1. A method of collecting and analyzing complex auditory brainstem response, the method comprising: presenting at least one complex auditory stimulus to a subject; acquiring the subject's complex auditory brainstem response; averaging complex auditory brainstem responses from the subject in at least one of a time domain and a frequency domain to form a collected response; analyzing the collected response using a signal processor to process the collected response to provide a processed output and to adapt the response for comparison to the at least one complex auditory stimulus; and performing statistical computations on the processed output to generate visual and data feedback for a user.