Since long time mental health professionals and the patients suffering from Major Depressive Disorder are looking for some diagnostic test and severity assessment tool which measure the suffering of patient objectively or with lesser bias. Patient themselves want to undergo some test beside psychometric tests to have more faith in diagnosis and hereby more compliant for treatment. This book provides the answer of this longstanding question in form of measurement of P300 wave in depressive patients. In our study the clinical sample consisted of 30 consecutive subjects suffering from major...