Figure 2: Vocalization
The frequency of vocalization of a ‘coo’ sound of the EGF-treated monkey was counted before (filled bar) and after risperidone treatment (RIS; 0.05 and 0.10 mg/kg: dotted bars) as well as that of a reference monkey (open bar) as described in Figure 1 legend. Bars represent mean ± SEM. *P<0.05, **P<0.01, compared with a reference monkey by two-tailed t-test (n=3 observations).