The aim of this study is to observe the impact on the emotional evaluation of luminance, which is a perceptual feature of visual stimuli from electroencefelography (EEG) data recorded. EEG recordings obtained from 13 healthy individuals in the 25-45 age range were used in the study. Features obtained analysis of these records with Short Time Fourier Transform (STFT) are evaluated by statistically. The increase in the luminance level of the neutral visual stimuli as a result of statistical findings are reflected in the EEG activity, when given a bright neutral visual stimuli, comparable rates of exchange between the first 0-200 ms and 200-400ms on the electrical activity in the brain across the bright neutral stimuli to be higher than originally neutral stimulus were observed. This study has an initial research on the issue. In the following study, the difference in luminance level which regions of the brain, frequency and time, it will try to determine what caused the change.