Contrast response functions measured using the OMR in wild-type (black circles and lines) and pdzk1-KO larvae (cyan triangles and lines) at (a) 25°/s, (b) 50°/s, and (c) 100°/s. Contrast response curves are fit to the data using two-parameter piecewise functions by minimizing the least-squares error with respect to the data. Error bars show ±SEM across trials. The bottom panels show (d) response gain and (e) contrast threshold as a function of group at the three stimulus speeds tested. Error bars show 95% confidence intervals on the fitted parameter. *P < 0.05; **P < 0.01; ***P < 0.001 for the omnibus comparison of functions (upper panels) and for the comparison of individual parameters (lower panels) between genotypes.
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