upstream/downstream terminology

[joshinjosh]

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what is the convention for upstream/downstream when referring to neural circuits? e.g. would i say retinal ganglionic neurons are upstream or downstream from photoreceptors?

 

[PiBond]

what is the convention for upstream/downstream when referring to neural circuits? e.g. would i say retinal ganglionic neurons are upstream or downstream from photoreceptors?

i always assumed it had to do with which way the action potential was propagating. therefore, retinal ganglionic neurons would be downstream of photoreceptors.

just my two cents