Change blindness is a surprising perceptual phenomenon that occurs when a change in a visual stimulus is introduced and the observer does not notice it. For example, observers often fail to notice major differences introduced into an image while it flickers off and on again. People's poor ability to detect changes has been argued to reflect fundamental limitations of human attention. Change blindness has become a highly researched topic and some have argued that it may have important practical implications in areas such as eyewitness testimony and distractions while driving.
- 1 History of change blindness
- 2 Current research (2010–2012)
- 3 Change detection paradigms
- 4 Neuroanatomy of change blindness
- 5 Factors influencing change blindness
- 6 Change blindness in other senses
- 7 Practical implications
- 8 Change blindness blindness
- 9 See also
- 10 References
- 11 Further reading
- 12 External links
History of change blindness
Early anecdotal observations of change blindness
Outside of the domain of psychology, phenomena related to change blindness have been discussed since the 19th century. When film editing was introduced in movies, editors began to notice that changes to the background were not noticed by those watching the film. Going back much earlier, William James (1842–1910) was the first to mention the lack of ability to detect change in his book Principles of Psychology. (1890) 
Earliest experimental reports of change blindness
Research on change blindness developed from investigation in other phenomena such as eye movements and working memory. Although individuals have a very good memory as to whether or not they have seen an image, they are generally poor at recalling the smaller details in that image. When we are visually stimulated with a complex picture, it is more likely that individuals retain only a gist of an image and not the image in its entirety.
The laboratory study of change blindness began in the 1970s within the context of eye movement research. McConkie conducted the first studies on change blindness involving changes in words and texts; in these studies, the changes were introduced while the observer performed a saccadic eye movement. Observers often failed to notice these changes.
In the late 1980s, the first clear experimental demonstration was published showing very poor change detection in complex displays over brief intervals without eye movements being involved. Pashler (1988) showed that observers were poor at detecting changes introduced into arrays of letters while the display was flickered off and on, even if the offset was as brief as 67 milliseconds (although offsets briefer than that produced much more effective change detection). Pashler concluded by noting how odd it was that people generally report having a "clear sense of apprehending the identities and locations of large numbers of objects in a scene" (p. 377), and that given this introspective sense, it seemed quite surprising how poor is their detection of changes.
Research in the 1990s and 2000s
With the rise of the ability to present complex, real-world images on a computer screen, Dr. George McConkie, in the early 1990s, as part of the new initiatives of the new Beckman Institute for Advanced Science and Technology, began a renewed attempt to investigate why the world looked stable and continuous despite the shifting retinal input signal that accompanied each saccade. This research began when John Grimes and Dr. George McConkie (1996) began to use actual photographs to study visual stability. This development in change blindness research was able to show the effects of change blindness in more realistic settings. Additionally, further research stated that rather large changes will not be detected when they occur during saccadic movements of the eye. In the first experiment of this kind, in 1995, Blackmore et al forced saccades by moving the image and making a change in the scene at the same time. Observers’ ability to detect the changes fell to chance. The effect was stronger using this method than when using brief grey flashes between images, although subsequent research has mostly used grey flashes or masking stimuli. Another finding based on similar studies stated that a change was easily picked up on by participants when the eye was fixated on the point of change. Therefore, the eye must be directly fixated on the area of change for it to be noticed. This was called the saccade target theory of transsaccadic memory of visual stability. However, other research in the mid-1990s has indicated that individuals still have difficulty detecting change even when they are directly fixated on a particular scene. A study by Rensink, O’Regan, & Clarke demonstrated that change blindness can have an effect even if the eye was fixated on a scene. In this study, a picture was presented followed by a blank screen or “masking” stimulus, which was followed by the initial picture with a change. The masking stimulus almost acts like a saccadic movement of the eye which makes it significantly more difficult for individuals to detect the change. This was a critical contribution to change blindness research because it demonstrated that a change can remain unnoticed with the smallest disruptions.
