Summary: Gorillas among us. Perhaps many people have experienced this: while looking for a place, they didn't notice their friends waving at them because their attention was entirely focused on finding a place which, even when they looked straight at their friends, they did not see them. There has been growing interest in the accuracy of visual representations over the past 20 years. Many studies were conducted between the 1970s and 1980s. Observers in these studies were engaged in a continuous task where they focused only on a certain angle and ignored other angles. An unexpected event occurs, however most observers report seeing nothing knowing that the visibility was clear for the subjects who were not participating in the focus on the dynamic scene. There has been a demonstration in recent years that one of the main requirements of conscious perception requires careful attention. When attention is focused on a new thing or event, subjects do not notice the unexpected object, even if it has been repaired. This is what we call inattentional blindness, which is considered the inability to notice an unexpected event or object even if it is in one's field of vision, because other tasks attract the person's attention are running. This type of experiment indicates that attention is obligatory to detect changes, even if it is not sufficient. Attention is crucial for perception because without attention, perception of the visual features of our environment does not occur. One of the studies allowed observers to view two simultaneous events. The first event showed a slapping game in which there were two players, one holding out their hands and the other placing their hands on top of their opponent's hands. The other event occurred at three o'clock...... middle of paper ...... blindness varies depending on the difficulty of the main task. Unexpected events might be more likely to be noticed by observers if they are visually similar to the main events that observers are focusing on. The results of this experiment are much more consistent with computational studies of inattentional blindness. The results of the experiments carried out so far also encourage us to pay more attention to the research results on change blindness. Change detection, as in studies of inattentional blindness, more likely depends on the focus of attention. The results of all the experiments carried out so far suggest that unexpected events are mostly ignored or ignored, knowing that in all of these experiments there was no obligation to ignore anything. However, we still wonder whether these unexpected events would leave an implicit trace or not.