Chapter 8:Chapter 8:Sensation & Sensation & PerceptionPerception

Mr. McCormickMr. McCormickPsychologyPsychology

Do-Now:Do-Now:(Discussion)(Discussion)

If you had to If you had to sacrificesacrifice one of your one of your five five sensessenses::

SightSight HearingHearing TouchTouch SmellSmell TasteTaste

Which one would it be? Why?Which one would it be? Why?

““Fraser’s Spiral”Fraser’s Spiral”

““Fraser’s Spiral”Fraser’s Spiral”

Why does this image Why does this image appearappear to be a to be a spiralspiral??

Sensation vs. PerceptionSensation vs. Perception

Sensation:Sensation: What occurs when a stimulus (change in What occurs when a stimulus (change in

environment, to which an organism responds) environment, to which an organism responds) activates a receptoractivates a receptor

Perception:Perception: The organization of sensory information into The organization of sensory information into

meaningful experiencesmeaningful experiences

““Fraser’s Spiral”Fraser’s Spiral”

In viewing “Fraser’s Spiral:”In viewing “Fraser’s Spiral:” What are we What are we sensingsensing??

What are we What are we perceivingperceiving??

How do we use How do we use sensationsensation and and perceptionperception together to together to understandunderstand our our world?world?

““The Disappearing Circle”The Disappearing Circle”

““The Disappearing Circle”The Disappearing Circle”

When focusing on the When focusing on the black dot, why does the black dot, why does the

outer grey circle outer grey circle appearappear to to fade awayfade away??

Sensory AdaptationSensory Adaptation

Sensory Adaptation:Sensory Adaptation: Senses tuned to change; adaptableSenses tuned to change; adaptable

Responsive to increases and decreases of Responsive to increases and decreases of stimulistimuli

E.g.:E.g.: Eyes adjust to darkness in a movie theatreEyes adjust to darkness in a movie theatre Skin adapts to coldness of ocean waterSkin adapts to coldness of ocean water

Sensory AdaptationSensory Adaptation

Can you think of other examples Can you think of other examples of how our senses adapt to of how our senses adapt to changes in external stimuli?changes in external stimuli?

What would happen if we did not What would happen if we did not have “sensory adaptation?”have “sensory adaptation?”

Without Sensory Adaptation..Without Sensory Adaptation..

Without sensory adaptation, the human Without sensory adaptation, the human body would be overloaded with stimuli. body would be overloaded with stimuli.

For example, right now we would be For example, right now we would be feeling the constant pressure of the feeling the constant pressure of the

clothing we are wearing, the chairs on clothing we are wearing, the chairs on which we are seated, etc.which we are seated, etc.

““The Stroop Effect”The Stroop Effect”(Part A.)(Part A.)

““The Stroop Effect”The Stroop Effect”(Part B.)(Part B.)

““The Stroop Effect”The Stroop Effect”(Part C.)(Part C.)

““The Stroop Effect”The Stroop Effect”

Why is it more Why is it more difficultdifficult to name the to name the colorscolors in in “Part C.?”“Part C.?”

The The “Stroop Effect” “Stroop Effect” illustrates how difficult it illustrates how difficult it is to ignore some kinds of stimuliis to ignore some kinds of stimuli

You were receiving two stimuli – the color and You were receiving two stimuli – the color and the word – which compete and slow you down the word – which compete and slow you down when you try to name the colorwhen you try to name the color

ReviewReview

What is the What is the differencedifference between between sensationsensation and and perceptionperception??

What is What is sensory adaptationsensory adaptation? ? WhyWhy do do humans adapt to stimuli?humans adapt to stimuli?

HomeworkHomework

Read Chapter 8.1 “Sensation”Read Chapter 8.1 “Sensation” Pgs. 206-213Pgs. 206-213

Complete Section 1 AssessmentComplete Section 1 Assessment Pg. 213Pg. 213 #s 1, 2, 4#s 1, 2, 4