Stimulus Recognition Flashcards
LGN
lateral geniculate nucleus
Layer LGN
6 layers
Function of layers in LGN
alternate input from each eye
LGN organisation
retinotopically
Ganglion cell axon connections
1:1 with LGn projection neurons
Thalamic relay station
LGN
Receptive fields of LGN neurons
similar to receptive fields of retinal ganglion cells
Local interneurons present in
LGN
Local interneurons in LGN means
processing is occuring
Ventral stream identifies
object identity
Dorsal stream identifies
object where location
Object recognition includes
scale invariance, orientation invariance
How is object recognition studied
modeling, electrophysiology, lesions
Complexity neurons ventral stream
complexity of responses increases along the ventral stream
Key features of cortical structure
layering, columns and blobs
Different layers of cortical neurons corresponds to
different neurotransmitter release
Columnar organisation in the cortex
ocular dominance column, orientation columns, blobs
How were ocular dominance columns in visual cortex identified?
inject radioactive proline in one eye
Ocular column visual cortex input
each column receives input from either ipsilateral or contralateral eye
Hypercolumn
three types of column shown together
Hubel Wiesel experiment
moving bar
TRUE or FALSE - neuron only responds if stimulus in correct orientiation
true
hypercomplex
end stopped complex cell
Why is layering important in the cortex
process of information
Receptive fields downstream of V1 characteristics
increased size, increased complexity
No of columnar organisation in cortex
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