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. Author manuscript; available in PMC: 2021 Dec 2.
Published in final edited form as: Neuron. 2019 Mar 5;102(2):477–492.e5. doi: 10.1016/j.neuron.2019.02.010

Figure 5. SC and Posterior LP Neurons Respond More Strongly to Looming Stimuli.

Figure 5.

(A) Trajectory of the spot radius for looming stimuli at four size-to-speed ratios.

(B) Firing rate of an example neuron in posterior LP to looming stimuli depicted in (A). Dotted lines relate spot radius to time of peak firing rate. Inset: time of peak firing rate relative to collision plotted against size-to-speed ratio for the example neuron in (B) (filled black circles, left axis) and spot radius at peak firing rate plotted against size-to-speed ratio for the same neuron (open gray circles, right axis).

(C) Cumulative distribution of max loom response (Z score) across all conditions for neurons in SC (black), pLP (green), aLP (magenta), and mLP (blue). Note that, because of their low spontaneous firing rates, many SC neurons had Z scores greater than 40.

(D) Histogram of correlation between peak response time and size-to-speed ratio for cells in SC and LP subregions (colors as in C). Cells with a correlation value greater than 0.9 were classified as η-type. Open rectangles on the left represent a fraction of cells that were not responsive to looming stimuli.

(E) Location of η cells shown in a horizontal projection of LP. The gray region denotes SC-recipient LP.

(F) Cumulative distribution of checkerboard patch-background index values for η (orange, n = 55 cells) and non-η (gray, n = 150 cells) neurons in posterior LP; Wilcoxon rank-sum test.