experimental design

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5 Terms

1
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extraneous variable

  • a variable other than the IV that COULD influence on the DV


2
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confounding variable

  • variable that DOES influence DV

  • effect is MIXED UP with the effect of the IV, makes it difficult to determine WHAT CAUSED THE RESULTS?




3
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random allocation

  • reduces selection bias (distributes participant characteristics across groups)

  • groups become more comparable.

  • increases internal validity


4
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what if theres no random allocation


  • groups can differ systematically EVEN BEFORE experiment begins.

  • reduces internal validity


5
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light (both blue light and normal light) detected by SCN // impact on sleep

  1. blue light detected by light sensitive neurons on the retina

  2. light related info conveyed to the SCN - regulates circadian rhythms

  3. SCN instructs pineal gland to suppress melatonin

  4. → DELAYS SLEEP ONSET