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"Neuroscientists Explain How the Sensation of Brain Freeze Works"
sciencedaily.com/releases/2013/05/130522095335.htm
"Brain freeze is practically a rite of summer. It happens when you eat ice cream or gulp something ice cold too quickly."

"Why Do We Get Brain Freeze? Scientists Explain"
medicalnewstoday.com/articles/244458.php
"Harvard Medical School scientists who say they have a better idea of what causes brain freeze, believe that their study could eventually pave the way to more effective treatments for various types of headaches, such as migraine-related ones, or pain caused by brain injuries."

"Banish brain freeze: New study shows how"
bodyodd.nbcnews.com/_news/2012/08/21/13379515-banish-brain-freeze-new-study-shows-how?lite
"It's a sweltering summer day, so you take a big sip of a refreshing, frozen coffee--and you're immediately doubled over with throbbing head pain."