Neuroligin 2 knockout mice showed impaired discrimination but normal generalization gradients.

(A) Baseline performance (black dot) and learning curves for Nlgn2 WT mice. (B) Same as (A) for Nlgn2 knockout mice. (C-E) Comparison between Nlgn2 WT (gray dash line) and knockout (black solid line) mice. (C) Mean d’ calculated as a function of conditioning day. (D) Generalization gradients based on average performance as a function of visit tone-frequency. (E) Fitted psychometric curves and thresholds (vertical line). (F-G) Threshold and slope of the psychometric curves, respectively. Mice did not pass the goodness of fit were excluded in the individual plot.