Abstract
Brain tumors is leading to an extreme influence on life quality and an increase in mortality, are becoming as common diagnose in the world. The identification of individual differences in cognition and well-being along with integration of modern approaches in early diagnosis of brain tumors, presurgical preparation and postsurgical rehabilitation significantly impact on the treatment of brain tumors. Existing literature showed that individual differences and personality profile influence cognitive functions preservation after surgery rehabilitation. Along with various methodological approaches to the study of brain tumors at the structural, functional, behavioral, psychophysiological levels we used psychometric measurements of cognitive functions and well-being in patients with brain tumors. In our empirical part of the study the reliability parameters of psychometric tests in Russian and Kazakh languages were analyzed. The relationships between the parameters of emotional well-being and mental state were found: the higher the emotional well-being than the lower the likelihood of problems with thinking and understanding. The results obtained can be used for better planning of postsurgical rehabilitation of brain tumor patients. Key words: brain tumors, EEG, personality traits, diagnostic tests.