Emerging research suggests that focusing on a task, or trying to remember an image, can leave us blind to things around us.

Researchers have known that when our brains are focused on a task, we can fail to see other things that are in plain sight.

A famous example of this phenomenon, known as “inattentional blindness,” is exemplified by the famous “invisible gorilla” experiment in which people watching a video of players passing around a basketball and counting the number of passes fail to observe a man in a gorilla suit walking across the centre of the screen.

The new results reveal that our visual field does not need to be cluttered with other objects to cause this “blindness” and that focusing on remembering something we have just seen is enough to make us unaware of things that happen around us.

The findings are published in the Journal of Cognitive Neuroscience.

University College of London’s professor Nilli Lavie, Ph.D., who led the study, explains: “An example of where this is relevant in the real world is when people are following directions on a satellite navigation device while driving.

“Our research would suggest that focusing on remembering the directions we’ve just seen on the screen means that we’re more likely to fail to observe other hazards around us on the road, for example an approaching motorbike or a pedestrian on a crossing, even though we may be ‘looking’ at where we’re going.”

Researchers used functional magnetic imaging scans to look at the brain activity of participants as they were given a visual memory task.

The findings revealed that while the participants were occupied with remembering an image they had just been shown, they failed to notice a flash of light that they were asked to detect, even though there was nothing else in their visual field at the time.

The participants could easily detect the flash of light when their mind was not loaded, suggesting that they had established a “load induced blindness.”

At the same time, the team observed that there was reduced activity in the area of the brain that processes incoming visual information — the primary visual cortex.

Lavie said: “The ‘blindness’ seems to be caused by a breakdown in visual messages getting to the brain at the earliest stage in the pathway of information flow, which means that while the eyes ‘see’ the object, the brain does not.”

The hypothesis that there is competition in the brain for limited information processing power is known as load theory. This supposition explains why the brain fails to detect even conspicuous events in the visual field, like the man in a gorilla suit, when attention is focused on a task that involves a high level of information load.

The new study suggests a pathway of competition (in the brain) between new visual information and our short-term visual memory.

That is, the act of remembering something we’ve seen before (that isn’t currently in our field of vision) means we may not see what we are actually looking at.

Source: Wellcome Trust