The Dana Foundation (2016): 
A biophysical theory of beta waves.

The Osgood File (CBS Radio, 2016): 
Listen here.

NBC News (2016): 
Study finds where you lost your train of thought

The Daily Mail UK (2016):
On the tip of your tongue? The brain's 'stopping' mechanism can be triggered by sounds to derail your train of thought

Psychology Today (2016):
The Neuroscience of Losing your Focus and Train of Thought

Forbes Magazine (2014): 
The top ten brain science and psychology studies of 2013 

Forbes Magazine (2013): 
Study shows that electrical stimulation can boost the brain's brakes 

Science Daily (2013): 
Scientists improve human self-control through electrical brain stimulation 

Yahoo News (2013): 
Apply brain brakes to earn social respect