When the participants were seeing each of the other images, they heard a spoken number, such as 3, 8 or 4, which they had to keep in mind until the next trial, when they indicated whether it was odd or even.
The researchers said that the participants had to listen to a new number on every trial, and press a button to complete the number task.
They said that it could be said in other words that the participants could focus on memorizing half of the images, but were greatly distracted from memorizing the others.
A short time later, they viewed pairs of similar kaleidoscope images in a recognition test.
"Remarkably, people were more accurate in selecting the old image when they had been distracted than when they had paid full attention. They also were more accurate when they claimed to be guessing than when they registered some familiarity for the image," Paller said.
While splitting attention during a memory test usually makes memory worse, Paller said: "But our research showed that even when people weren't paying as much attention, their visual system was storing information quite well."
The researcher added: "The novel results show that when people try to remember, they can know more than they think they know."
Writing about their findings in the journal Nature Neuroscience, the researchers revealed that their study built upon a body of research that shows that amnesia victims with severe memory problems often have strong implicit memories.
They said that their work indicated that people should not rely only on conscious memory.
"It suggests that we also need to develop our intuitive nature and creativity. Intuition may have an important role in finding answers to all sorts of problems in everyday life - including big ones such as our ailing economy," Paler said.
Source-ANI
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