Johnson-Laird and Wason 1970 Experiment: Testing Hypotheses
Explore the Johnson-Laird and Wason 1970 experiment on hypothesis testing. Learn how subjects reasoned with white and black triangles in cognitive psychology.
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.
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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
Frequently Asked Questions
The Johnson-Laird and Wason 1970 experiment was designed to investigate how individuals engage in hypothesis testing and deductive reasoning. By presenting subjects with boxes of white and black triangles, the researchers aimed to observe the cognitive processes people use to verify or falsify a specific rule. This study remains a foundational piece of cognitive psychology, highlighting how humans approach logical tasks and the common biases that influence their decision-making.
In this specific experiment, subjects were presented with two boxes: one containing white triangles and another containing black triangles. They were asked to evaluate a hypothesis, such as whether all triangles were white, and then determine what actions were necessary to test that claim. This setup allowed Peter Wason and Philip Johnson-Laird to analyze whether participants sought out confirming evidence or attempted to find counterexamples to disprove the hypothesis.
The study was conducted by Peter Wason and Philip Johnson-Laird, two influential figures in the field of cognitive psychology. Their collaboration in 1970 focused heavily on deductive reasoning and the mental models people construct when faced with logical problems. Their work, including this triangle experiment, has significantly shaped our understanding of how the human mind processes information and tests the validity of various rules and hypotheses.
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From Columbia University alumni built in San Francisco
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
