• This photo courtesy of Richard Peterson shows Peterson posing for a portrait.  Peterson is CEO of MarketPsych, a firm that applies research from behavioral science to financial markets.  MarketPsych's computer programs attempt to gauge the market's mood by scanning news and Twitter and other social media. (Photo courtesy of Richard Peterson via AP)

    A Q&A with Wall Street’s top psychiatrist on market turmoil

    NEW YORK (AP) — When it seems like the stock market has lost its mind, big banks and investment firms often turn to one particular psychiatrist: Richard Peterson, CEO of MarketPsych, a firm that applies research from behavioral science to financial markets.