Figure 1. Microelectrode array recordings from Xenopus retina.

(A) Cartoon of the experimental setup. Retinal explants are placed ganglion cell down onto planar multielectrode arrays, which in turn are positioned above a 20× air objective through which visual stimuli can be presented from a microdisplay. (B) Relative size of the multielectrode array compared to an outline of a flattened retinal eyecup from a stage 43 tadpole. (C) Example of the waveforms recorded from a single unit from a stage 46 retina across the 60 electrodes of the array. Single units are often detected by many electrodes.