Download Sparse RF coverage = less effective overlap = less reorganization

Sparse RF coverage =
less effective overlap =
less reorganization?
How that might work
Small/nocturnal mammal
primary visual area
Medium size mammal
primary visual area
Large mammal
primary visual area
Visual field
representation
Neurons=x
Coverage fraction = 1/x
Neurons=10x
For same arborization,
Coverage fraction = 1/10x
Neighboring neurons’
Degree of RF overlap is largest For same amount of arborization,
Overlap is smaller than small brains Neurons=100x
Coverage fraction = 1/100x
For same amount of arborization,
Overlap is smallest – hard to recover fu.
Overlap
1 degree
Visual angle
0.5 degree
Visual angle
0.1 degree
Visual angle
n.b. these are made-up numbers, but illustrate that the same density
and arborization across cells, but with different overall numbers of cells
used to represent the visual field, leads to less overlap in adjacent neurons
for many-neuroned brains (big V1s)