Repetitious, monotonous tasks often result in a wandering mind. This daydreaming behavior is frequently criticized as a lack of discipline and an action that hinders future performance.
New research now suggests daydreaming involves more than just beating back boredom as the behavior can actually impart a cognitive advantage.
As reported in the journal Proceedings of the National Academy of Sciences, scientists at Bar-Ilan University have demonstrated that an external stimulus of low-level electricity can literally change the way we think.
They found the stimuli produces a measurable uptick in the rate at which daydreams, or spontaneous, self-directed thoughts and associations, occur.
Along the way, they made another surprising discovery: that while daydreams offer a welcome “mental escape” from boring tasks, they also have a positive, simultaneous effect on task performance.
Researchers said the study is the first to prove that a generic external stimulus unrelated to sensory perception triggers a specific type of cognitive activity.
In the experiment — designed and executed by Prof. Moshe Bar and post-doctoral researcher Dr. Vadim Axelrod — participants were treated with transcranial direct current stimulation (tDCS). tDCS is a non-invasive and painless procedure that uses low-level electricity to stimulate specific brain regions.
During the experiment participants were asked to track and respond to numerals flashed on a computer screen. They were also periodically asked to respond to an on-screen “thought probe” in which they reported on a scale of one to four the extent to which they were experiencing spontaneous thoughts unrelated to the numeric task they had been given.
In prior studies, Bar has explored the link between associative thinking, memory, and predictive ability and in this study, he used his experience to focus the stimulation on a particular part of the brain.
“We focused tDCS stimulation on the frontal lobes because this brain region has been previously implicated in mind wandering, and also because is a central locus of the executive control network that allows us to organize and plan for the future,” Bar explains, adding that he suspected that there might be a connection between the two.
As a point of comparison and in separate experiments, the researchers used tDCS to stimulate the occipital cortex – the visual processing center in the back of the brain. They also conducted control studies where no tDCS was used.
While the self-reported incidence of mind wandering was unchanged in the case of occipital and sham stimulation, it rose considerably when this stimulation was applied to the frontal lobes.
“Our results go beyond what was achieved in earlier, fMRI-based studies,” Bar states. “They demonstrate that the frontal lobes play a causal role in the production of mind wandering behavior.”
In an unanticipated finding, the present study demonstrated how the increased mind wandering behavior produced by external stimulation not only does not harm subjects’ ability to succeed at an appointed task, it actually helps.
Bar believes that this surprising result might stem from the convergence, within a single brain region, of both the “thought controlling” mechanisms of executive function and the “thought freeing” activity of spontaneous, self-directed daydreams.
“Over the last 15 or 20 years, scientists have shown that — unlike the localized neural activity associated with specific tasks — mind wandering involves the activation of a gigantic default network involving many parts of the brain,” Bar says.
“This cross-brain involvement may be involved in behavioral outcomes such as creativity and mood, and may also contribute to the ability to stay successfully on-task while the mind goes off on its merry mental way.”
While it is commonly assumed that people have a finite cognitive capacity for paying attention, Bar says that the present study suggests that the truth may be more complicated.
“Interestingly, while our study’s external stimulation increased the incidence of mind wandering, rather than reducing the subjects’ ability to complete the task, it caused task performance to become slightly improved. The external stimulation actually enhanced the subjects’ cognitive capacity.”
Future research will study the role in which external stimulation might affect other cognitive behaviors, such as the ability to focus or perform multiple tasks in parallel. And while any therapeutic application of this technique is speculative at best, Barr believes the information gained may help neuroscientists understand the behavior of people suffering from low or abnormal neural activity.
Source: Bar-Ilan University/EurekAlert