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    Categories>Psychology>Johnson-Laird and Wason 1970 Experiment: Testing Hypotheses

    Johnson-Laird and Wason 1970 Experiment: Testing Hypotheses

    18 min
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    Apr 24, 2026
    PsychologyPhilosophyPersonal Development

    Explore the Johnson-Laird and Wason 1970 experiment on hypothesis testing. Learn how subjects reasoned with white and black triangles in cognitive psychology.

    Johnson-Laird and Wason 1970 Experiment: Testing Hypotheses

    Best quote from Johnson-Laird and Wason 1970 Experiment: Testing Hypotheses

    “

    The only way to be sure something is true is to try as hard as you can to prove it false. This is the scientific method in a nutshell, yet it’s the hardest thing for a human brain to do.

    ”

    This audio lesson was created by a BeFreed community member

    Input question

    Johnson-Laird and Wason 1970 experiment. with two box one full of white triangles one full of black triangles and ask the subjects if they're hypothesis was true and that all the triangles were white and then asking the subjects to tell them what to do

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    Knowledge sources
    A CONFLICT BETWEEN SELECTING AND EVALUATING INFORMATION IN AN INFERENTIAL TASK
    link
    https://bpspsychub.onlinelibrary.wiley.com/doi/10.1111/j.2044-8295.1970.tb01270.x
    Insight into a logical relation
    link
    https://journals.sagepub.com/doi/10.1080/14640747008401901
    A CONFLICT BETWEEN SELECTING AND EVALUATING INFORMATION IN AN INFERENTIAL TASK
    link
    https://bpspsychub.onlinelibrary.wiley.com/doi/10.1111/j.2044-8295.1970.tb01270.x
    Insight into a logical relation
    link
    https://journals.sagepub.com/doi/10.1080/14640747008401901
    link
    https://escholarship.org/content/qt3rv0k45d/qt3rv0k45d_noSplash_8646c09c2d9744d4cabdbda295edd889.pdf?t=sgiit1

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    Key Takeaways

    1

    The Illusion of Clear Thinking

    0:00
    2

    The Triangle Trap and the Search for Proof

    1:50
    3

    The Cognitive Load of Logical Insight

    3:48
    4

    A Conflict of Interests in the Human Mind

    5:49
    5

    The Three Levels of Hidden Insight

    7:33
    6

    Why Meaning Matters More Than Logic

    9:23
    7

    The Entropy of Human Error

    11:05
    8

    The Resilience of the Confirmation Bias

    12:52
    9

    A Playbook for Better Thinking

    14:41
    10

    Reflections on the Limits of Reason

    16:26

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