Research on change blindness proceeded one step further into practical applications of this phenomenon. For example, there does not have to be a masking stimulus in order for individuals to miss a change in a scene. Individuals often take significantly longer to notice certain changes if there are a few small, high contrast shapes that are temporarily splattered over a picture. This method for testing change blindness is called “mudsplashes”. This method is particularly relevant to individuals driving in a car when there is a visual obstruction on the windshield. This obstruction may impair an individual’s ability to detect a change in their environment which could result in severe negative consequences while driving.
Current research (2010–2012)
Research indicates that detecting changes in a change blindness task is easier when items are holistically processed, such as faces. Individuals notice a change faster when required to detect changes in facial features than when required to detect changes in images of houses. However, individuals are better at identifying the nature of the change in houses.
Other researchers have discovered that mental processing in change blindness begins even before the change is presented. More specifically, there is increased brain activity in the parietal-occipital and occipital regions prior to the emergence of a change in a change blindness task.
Researchers have also indicated there is a difference in brain activity between detecting a change and identifying change in an image. Detecting a change is associated with a higher ERP (Event-related potential) whereas identifying change is associated with an increased ERP before and after the change was presented.
Additional research using fluctuations in ERPs (Event-related potentials) has observed that changes in pictures (change blindness) are represented in the brain, even without the perceiver’s conscious awareness of the change.
Lucid dreaming occurs when one realizes that the events experienced within a dream are bizarre or would not occur in one’s waking life. As such, the inability to notice the bizarre nature of the dream has been coined as an example of change blindness, also known as individuals who are non-lucid dreamers. However, a recent study found that lucid dreamers did not perform better on a change blindness task than non-lucid dreamers. Therefore, the relation between lucid dreamers and change blindness has been discredited to some degree.
Change blindness in teams
Another interesting area of research is the decreased susceptibility to change blindness when individuals are placed in teams. Although change blindness is still observed within teams, research has indicated that changes between images are noticed more when individuals work in teams as opposed to individually. Both teamwork and communication assist teams in correctly identifying changes between images.
Expertise and change blindness
Another recent study looked at the relation between expertise and change blindness. Physics experts were more likely to notice a change between two physics problems than novices. It is hypothesized that experts are better at analyzing problems on a deeper level whereas novices employ a surface-level analysis. This research suggests that observing the phenomenon of change blindness may be conditional upon the context of the task.
Cognitive psychologists expanded the study of Change Blindness into decision-making. In one study, they showed participants ten pairs of faces and asked them to choose which face was more attractive. For some pairs, the experimenter used sleight of hand to show participants a face they had NOT chosen. Only 26% of subjects noticed the mismatch between their choice of face and the different face they were shown instead. The experimenters tested pairs of faces that were either high in similarity or low in similarity, but the detection rate was no different between those conditions. Subjects were also asked to give reasons why they had chosen a face (although due to the sleight of hand they actually hadn't chosen it). Despite the mismatch, subjects gave responses that were comparable in emotionality, specificity, and certainty for faces they had or had not actually chosen. Further research has showed that the failure to detect mismatches between intention and outcome exists in consumer product choices  and in political attitudes.
Change detection paradigms
Saccade forcing paradigm
This method was used in the first, 1995, experiment. A change is made in an image at the same time as the image is moved in an unpredictable direction, forcing a saccade. This method mimics eye movements and can detect change blindness without introducing blank screens, masking stimuli or mudsplashes.
In this paradigm, an image and an altered image are switched back and forth with a blank screen in the middle. This procedure is performed at a very high rate and observers are told to click a button as soon as they see the difference between the two images. This method of studying change blindness has helped researchers discover two very important findings. The first finding is that it usually takes a while for individuals to notice a change even though they are being instructed to search for a change. In some cases, it can even take individuals over one minute of constant flickers to determine the location of the change. The second important finding is that changes towards the middle of a picture are noticed at a faster rate than changes on the side of a picture. Although the flicker paradigm was first used in the late 1990s, it is still commonly used in current research on change blindness and has contributed to current knowledge on change blindness.
Forced choice detection paradigm
Individuals who are tested under the forced choice paradigm are only allowed to view the two pictures once before they make a choice. Both images are also shown for the same amount of time. The flicker paradigm and the forced choice detection paradigm are known as intentional change detection tasks, which means that the participants know they are trying to detect change. These studies have shown that even while participants are focusing their attention and searching for a change, the change may remain unnoticed.
