The Influence Of Stimulus Attribute On Change Blindness Under Different ISI Conditions

People used to think that they will not ignore the obvious change in the visual scene, but that is not the truth. In fact, we often miss the obvious change in the visual scene, that is "change blindness". Change blindness is affected by many factors, but researchers often pay more attention to the influencing factors such as knowledge and experience, individual differences,and less attention is paid to the factor of stimulus attributes. In addition, previous researchers mostly use scene images or stick figures as stimulus materials in their experiments, but the structure of such kind of stimulus materials are complicated, and they often have some meaning and emotional color. These may often affect participants'perception of change, and is hard to control and match their physical attributes, such as the brightness,color, background of the visual stimulus.Through two experimental studies, this paper use meaningless dots as the visual stimulus material, and use the classical "flicker paradigm" to investigate the influence caused by the stimulus quantity and the visual position of change under different ISI (interstimulus interval) conditions, and to discuss whether change blindness is affected by different levels of ISI. The experiment result shows that:(1) Stimulus quantity and the visual position of change can affect change blindness, and there is a significant interaction effect between these two factors. When the number of stimulus increased, participants are easy to become change blindness, the rate of blindness rise up remarkably, and the reaction time of change detection also extend significantly. In addition, compare to the change appeared in the central location of vision, participants' accuracy of change detection in the edge position is lower, they are more easier to become change blindness, and the reaction time is remarkably longer.(2) Different levels of ISI has effects for change blindness, participants'accuracy and reaction time of change detection under different ISI conditions shows significant difference. Relative to the ISI of 500 ms, participants'accuracy of change detection becomes higher and the reaction time become significantly shorter when the ISI is set to be 100 ms.(3) What makes change blindness happens is that the individual is interfered by the visual disturbance through the process of change detection. The interval of empty screen between picture A and A' affects the individual's change detecting process, and as the interval of empty screen (ISI) extends, the interference becomes bigger, and the participants are easy to become change blindness.