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Lecture 18

lecture 18 notes

2 Pages
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Department
Psychology
Course Code
PSYA01H3
Professor
Steve Joordens

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LECTURE 18
CHAPTER 5: SENSATIONS
We present it with ane energy level below the level a person can consciously detect-
Subliminal messaging.
How big of an energy difference can you detect? Weber differences
Not being able to see it-to not see it? Just like threshold (not hearing and hearing)
1st psychology experiment by Jastrow on the ability of subliminal perception. The
experimenter made the individual guess the cards (number or an alphabebit) and most
were 60-65% accurate. This can be a potential worry for most people because they can't
see it but their mind takes it in unconsciously.
Perception without awareness.
response bias- invidual or subject might not say the inappropriate word or what they
saw if it was inappropriate unless they were 100% they saw it.
Signal detection theory- presenting a stimulus on some trails, and not on others. It is
presented on a very low energy level. Then asking each subject from trailes to guess
whether or not the stimulus was presented. This leads to hit (stimulas was presented
and you were right), miss (stimulas was presented but you misssed it), false alarm
(stimulas wasn't presented but you said YES), and correct rejection (stimulas wasn't
presented and you got it RIGHT). You get it right on hit and correct rejection!
Bias can still have an effect, but it effects both hits and false alarms!
Some people have a low bias, they say yes only if they are sure and no if they are unsure=
low hits and low false alarms.
Hit rate=false alarm rate if you are blind.
if you can see, your hit rate should be higher than your false alarm rate!
If false alarm rate is higher than hit rate it means most likely you are doing it on
purpose..
You can get rid of a bias by manipulating your subject.
You can't get rid of bias-you can never sperate it from your experiments. That's what
signal detection proves.
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Description
LECTURE 18 CHAPTER 5: SENSATIONS We present it with ane energy level below the level a person can consciously detect- Subliminal messaging. How big of an energy difference can you detect? Weber differences Not being able to see it-to not see it? Just like threshold (not hearing and hearing) 1st psychology experiment by Jastrow on the ability of subliminal perception. The experimenter made the individual guess the cards (number or an alphabebit) and most were 60-65% accurate. This can be a potential worry for most people because they cant see it but their mind takes it in unconsciously. Perception without awareness. response bias- invidual or subject might not say the inappropriate word or what they saw if it was inappropriate unless they were 100% they saw it. Signal detection theory- presenting a stimulus on some trails, and not on others. It is presented on a very low energy level. Then asking each subject
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