Mudsplashes are small, high contrast shapes that are scattered over an image, but do not cover the area of the picture in which the change occurs. This mudsplash effect prevents individuals from noticing the change between the two pictures. A practical application of this paradigm is that dangerous stimuli in a scene may not be noticed if there are slight obstructions in an individual's visual field. Previously, it has been stated that humans hold a very good internal representation of visual stimuli. Studies involving mudsplashes have shown that change blindness may occur because our internal representations of visual stimuli may be much worse than previous studies have shown. Mudsplashes have not been used as frequently as the flicker or forced choice detection paradigms in change blindness research, but have yielded many significant and groundbreaking results.
The foreground-background segregation method for studying change blindness uses photographs of scenery with a distinct foreground and background. Researchers using this paradigm have found that individuals are usually able to recognize relatively small changes in the foreground of an image. In addition, large changes to the colour of the background take significantly longer to detect. This paradigm is critical to change blindness research because many previous studies have not examined the location of changes in the visual field.
Neuroanatomy of change blindness
Various studies have used MRI’s (Magnetic Resonance Imaging) to measure brain activity when individuals detect (or fail to detect) a change in the environment. When individuals detect a change, the neural networks of the parietal and right dorsolateral prefrontal lobe regions are strongly activated. If individuals were instructed to detect changes in faces, the fusiform face area was also significantly activated. In addition, other structures such as the pulvinar, cerebellum, and inferior temporal gyrus also showed an increase in activation when individuals reported a change. It has been proposed that the parietal and frontal cortex along with the cerebellum and pulvinar might be used to direct an organism’s attention to a change in the environment. A decrease of activation in these brain areas was observed if a change was not detected by the organism. Furthermore, the neurological activation of these highlighted brain areas was correlated with an individual’s conscious awareness of change and not the physical change itself.
Other studies using fMRI (Functional Magnetic Resonance Imaging) scanners have shown that when change is not consciously detected, there was a significant decrease in the dorsolateral prefrontal and parietal lobe regions. These results further the importance of the dorsolateral prefrontal and parietal cortext in the detection of visual change. In addition to fMRI studies, recent research has used transcranial magnetic stimulation (TMS) in order to inhibit areas of the brain while participants were instructed to try to detect the change between two images. The results show that when the posterior parietal cortex (PPC) is inhibited, individuals are significantly slower at detecting change. The PPC is critical for encoding and maintaining visual images in short term working memory, which demonstrates the importance of the PPC in terms of detecting changes between images. For a change to be detected, the information of the first picture needs to be held in working memory and compared to the second picture. If the PPC is inhibited, the area of the brain responsible for encoding visual images will not function properly. The information will not be encoded and will not be held in working memory and compared to the second picture, thus inducing change blindness.
Role of attention
The role of attention is critical for an organism’s ability to detect change. In order for an organism to detect change, visual stimulation must enter through eye and proceed through the visual stream in the brain. A study in 2004 demonstrated that if the superior colliculus (responsible for eye movements) of a monkey’s brain is electrically stimulated, there would be a significant decrease in reaction time to detect the change. Therefore, it is critical for organisms to attend to the change in order for it to be detected. Organisms are only able to detect this change once the visual stimulation comes through the eye (its movements are controlled by the superior colliculus) and is subsequently processed through the visual stream.
Factors influencing change blindness
Age has been implicated as one of the factors which modulates the severity of change blindness. In a study conducted by Veiel et al. it was found that older individuals were slower to detect the changes in a change blindness experiment than were younger individuals. This trend was also noticed by Caird et al., who found that drivers aged 65 and older were more prone to making incorrect decisions after a change blindness paradigm was used at an intersection, than were participants aged 18–64.
Attention is another factor that has been implicated in change blindness. Increasing shifts in attention decrease the severity of change blindness and changes in the foreground are detected more readily than changes made to the background of an image, an effect of the intentional bias for foreground elements.
