Brains vs. Bias: Crash Course Psychology #24

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In this episode of Crash Course Psychology, Hank takes a look at WAIS and WISC intelligence tests and how bias can really skew both results and the usefulness of those results.

Table of Contents
WAIS & WISC Tests 01:09:22
Standardization & Validity 02:13:10
IQ Performance 07:44:12

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Some Toughts (42)

  1. Avatar
    added on 7 Feb, 2019

    4:59 9:59 , why do you have hitler and a rising ghost in your background ?

  2. Avatar
    added on 18 Feb, 2019

    1:28 literarily me during exams

  3. Avatar
    added on 3 Mar, 2019

    This makes me feel hopeless. Like man I don’t wanna be average and live an average life but my intelligence is just average and sksksksk i’m a statistic i guess smh

  4. Avatar
    added on 5 Mar, 2019

    1:20 thanks reaction is the same one I get when I take a test.😅😂

  5. Avatar
    added on 11 Apr, 2019

    What is the capital of Canada?

  6. Avatar
    added on 18 Apr, 2019

    I hate Hank Green. I hate him. I want to drain his spinal fluid.

  7. Avatar
    added on 20 Apr, 2019

    does anyone see the booger its driving me insane

  8. Avatar
    added on 7 May, 2019

    he says don't let a test score define you as he is teaching an ap course lol
    i am screwed..

  9. Avatar
    added on 9 May, 2019

    Hank: don’t let a number define you
    Me at 10:00 studying for my Ap psych exam 😰

  10. Avatar
    added on 12 May, 2019


  11. Avatar
    added on 19 Jun, 2019

    Am I the only dumb Math person who's asking why 2 doesn't even belong to the group?

  12. Avatar
    added on 22 Jun, 2019

    5:06 and How big is the sample of adopted twins raised apart from each other? I don't think it's a big one.

  13. Avatar
    added on 4 Jul, 2019

    you start from the end so five jelly beans times two cause the dog took half so 10 she ate one so 11 times two again cause friend took half so 22 finally she ate one at the beginning so that all equals 23////

  14. Avatar
    added on 6 Jul, 2019

    I often think about an ex-girlfriend I had who was a fantastic example of nature and nurture. She was born to a poor 16-year-old mother in the ghetto of Chicago, but adopted almost immediately into a 1% family (who later moved here to Jersey for her to enter her sophomore year of high school). Like Annie, but with more deep dish pizza.

    Long story short, we dated in high school and again in our early to mid 20's, and I was very much in love. Coming from an upper-middle-class environment and neighborhood, I got along well with her family and they liked me very much. However, she and I would often come to loggerheads over her personal choices on things like being a cigarette smoker, wanting excessive tattoos, having a nose ring and other behaviors often associated with lower class lifestyle. Throw into the mix my Aspergers and her Histrionic Personality Disorder and it was an…interesting relationship.

    I wish her the best from the bottom of my heart, wherever she went these past 5 years, but I still think about how fascinating of a case-study she was. Almost a wolf in sheep's clothing, and it was interesting how I got along so well with her parents and often harped on her for the same things they did. Neither of us liked her smoking, tattoos, nose ring or other such behaviors. We clearly were not right for each other, but I appreciate our time together and enjoy the glimpse I got into the debate on nature versus nurture.

  15. Avatar
    added on 10 Aug, 2019

    IMHO Validity is where all intelligence tests fail. It is not possible to "measure or predict what you are supposed to" when that thing is not even well defined. The best test reliably test for something, but what they measure beyond 'the ability to take that specific test' is unclear.

  16. Avatar
    added on 9 Sep, 2019

    Do you think that fear can cause a higher iq? I used to fear the book when i was a kid. So i learned how to tell people what they want to hear at a young age to avoid the book or being belittled. Basically i am asking if you belive that people with narcissist parents can have higher iq's?

  17. Avatar
    added on 24 Oct, 2019

    23 beans

  18. Avatar
    added on 22 Nov, 2019

    I think the main factors that contribute to intelligence are genetics(maybe 45%), environment(maybe 45%) and randomness(maybe 10%).

