Attention is a factor that affects the performance of various in-telligent activities in humans. Up until now, the methods formeasuring the level of attention have been mostly based onsubjective reports or employing large and costly devices. Inthis paper, a new method of estimating the level of attentionis proposed, based on posture and EEG measurements. Thesedata can be recorded using easily available and less burden-some devices. From the obtained data, the time evolution ofattention was explored. Experiments showed that there is neg-ative correlation between posture variance and attention, andalso between EEG and attention.