Figure 3.

Sensitivity to foot shock in NT4−/− and wt type mice. The sensitivity to foot shock was determined by assessing the amount of current required to elicit three stereotypical responses in NT4−/− and wt mice. Eight mice of each genotype were tested, and there was no difference between NT4−/− and wt type mice (P > 0.25). The level of current required to cause vocal responses from NT4−/− mice was lower than that of wt mice but did not reach statistical significance (P = 0.051).