vision 3

on cell RGN

has off surround --> if light on off surround, no activity

where is firing pattern transmitted to

CNS - brain interprets brightness

apart from on ganglion cells, what others are there

off! opposite firing of on

what do direction selective ganglion cells respond to (DSGC)

image motion in the preferred direction

what do DSGC operate with

microcircuits -> depends on neuro processing in dendrites

how do neighboring neurons work

have individual receptive fields near each other and project to same target cell

what differs in neighboring neurons

response latency when activated by light -> longer for some

which neurons are activated earlier

ones with longer response latency

does it matter if a neuron is activated earlier in preferred direction

no! will reach target cell at same time

what happens in non-preferred direction

early activation = short response latency, less summation of EPSP

what is the aperture problem

The fact that when a moving object is viewed through a small window, the direction of motion may be ambiguous

what happens to information about direction and speed

it is integrated into a computation of movement of a whole object

where is information about movement integrated

middle temporal (MT or V5)

behavior of jumping spiders

courtship and hunting -> guided by vision

why do jumping spiders need good vision

make accurate movements

eyes of the jumping spiders

4 pairs! - principal, and secondary lateral eyes

principal eyes of spiders responsibility

high spatial acuity, limited field

secondary lateral eyes of spiders responsibiloty

hyper acute sensitivity, wide field

what are the anterolateral eyes important for

guiding tracking movement