Emotion seemed to fuel plenty of sighs by Humphrey Bogart's character Rick (right) in the 1942 film classic Casablanca, and even Rick's good friend Sam, played by actor Dooley Wilson, couldn't console him. Archive Photos/Getty Images hide caption

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Joy (left, voiced by Amy Poehler) and Sadness (voiced by Phyllis Smith) catch a ride on the Train of Thought in Pixar's Inside Out. The movie opens in theaters nationwide June 19. Disney/Pixar hide caption

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A direct, friendly gaze seems to help cement the bond of affection between people and their pooches. Dan Perez/Flickr hide caption

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Shots - Health News

Scientists Probe Puppy Love

Research shows the mutual gazing between pooches and people spurs release of a "trust hormone" in both. The results suggest dogs really may love us back.

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Can you name the 10 emotions conveyed above? The first six are basic emotions. The last four are complex emotions that combine two of the basic ones. (Check at the bottom for the answers.) Courtesy of Aleix M. Martinez hide caption

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