L2 Flashcards
(20 cards)
At what rate do rods and cones shed their membranes and why?
High rate - it is toxic for this cell debris to accumulate in the eye
How are retinal images organised?
They are upside down and flipped side to side
What is the function of bipolar cells?
Collect information from several photoreceptors
What is the function of ganglion cells?
To collect information from several bipolar cells
What do retinal ganglion cells respond best to?
Edges/edge information
Which 2 things does inhibition over time result in?
- Troxler Fading
- After-Images
What are the 3 types of layers found in the LGN and what sizes do they refer to/represent?
- Magnocellular (large)
- Parvocellular (small)
- Koniocellular (sand-like)
Which stream is the ‘where’ stream?
Dorsal
Which stream is the ‘what’ stream?
Ventral
Which pathway/stream do magnocellular cells project to?
Dorsal, ‘where’ pathway.
Which pathway do parvocellular cells project to?
Ventral, ‘what’ pathway
What is the dorsal pathway good for?
Quick processing and changes
What is the ventral pathway good for?
- Object, facial and place recognition, requiring fine grain information
What are the various functions of V1, V2 and V3 areas?
- colour processing
- depth/3D
- detail
- texture
- edges
- contours
What does the parahippocampal place area process?
Places/landmarks
What is processed in area V5/MT?
Motion
What is a receptive field?
The area on the retina over which the behaviour of that cell can be directly influenced.
What is the neuron baseline activity level?
The rate at which neurons fire when they are not being directly stimulated.
What are concentric antagonistic receptive fields?
a range in space representing a neuron, which is responsive to light, and has a centre with the opposite sensitivity to it’s surround.
What is lateral inhibition?
Antagonism of responses across space.
