Whether you are falling in love or grieving a loved one’s death, you need little convincing that emotions involve the body. Feeling without a body is like breathing without lungs. Some physical responses are easy to notice; others happen without your awareness. Indeed, many take place at the level of your brain’s neurons.

Carroll Izard (1977) isolated 10 basic emotions: joy, interest-excitement, surprise, sadness, anger, disgust, contempt, fear, shame, and guilt. Most are present in infancy (FIGURE 9.11). Other researchers believe that pride and love are also basic emotions (Shaver et al., 1996; Tracey & Robins, 2004). But Izard has argued that they are combinations of the basic 10, with love, for example, being a mixture of joy and interest-excitement. Another issue: Do our different emotions have distinct arousal footprints? (In other words, does our body know the difference between fear and anger?) Before answering that question, let’s review what happens in your autonomic nervous system when your body becomes aroused.

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As we saw in Chapter 2, in a crisis, the sympathetic division of your autonomic nervous system (ANS) mobilizes your body for action (FIGURE 9.12). It triggers your adrenal glands to release stress hormones. To provide energy, your liver pours extra sugar into your bloodstream. To help burn the sugar, your breathing rate increases to supply needed oxygen. Your heart rate and blood pressure increase. Your digestion slows, allowing blood to move away from your internal organs and toward your muscles. With blood sugar driven into the large muscles, running becomes easier. Your pupils open wider, letting in more light. To cool your stirred-up body, you perspire. If you were wounded, your blood would clot more quickly.

After your next crisis, think of this: Without any conscious effort, your body’s response to danger is wonderfully coordinated and adaptive—preparing you for fight or flight. When the crisis passes, the parasympathetic division of your ANS gradually calms your body, as stress hormones slowly leave your bloodstream.

Imagine conducting an experiment, measuring the body’s responses to different emotions. In each of four rooms, you have someone watching a movie. In the first, the person is viewing a horror show. In the second, the viewer watches an anger-provoking film. In the third, someone is watching a sexually arousing film. In the fourth, the person is viewing an utterly boring movie. From the control center, you are tracking each person’s physical responses, measuring perspiration, breathing, and heart rate. Do you think you could tell who is frightened? Who is angry? Who is sexually aroused? Who is bored?

With training, you could probably pick out the bored viewer. But spotting the bodily differences among fear, anger, and sexual arousal would be much more difficult (Barrett, 2006). Different emotions can share common biological signatures.

Despite similar bodily responses, sexual arousal, fear, and anger feel different to us, and they often look different to others. We may appear “paralyzed with fear” or “ready to explode.”

With the help of sophisticated laboratory tools, researchers have pinpointed some subtle indicators of different emotions (Lench et al., 2011). The finger temperatures and hormone secretions that accompany fear do sometimes differ from those that accompany rage (Ax, 1953; Levenson, 1992). Fear and joy stimulate different facial muscles. During fear, your brow muscles tense. During joy, muscles in your cheeks and under your eyes pull into a smile (Witvliet & Vrana, 1995).

Brain scans and EEGs reveal that some emotions also differ in their brain circuits (Panksepp, 2007). When you experience negative emotions such as disgust, your right frontal cortex is more active than your left frontal cortex. People who are prone to depression, or who have generally negative personalities, also show more activity in their right frontal lobe (Harmon-Jones et al., 2002). One not-unhappy wife reported that her husband, who had lost part of his right frontal lobe in brain surgery, became less irritable and more affectionate (Goleman, 1995). My [DM’s] father, after a right-hemisphere stroke at age 92, lived the last two years of his life with happy gratitude and nary a complaint or negative emotion.

When you experience positive moods—when you are enthusiastic, energized, and happy—your left frontal lobe will be more active. Increased left frontal lobe activity is found in people with positive personalities—jolly infants and alert, energetic, and persistently goal-directed adults (Davidson & Begley, 2012; Urry et al., 2004). When you’re happy and you know it, your brain will surely show it.

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To sum up, we can’t easily see differences in emotions from tracking heart rate, breathing, and perspiration. But facial expressions and brain activity can vary from one emotion to another. So do we, like Pinocchio, give off telltale signs when we lie? Can a lie detector—a polygraph—reveal lies? For more on that question, see Thinking Critically About: Lie Detection.