Fig. 3.

The neural population we expect to interface with through a bundle of splayed optical microfibers. The spatial distribution of fibers (small pink dots) is based on the bivariate normal distribution seen in histology slices,¹⁵ and is shown in relation to the neurons (large circles) that are contributing fluorescence to the collected signal above a 1% threshold. Neurons are colored based on their fluorescence signal contribution to the fiber normalized by the maximum fluorescence signal that would be recorded when a cell is immediately under a fiber. Columns show two distinct fiber counts (with same splay parameter, $\sigma =150\mu \mathrm{m}$); rows show two distinct cell densities.