobs
Dual-opponent color cells that occur scattered throughout V1 (primary visual cortex) in peg-like structures.
Photopigments
Unstable pigments that undergo a chemical change when exposed to light.
Lateral inhibition
A decrease in activity of one neuron caused by the stimulation of its neighbor neurons. Allows us to sense edges that enhance the contrast between an object and it’s background.
Ganglion cells are stimulated when the center of a receptive field is illuminated. This is called…
Center-on, surround-off
