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> The non-linear function that relates size v to photosensory input u is assumed to be g(v)=v^2 I am having a hard time understanding this sentence - how does
by tomjakubowski 8y ago
> The non-linear function that relates size v to photosensory input u is assumed to be g(v)=v^2
I am having a hard time understanding this sentence - how does g(v) = v^2 relate the size v and the input u if the expression mentions only v?
Is it meant to be v = g(u) = u^2? Is it u = g(v) = v^2?
- yorwba 8y ago"We assume that this signal [i.e. u] is normally distributed with mean g(v) and variance Σ_v." That means that there's no deterministic function that fixes u for a given v, but only a distribution of possible values. (It's closer to u = v^2 than the opposite, though.) The precise relationship is expressed symbolically in the likelihood function given in the next part.
- tomjakubowski 8y agoThank you!