Sensation and Perception

Download Report

Transcript Sensation and Perception

Are You Highly Sensitive? A Self- test

 Read and answer survey questions  Add your total  range between 27-189  100+ = sensitive

Unit 5: Sensation and Perception

Objective 1: What are sensation & perception?

• Sensation

– the process by which our

sensory receptors

and nervous system

receive

and represent stimulus

energies

from our environment

• Perception

– process of

organizing and interpreting

sensory information, enabling us to recognize

meaning

ful objects and events

• One continuous process

Prosopagnosia

http://www.youtube.com/watch?v=dxqsBk7Wn-Y

Objective 2: What three steps are basic to all our sensory systems?

1. receive

sensory information

2. transform

that stimulation into neural impulses

3. deliver

the neural information to your brain TRANSDUCTION – the process of converting one form of energy into another form that your brain can use

Objective 3: What are absolute & difference thresholds? What is Weber’s Law?

 Absolute threshold the minimum stimulation necessary to detect a particular stimulus 50% of the time.

Thresholds

Difference Thresholds

 Difference threshold  Just noticeable difference (jnd)  Smallest difference between 2 stimuli which a subject can detect at least 50% of the time

The detectable difference increases w/ the size of the stimulus

Weber’s Law

 Two stimuli must differ by a constant proportion not a constant amount for a difference to be detected  The louder the sound is, the brighter a light is, the more you would have to change it, proportionally, to notice a difference

If the just-noticeable difference (jnd) for a 10 ounce weight is 1 ounce, the jnd for an 80 ounce weight would be _____ ounces 1 b.

2 4 d.

8 10

Joey’s bag of marbles is twice as heavy as Luke’s. If it takes 5 extra marbles to make Luke’s bag feel heavier, it will take 10 extra marbles to make Joey’s bag feel heavier. This best illustrates absolute threshold b.

sensory adaptation Weber’s Law

2 stimuli must differ by a constant proportion for their difference to be perceived

Just noticeable difference

If an adult develops cataracts, his or her

absolute threshold for light is likely to increase.

difference threshold for light is likely to decrease.

absolute threshold for light is likely to decrease.

difference threshold for light is likely to remain unchanged.

Absolute threshold for light is likely to remain the same.

Some people are better than others at detecting slight variations in the tastes of various blends of coffee. This best illustrates the importance of

Absolute threshold B.

Difference threshold Subliminal stimulation

You are going to briefly look at a picture then answer some questions. DO NOT DWELL ON THE PICTURE. Look at it long enough to “take it all in” once. After this, you will answer a series of yes/no questions. HEADS DOWN – CLOSE EYES Circus act - training a seal Costume Ball - Dancing

         

Raise Your Hand for a “Yes” Answer

In the picture, was there: an automobile? a man?

a woman?

a child?

an animal?

a whip?

a sword?

a man’s hat?

a ball?

a fish?

…Objective 3…

 Subliminal  Under awareness  Prime  To be made aware of a stimulus  to “get ready” for a stimulus  activates unconscious awareness

Objective 4: 

Subliminal Persuasion

 Messages under our awareness that get you to alter your behavior

Another One Bites The Dust http://www.youtube.com/watch?v=7MMMjLDdH-A

Objective 5 What function does sensory adaptation serve?



Sensory adaptation

 Reduced sensitivity to a repeated stimulus  Helps us notice new stimuli in our environment  Keeps our senses from getting fatigued

Perceptual Set

A mental predisposition to perceive one thing and not the other Brain Games: Seeing Isn’t Believing http://www.youtube.com/watch?v=UyGkMhWE194

Objective 6  Perceptual Set can effect what we see  Perceptual set can effect what we hear http://www.youtube.com/watch?v=G-lN8vWm3m0  Context Effects   Culture perspective