When the Perk Doesn't Work

Michael Breach

Apparently, introverts may not be getting the celebrated coffee kick we all expect and hope for. A new theory suggests that, while extroverts do benefit from a cup or two, coffee may have the opposite effect on their less outgoing brethren. And it's not just coffee. Any central nervous system stimulant, like a crowded, noisy room, for example, would do the same: http://nymag.com/scienceofus/2014/10/when-introverts-should-avoid-coffee.html