The author of a new book talks about the brain’s hidden impulses, and why you’re more biased than you think:

Of the many viral-video meltdowns pop culture has endured, few are as viscerally disturbing, as painful to watch, as Michael Richards’ racist rant during a 2006 stand-up appearance. As you’ll no doubt remember, the man better known as Kramer lashed out at a heckler in his audience with a shocking string of slurs, including the brutally memorable line, “Fifty years ago, we’d have you upside down with a fork up your ass.” The breakdown so outraged the general public that even today, if you Google “Michael Richards,” it auto-completes to “Michael Richards racist.”

Shankar Vedantam, a science writer with the Washington Post, uses the Michael Richards incident in his new book, “The Hidden Brain,” to illustrate the way he believes our unconscious can betray us — and reveal biases we wouldn’t even acknowledge to ourselves. Vedantam uses a wide array of vivid true stories to make his point: The tragic tale of a woman who is brutally beaten in front of dozens of onlookers illustrates how a crowd’s inaction can trick our brain into ignoring pleas for help; two transsexuals who’ve experienced both sides of the gender divide help illuminate how unconscious sexism can change lives.

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