What's going on inside your head when your mind wanders?
While it may feel like flipping on a screensaver,
our brain is still very much at work.
In fact, a particular group of brain regions
actually increase in activity whenever we are not focused on a task.
This is known as the default mode network.
And the functional connections typically include:
the medial prefrontal cortex, medial parietal cortex,
and medial temporal lobes.
There is still much debate
as to what these cortical associations mean, if anything at all.
One theory implicates them in introspection and mind wandering,
essentially our stream of consciousness.
This includes any thoughts not directly associated
with the immediate external environment.
Much of our waking hours are composed of stimulus independent thought,
whether it be daydreaming, planning out our future actions,
revisiting memories, or just listening to yourself buried out your day.
Another theory posits that the network's activity
is the brain's baseline of processing and information maintenance.
Separate from conscious thought,
these activations represent
how our brains consolidate experiences,
and prepare to react to the environment.
We're exposed to a constant stream
of information from our surroundings,
so maybe the default mode network activations
are somehow in charge of making sense of it all.
But though neuroscientists haven't completely agreed
on what the default mode activations mean,
it's clear that resting state research
is bursting with potential and applicability.
Various psychological disorders, including ADHD, schizophrenia,
autism, and Alzheimer's,
exhibit different types of abnormal functioning
in the default mode network.
In the end, there are many interesting directions
to take resting state research:
from picking apart the neural correlates of consciousness
to uncovering better ways to detect,
understand, and maybe even treat, psychological disorders.