Book SummaryThe Definitive Book of Body Language, by Allan Pease and Barbara Pease

1-Page Summary1-Page Book Summary of The Definitive Book of Body Language

In The Definitive Book of Body Language, communication experts and best-selling authors Allan and Barbara Pease argue that body language plays a key role in shaping interactions between people. The authors explain that during verbal interactions, people pay more attention to the facial expressions, gestures, and postures they see...

The Definitive Book of Body Language Summary Principle #1: Your Body Language Reflects *and* Influences Your Emotions

According to Allan and Barbara Pease, the first principle is that your body language—your facial expressions, gestures, and posture—always reflects your emotions. They explain that there’s a strong physiological link between your emotions and your body language. This link is bidirectional: Your emotions trigger physiological responses that get reflected in your body language, and your body language, in turn, influences your emotions and physiological responses.

Let’s explore this two-way relationship in more detail.

1) Your Body Language Reflects Your Emotions

According to the authors, each time you experience an emotion, your brain sends a signal to your body to produce a physiological response. These responses include changes to your heart or breathing rate, your blood pressure, your muscle tension, and your hormone levels. Each of these physiological changes then creates a corresponding physical response—and each physical response signals to others what you’re feeling.

Example: When you feel angry, your body releases stress hormones that cause your heart and breathing rate to increase and your muscles to tense up. These physiological changes create...

The Definitive Book of Body Language Summary Principle #2: Your Body Language Influences How People Interpret Your Words

In addition to reflecting and influencing your emotions, your body language also influences the way others interpret your words. Allan and Barbara Pease explain that, during verbal interactions, people intuitively respond to each other based more on what they see than on what they hear. They suggest that your body language accounts for 60–80% of how others perceive you. This perception determines how they interpret and respond to your words.

(Shortform note: While it’s true that body language influences the way people perceive you, there’s no scientific evidence supporting the exact percentage breakdown the authors provide. Those who quote numbers on this subject are usually mischaracterizing mid-1960s research by Albert Mehrabian, who argued that 93% of communication is nonverbal—including body language and tone of voice—and only 7% is verbal. However, this formula was created for a...

The Definitive Book of Body Language Summary Principle #3: Awareness of Body Language Improves Your Interactions

We’ve just explained how your body language has a powerful effect on both your emotions and the way others interpret and respond to your words. The authors argue that, since it plays an essential role in your interactions, awareness of body language is key to improving your communication skills. This is because it helps you consciously control both your emotions and the way others perceive you.

1) It Helps You Control Your Emotions

Allan and Barbara Pease argue that awareness of your body language helps you control your emotions during interactions. They explain that intentionally assuming different body language positions helps you experience more positive emotions.

Example: You feel nervous during a job interview and want to feel confident. You notice that you’re slumped in your chair with a frown on your face and your arms crossed. Because you understand how your body language influences your emotions, you intentionally adapt your physical presence to signal to your brain that you are confident. For instance, you sit up straight, relax your facial muscles, and unfold your arms. These changes create physiological responses in your body that make you feel...

The Definitive Book of Body Language Summary Advice on Interpreting Body Language

Before we identify individual body language cues and how to interpret them, it’s important to recognize that nonverbal cues can be subject to misinterpretation. The authors say that this is due to three reasons:

1) A single nonverbal cue can have multiple meanings depending on what other cues accompany it (much like a single word can mean different things depending on what other words are used in a sentence). For example, leaning forward can mean interest when accompanied by a smile, or it can mean aggression when accompanied by clenched fists.

2) A single nonverbal cue can have multiple meanings depending on the context in which it occurs. For example, folded arms can mean defensiveness. However, if the room is chilly, it could also mean that someone’s trying to warm themself up.

3) A single nonverbal cue can mean different things in different cultures. While most nonverbal cues are universally understood—for example, most cultures agree that smiles express positive emotions and frowns express negative ones—cultural differences remain.

(Shortform note: This guide focuses solely on how Western society interprets body language....

The Definitive Book of Body Language Summary Five Categories of Body Language Cues

Body language cues tend to fall into one of five categories, each displaying a person's level of friendliness, confidence, dominance, interest and agreement, and honesty.

(Shortform note: The authors organize body language cues according to specific body parts. We’ve chosen to organize them into these five categories to demonstrate how they relate to specific emotions or intentions.)

Let’s explore each of these categories in detail.

Category #1: Friendliness

Understanding the body language cues that express friendliness can be helpful in new social situations. You can use this information to make yourself appear more approachable, or you can use it to gauge whether other people are open to conversing with you before approaching them.

According to Allan and Barbara Pease, people who are friendly and approachable tend to hold a relaxed and open posture (for instance, standing tall with their arms held loosely by their sides), raise their eyebrows to signal that they’re happy to engage in conversation, make eye contact, and smile. On the other hand, people who don’t want to be approached tend to hold a stiff or guarded posture (for example slouching with their arms...

Shortform Exercise: How Does Your Body Language Make You Feel?

Allan and Barbara Pease suggest that intentionally changing your body language influences your emotions. Let’s explore how adopting different expressions, gestures, and postures can change the way you feel.

Notice and describe your body language and how you feel. (For example, you might be frowning, slouching in your chair, and feeling bored.)

Shortform Exercise: Practice Interpreting Body Language

Allan and Barbara Pease suggest that understanding body language helps you interpret how people feel when interacting with you. Let’s explore how you might interpret nonverbal cues in different scenarios.

During a job interview, your interviewer leans toward you, slowly nods her head, and maintains eye contact throughout the conversation. Write down at least one emotion her body language might convey.