We use 'hi' every day, but it's more than just a greeting. Learn the history and body language behind a first impression to master your next introduction.

A 'hi' isn't just a word; it is a delivery mechanism for warmth. It is our way of saying, 'I’m safe, I’m friendly, and I’m present,' making the other person feel seen before you try to make yourself feel heard.
Research from Princeton suggests that first impressions are formed in as little as one-tenth of a second, or 100 milliseconds. In the time it takes to say a simple greeting like "hi," the other person’s brain has already performed a "thin-slicing" diagnostic to categorize you as a friend or threat, and to determine your perceived status and trustworthiness.
According to the Stereotype Content Model, the human brain scans for warmth and competence. Crucially, warmth is always prioritized over competence because of an evolutionary "approach or avoid" reflex. If a person appears highly capable but lacks warmth, they may be perceived as predatory or untrustworthy, triggering a defensive response in others.
This framework is a storytelling method used to replace boring job titles with a value-driven narrative. You begin by stating what you are doing now (Present), mention a past achievement with specific metrics or data (Past), and conclude with your goals or where you are headed (Future). This approach turns a standard introduction into an invitation for collaboration.
To signal warmth and confidence, you should aim for the "approach signal cluster." This includes maintaining eye contact for a full two seconds, using a "Duchenne smile" that crinkles the corners of the eyes, and keeping an open body posture with palms visible. Additionally, speaking from the chest with a downward inflection at the end of sentences helps you sound authoritative rather than like you are seeking approval.
"Being yourself" can be problematic if your natural behavior is culturally insensitive to your environment. Different cultures have varying norms regarding eye contact, personal space, and directness. For example, direct eye contact is seen as engagement in the West but can be confrontational in Japan. Effective communicators use a "calibrated" version of themselves that respects local customs, such as the proper way to handle a business card or understanding different perceptions of time.
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