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AP Psychology Videos 135 videos

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AP Psychology 1.4 Sensation and Perception 17 Views


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AP Psychology 1.4 Sensation and Perception. Who was the researcher that determined this?

Language:
English Language

Transcript

00:00

here's your shmoop du jour brought to you by bell bottom jeans.

00:07

early design sketches also included whiffle's but we're deemed too clunky.

00:11

bell bottom. alright here's today's question research conducted in the 1960s [man in baggy jeans frowns]

00:16

and 1970s led to the understanding that the physical power of a stimulus ie how

00:22

loud a sound is- is related to our perception of the magnitude of that

00:27

stimulus. researchers that determined this was puma .and here are the potential

00:33

answers. alright let's run down what each researcher was best known for. starting

00:39

with Fechner. gustav fechner was a german philosopher physicist and psychologist

00:45

best known as an early pioneer of Experimental Psychology. fechner was

00:49

credited with introducing the median into formal data analysis developing the

00:54

fechner color effect- an illusion that causes people to see color when looking

00:58

rapidly moving black and white patterns as well as producing the Weber Fechner

01:03

law which combines his own work with that of Ernst Heinrich Weber. yeah.

01:09

unfortunately the fetch new color illusion doesn't work on computer screen

01:13

so showing it to you would be pointless. try to contain your disappointment there.

01:16

anyway. Ernst was along with spatula another key founder of

01:20

Experimental Psychology and psychophysics often working with [Fetchner and Weber pictured]

01:23

sensation and touch. well the Weber Fechner law was a proposed relationship

01:28

between the magnitude of the physical stimulus and entity or strength that

01:31

people feel. sounds a lot like the question huh? I'm sure it could work that

01:35

is if Weber-fechner who actually work in the sixties and seventies and not

01:39

when they actually worked which was in the 19th century. going cross out a and

01:44

c. our next choice Leon Fetchner. he at least fits the time period he was born

01:49

in nineteen nineteen and died in 1989. unfortunately for us he was a social

01:54

psychologist best known for his social comparison theory as well as his work in

01:58

cognitive dissonance. while focusing on the latter for a second. festinger [social comparison theory explained]

02:03

believe that humans strove for internal consistency, so when two conflicting

02:08

ideas creating the internal tension within someone, for example they know

02:12

smoking gives you cancer but continue smoking

02:14

anyway, they simply ignore the conflict all together in order to continue living

02:18

a happy life. everyone owes cognitive dissonance a bit of us thank you because

02:23

without it we probably wouldn't be able to have our weekly pizza and ice cream

02:26

parties without breaking down and sobbing afterwards. we all get fat

02:29

and bad stuff they put in our bodies. great research but not our answer. well

02:34

Georg Ilyas ruler was another significant German psychologist renowned

02:39

for his work on a phenomenon called retroactive interference, which describes

02:44

when newly learned information causes us problems recalling old information. it's [man peers thoughtfully at the sky]

02:50

like if you were in the middle of learning Spanish but took a year abroad

02:53

in rome to learn italian when you return to your spanish class you'd probably

02:57

find yourself slipping into italiano which is not muy bien that's retroactive

03:02

interference. interesting yes but not the answer we're looking for when cross out

03:06

e the actual answer we're looking for is s. s Stephens. he's best

03:13

known Stephens power law. it's very similar to the vember Fechner law but

03:17

it's considered superior since it describes a wider range of sensations. it

03:21

was also developed in the 60s and 70s so it fits just as well as our

03:25

bell-bottom jeans. Fetchner-weber have ever laid the foundations for the theory that the

03:30

larger the magnitude of a stimulus the larger the just noticeable difference. [field of sunflowers]

03:34

take 20 watt light bulb in a 40 watt light bulb. they looks very different

03:38

because one is twice as powerful as the other, but if you were to take 140 watt and

03:42

160 watt light bulb now they look more or less the same even though they're

03:46

just is different numerically, as the 20 and 40 watt bulbs their work was great

03:52

but it fell short once you got into extreme values and also failed to cover

03:55

many different kinds of stimuli. Stephens improve the theory by introducing an

03:59

exponential function to the complex equation and we're not even going to try

04:02

and tackle here. ultimately he filled the holes left by previous theorists. so b is

04:07

the answer we're looking for B is in bell bottom blues, if we only had a handy

04:11

whistle we can blow it in celebration. dare to dream bell bottom blues make me [ man with bells and whistles attached to jeans]

04:18

cry.

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