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benjamin franklin effect psychology - behavioral psychology illustration
Posted inSocial Dynamics

The Benjamin Franklin Effect: How Doing Favors Creates Liking

Posted by Mário Machado May 2, 2026
Explore the benjamin franklin effect psychology (Jecker & Landy, 1969): why asking a rival for a small favor makes them like and respect you more.
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chameleon effect psychology - behavioral psychology illustration
Posted inSocial Dynamics

The Chameleon Effect: How Subconscious Mimicry Builds Trust

Posted by Mário Machado May 2, 2026
Discover the chameleon effect psychology (Chartrand & Bargh, 1999): how subtle posture and speech mimicry triggers empathy, rapport, and social trust.
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About 99% Brain UP

Welcome to 99% Brain UP. We are a dedicated editorial team passionate about decoding human behavior, neurobiology, and the hidden mechanics of the mind. Our mission is to bridge the gap between complex behavioral science and everyday life, bringing you evidence-based insights every single day.

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Recent Posts

  • contrast principle psychology - behavioral psychology illustration
    The Contrast Principle: How Comparison Warps Your Reality
    by Mário Machado
    October 25, 2026
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    Reward Prediction Error Psychology: The Brain’s Dopamine Loop
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  • cognitive dissonance psychology - behavioral psychology illustration
    Cognitive Dissonance: Why Your Brain Justifies Inconsistencies
    by Mário Machado
    October 24, 2026
  • confirmation bias psychology - behavioral psychology illustration
    The Confirmation Bias: Why We Only See What We Believe
    by Mário Machado
    October 23, 2026

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Exploring the intersection of behavioral science and daily life. We decode the complex patterns of the human mind through evidence-based insights and fascinating psychological discoveries.

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