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Thresholds &
Thresholds &

Thresholds & - Description


sensory adaptation Absolute Thresholds The minimum stimulation needed to detect a particular stimulus 50 of the time Changes with age Mosquito ringtones Welsh Shopkeepers Dog Whistler Everybody raise one hand in the air when you hear the sound lower your ID: 510735 Download Presentation

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absolute threshold subliminal stimuli threshold absolute stimuli subliminal difference stimulation constant sensory adaptation hear detect time thresholds detection dog theory perceive stimulus

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Slide1

Thresholds &

sensory adaptationSlide2

Absolute Thresholds

The

minimum

stimulation needed to detect a particular stimulus 50% of the time

Changes with age

Mosquito ringtones

Welsh Shopkeepers

Dog Whistler: Everybody raise one hand in the air; when you hear the sound, lower your

armh

The point at which you can hear the dog whistle is your absolute threshold

I can hear it at 15,000 Hz (

Herz

)Slide3

Signal Detection Theory

How and when we detect the presence of faint stimuli amid background stimulation

According to theory- there is no definite absolute threshold

What factors may change the threshold?Slide4

Subliminal Stimulation-

“Below Threshold” (literally)

Below one’s threshold for conscious awareness

We CAN detect the stimulus some of the time (about half)

But do subliminal messages actually affect us?

Simple answer: NO!

Subliminal messages may prime us, but they will not actually alter our behavior

Hair Growth Subliminal

Zoolander SubliminalSlide5

Difference Threshold

Minimum difference between two stimuli required for detection 50% of the time (experienced as just noticeable difference)

Weber’s Law

To be perceived as different, two stimuli must differ by a constant percentage (rather than constant amount)Slide6

Sensory Adaptation

Diminished sensitivity as a consequence of constant stimulation

Smelly Houses

Allows us to focus on informative changes in our environment without being distracted by stimuli that are constantly present

We perceive the world NOT exactly as it is, but as it is useful for us to perceive itSlide7

Summary

What are the absolute and difference thresholds?

Do stimuli below the absolute threshold have any influence?

What does sensory adaptation allow us to do?

Shom More....
By: tatyana-admore
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Type: Public

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