  19. Avatar
    added on 26 Nov, 2019

    Briefly responding to the opening intelligence test questions:
    1) an instrument which creates sound by striking keys which push hammers that vibrate strings. The keys for A, A#, B, C, C#, D, D#, E, F, F#, G, and G# repeat several times on the instrument, and are typically separated into the sharp/flat/half steps, and the normal/basic notes. The sharp keys are usually smaller, and taller, while the basic keys are wider, longer, and lower.
    2) Could be the Banana, cause it is the least round, could be the strawberry, cause it has seeds on the outside, could be the blueberry, cause it has cool colors rather than warm colors, who's to say.
    3) It could be the mitt, because the glass is around the juice, but it also could be the hand bones, cause the glass gives the juice a structure and shape.
    4) The 2. The pattern is -3,+2
    5) 23 jelly beans.

  20. Avatar
    added on 26 Nov, 2019

    Wait, if a piano is an instrument played by a keyboard, does that mean that organs are pianos?

  21. Avatar
    added on 2 Jan, 2020

    Table of Contents
    WAIS & WISC Tests 01:09.22
    Standardization & Validity 02:13.10
    IQ Performance 07:44.12

  22. Avatar
    added on 6 Jan, 2020

    اختبار القدرات و التحصيلي 😂😂💔

  23. Avatar
    added on 7 Jan, 2020

    Why you fast forward we can do it

  24. Avatar
    added on 17 Jan, 2020


  25. Avatar
    added on 4 Feb, 2020

    Is it me or does he seem more bored doing psychology crash course videos than others such as science

  26. Avatar
    added on 10 Feb, 2020

    1:27 there are 23 bean

  27. Avatar
    added on 3 Mar, 2020

    I was looking down at 4:59 and looked up just to see the little burning hitler jump behind the chair. Had to rewind and watch again to make sure I wasn't hallucinating.

  28. Avatar
    added on 8 Mar, 2020

    I read that sub saharan Africans consistently score well below average.
    But I'm pretty sure it's because they don't go to school much

  29. Avatar
    added on 14 Mar, 2020

    At 10:07: Bananas are a type of berry! Although Strawberries are not berries, the Banana is, which means it's like the Blueberry. Peaches and Apples are both fruit. Strawberries are related to potatoes & tomatoes (the nightshade family) so shouldn't the STRAWBERRY be the least like the others?

  30. Avatar
    added on 26 Mar, 2020

    1:181:29. Hilarious! I love this so much. I love you man that was me during every math exam i have ever taken. WAhhhhhhhsshahahadhhfbfbcn

  31. Avatar
    added on 28 Mar, 2020

    Hank: don't let a number define you

    me at the end: I can't believe Bernice was with 23 beans I swear it was 24

  32. Avatar
    added on 9 Apr, 2020

    Is anyone gonna talk about Hermione from Harry Potter 3:02 ? MERLIN'S BEARD

  33. Avatar
    added on 13 Apr, 2020

    Is there something wrong with "which number doesn't belong to the series ?" question ?

  34. Avatar
    added on 14 Apr, 2020

    Wouldn't the strawberry be least like the others because it has the seeds on the outside it's the only one that isnt a berry?

  35. Avatar
    added on 24 Apr, 2020

    Who else has to watch this for their psychology class?

  36. Avatar
    added on 17 May, 2020

    I'd say the blueberry, since it's cool colored

  37. Avatar
    added on 19 May, 2020

    just listened to this guys voice for seven hours

  38. Avatar
    added on 26 May, 2020

    What the hell is intelegence

  39. Avatar
    added on 4 Jun, 2020

    She had 23 beans initially

  40. Avatar
    added on 6 Jun, 2020

    On the banana question, I went with bananas the gut reaction due to shape and color, but I also thought it could be the peach because leaves only have 1 seed, where all other have multiple, it could also be the strawberry since it's the only one with seeds on the outside as well as I remember reading once that a strawberry is distinctly different from a lot of fruit in the sense that the flesh isn't technically a fruit it's like a flower or something, due to some kind of weird classification, though I might be thinking of another fruit.

  41. Avatar
    added on 10 Jun, 2020

    Катюша да ижф

  42. Avatar
    added on 10 Jun, 2020

    الله صتسغ فتث لعىم خس فتهي ستخف؟

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