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Fig. 6 Large- and Small-Size-Selective Responses in Periventricular Neurons (A) Top: optical section through periventricular layer in elavl3:GCaMP5G fish. Bottom: size selectivity map for the same optical section, calculated from fluorescence signals in single pixels. Unresponsive pixels appear black, and responsive pixels insensitive to size appear gray (size index near 0). Examples of nine responsive PVNs are marked by circular ROIs. Scale bar, 20 µm. (B) Fluorescence time course in ROIs as indicated in (A) in response to moving targets and full-field flash. (C) Size-tuning curves calculated from signal variance in somatic ROIs indicated in (A). Size indices are indicated above the tuning curves. (D) Frequency histogram of size indices from cell bodies in a single fish from five optical sections. (E) Frequency histogram of size indices from cell body signals accumulated in five fish.