Keller Fay and other commentators have noted the link between emotion and brand word of mouth (WOM) on a number of occasions. In particular, a major academic study ( On Brands and Word of Mouth) notes that emotion is a key trigger of brand buzz: &#8220;The motive to share positive or negative feelings about brands in order to express these emotions or balance emotional arousal.&#8221; A similar point is made by Wharton professor Jonah Berger in his bestselling book Contagious: Why Things Catch On, noting that emotion is one of the major ingredients that causes things to be talked about or shared: &#8220;When we care, we share.&#8221;Some emotion-driven buzz is a reaction to a brand experience or event -- a great product or service experience, an ad, etc. Brands will be doing all they can to maximize positive incidents and minimize brand &#8220;fails.&#8221; But people also have underlying and less transient emotional feelings about brands, and these too can promote and influence brand conversations.Recently, Keller Fay has joined forces with behavioural sciences experts BrainJuicer to assess the relationship between WOM and emotion and uncover new insights that brands can use to tap this powerful combination to their business advantage. Combining Keller Fay&#8217;s brand WOM volume and sentiment measures with BrainJuicer&#8217;s measures of emotional brand appeal, the study looked at these relationships across 52 of the UK&#8217;s leading brands, spread across a wide variety of sectors.The analysis shows a clear relationship between emotion and WOM: Brands which stir people&#8217;s emotions in some way are more likely to be talked about. The worst emotional response in many respects is no response at all -- a &#8220;neutral&#8221; emotional response means a brand is significantly less talked about. (We controlled for brand awareness in this analysis.)In fact, brands which provoke a more intense emotional response are significantly more likely to be discussed on a day-to-day basis -- the most &#8220;emotional&#8221; brands get three times more WOM than the least emotional:Most WOM is positive, according to the research, and indeed &#8220;happiness&#8221; is the single emotion most likely to be associated with levels of brand WOM.Of course it is positive WOM and advocacy which brands seek. We&#8217;ve also established that the emotional power of the brand is strongly associated with the sentiment of the WOM it receives. Brands which provoke positive emotion are much more likely to receive positive sentiment and recommendation during conversation. These in turn are often highly predictive of business effects -- for example, within UK supermarkets the strongest consumer sentiment was reserved for premium operator Waitrose and discounters Aldi and Lidl -- and all three have experienced strong business performance over the past year.Brand-building is not a quick-fix undertaking, and many of the strong performers in the top third on the chart above are reaping the rewards of a strong customer offer and delivery combined with vibrant communications. WOM amplifies the effects of these positive brand actions, and of course will play a role in further reinforcing the emotional appeal of brands.In summary, brands should seek to establish and reinforce strong emotional connections to maximize social relevance -- viral gimmicks might work on occasion but as a rule they are not likely the route to brand talkability. And &#8220;It&#8217;s all about the positive&#8221; -- hence deliver great brand stories and experiences to drive positive WOM and advocacy and capitalize on strong emotion.Ed Keller, CEO of the Keller Fay Group, has been called "one of the most recognized names in word of mouth." His new book, The Face-to-Face Book: Why Real Relationships Rule in a Digital Marketplace, was recently published by Free Press/Simon &amp; Schuster. You can follow Ed Keller on Twitter, Facebook and Google+, or contact him directly at firstname.lastname@example.org.Read all Ed&#8217;s MediaBizBloggers commentaries at WOM Matters.Check us out on Facebook at MediaBizBloggers.comFollow our Twitter updates at @MediaBizBloggerThe opinions and points of view expressed in this commentary are exclusively the views of the author and do not necessarily represent the views of MediaBizBloggers.com management or associated bloggers. MediaBizBloggers is an open thought leadership platform and readers may share their comments and opinions in response to all commentaries.