reCAPTCHA number of failures

is it possible to count the number of user failed hits?i noticed that the "verifyCallback" method is executed only in case when the user submits a successful CAPTCHA response.so is there any method to be executed in case of failure respnonse? -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.