Object presentation is the way in which objects appear and is a factor that determines the occurrence of change blindness. Change blindness can occur even without a delay between the original image and the altered image, but only if the change in the image forces the viewer to redefine the objects in the image. Additionally, the appearance of a new object is more resistant to change blindness than a looming object, and both the appearance of a new object and the looming of an object are more resistant to change blindness than the receding of an object. Furthermore, the appearance or onset of an object is more resistant to the occurrence of change blindness than the disappearance or offset of an object.
Substance use has been found to affect the detection biases on change detection tasks. If an individual was presented with two changes simultaneously, those that had a change related to the substance they use regularly reported using the substance more than those detecting the neutral stimuli. This indicates a relationship between substance use and change detection within a change blindness paradigm. This bias for devoting more attention to the drug-relevant stimuli is also observed with problem drinkers. Individuals who have a more severe drinking problem are quicker to detect changes in alcohol-related stimuli than in neutral stimuli.
Change blindness in other senses
In addition to change blindness induced by changes in visual images, change blindness also exists for the other senses:
- Change deafness - change blindness for auditory information.
- Olfactory - human is constantly in a state of change blindness due to the poor spatial and temporal resolutions with which scents are detected.
- Somatosensory - change blindness for tactile stimuli has been observed using the mudsplash paradigm for change blindness.
The phenomenon of change blindness has practical implications in the following areas:
Research in change blindness has uncovered the possibility of inaccuracy in eyewitness testimony. In many cases, witnesses are rarely able to detect a change in the criminal's identity unless first intending to remember the incident in question. This inability to detect a change in identity can lead to inaccuracy in identifying criminals, mistaken eyewitness identification, and wrongful conviction. Therefore, eyewitness testimonies should be handled with caution in court in order to avoid any of these negative consequences.
Older drivers make more incorrect decisions than younger drivers when faced with a change in the scene at an intersection. This can be attributed to the fact that older individuals notice change at a slower rate compared to younger individuals. In addition, the location and relevance of changes have an effect on what is noticed while driving. The reaction time to changes in the driver's peripherals is much slower than the reaction time to changes that occur towards the center of the driver's visual field. Furthermore, drivers are also able to recognize more relevant changes as opposed to irrelevant ones. Research on the effects of change blindness while driving could provide insight into potential explanations of why car accidents occur.
Military command and control personnel who monitor multiple displays have a delayed time to accurately identify changes due to the necessity of verifying the changes, as well as the effective 'guessing' on some trials. Due to the fact that control personnel have delayed reaction because of change blindness, an interface design of computer work stations may be extremely beneficial to improve the reaction time and accuracy.
Change blindness blindness
Change blindness blindness is defined as a misplaced confidence in one’s ability to correctly identify visual changes. People are fairly confident in their ability to detect a change, but most people exhibit poor performance on a change blindness task.
Factors affecting change blindness blindness
- Perceived Success - A higher perception of success from previous experience inflates the individual’s confidence for success in future experiences.
- Search Time - A longer time spent looking for the visual change creates the impression of poor performance on the task. In other words, a shorter time in identifying a visual change creates the impression of good performance and thus the individual will be overconfident in this ability.
Spotlight effect and change blindness blindness
The spotlight effect is a social phenomenon that is defined as an overestimation of the ability of others to notice us. A seemingly obvious change such as another individual changing a sweater during a memory task is rarely noticed. However, the individuals switching the sweater tend to overestimate the ability of the test writers to notice the change in sweaters. In the spotlight effect, this poor performance is a result of the overestimation of others’ ability to notice us whereas in change blindness blindness it is the overestimation of others’ ability to notice the sweater change. In other words, it is the distinction between noticing differences on a person and noticing differences between any images.
- Change deafness
- Inattentional blindness
- Introspection illusion
- Motion blindness
- Selective attention
- Salience (neuroscience)
- Spot the difference
- Visual short term memory
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- Examples of change blindness
- Ten demos of change blindness at the University of British Columbia (requires QuickTime)
- Demos at the University of Illinois of gradual changes to scenes and examples of motion-picture based change detection. Also includes demonstrations of inattentional blindness. (requires QuickTime and some require Java)
- Dan Dennett's 2003 talk at TED shows some visual illusions including several striking examples of change blindness.
- Re-creation of Simons & Levin experiment by British illusionist Derren Brown