When there is a shift in attention from one place to another, the brain blinks showing momentary unconscious gaps in the visual perception, reveals a new study. These findings came as a surprise to the team of Vanderbilt psychologists who discovered the phenomenon while studying the benefits of attention.
‘Attentional blink occurs when a person is shown a series of images rapidly.’"Attention is beneficial because it increases our ability to detect visual signals even when we are looking in a different direction," said Assistant Professor of Psychology Alex Maier, who directed the study.
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"The 'mind's eye blinks' that occur every time your attention shifts are the sensory processing costs that we pay for this capability."
Details of their study are described in a paper titled "Spiking suppression precedes cued attentional enhancement of neural responses in primary visual cortex" published online by the journal Cerebral Cortex.
"There have been several behavior studies in the past that have suggested there is a cost to paying attention. But our study is the first to demonstrate a sensory brain mechanism underlying this phenomenon," said first author Michele Cox, who is a psychology doctoral student at Vanderbilt.
The research was conducted with macaque monkeys that were trained to shift their attention among different objects on a display screen while the researchers monitored the pattern of neuron activity taking place in their brains. Primates are particularly suited for the study because they can shift their attention without moving their eyes. Most animals do not have this ability.
By combining advanced recording techniques that simultaneously track large numbers of neurons with sophisticated computational analyses, the researchers discovered that the activity of the neurons in the visual cortex were momentarily disrupted when the game required the animals to shift their attention. They also traced the source of the disruptions to parts of the brain involved in guiding attention, not back to the eyes.
If the spacing between two images is too short, the observer doesn't detect the second image. In 2005, Zald determined that the time of temporary blindness following violent or erotic images was significantly longer than it is for emotionally neutral images.