1. Do Now
What confuses about the unit so far?

2. Unit 4 : Sensation & Perception
Sensing the World

3. Introduction Sensation Perception Are one continuous process
Taking in info about the environment through our senses
EX: taking in the temp  the wind
Perception
How we organize and interpret the sensory info we take in so we can give things meaning
EX: taking in the temp  the wind  cold outside
Are one continuous process

4. Processing Bottom-up Top-down
Begins with sensory info to higher level brain thinking
Sensations  thinking
Top-down
Begins analysis with higher level thinking
Drawing from out expectations and experiences
Sensations + experiences  thinking
Flip-It Video

5. Example: Figure 4.1 Bottom Up Top-down
Sensory system (eyes) help you detect lines, angles, colors etc.
Top-down
Title of painting , expression on faces and our understanding of those expressions to giving meaning

6. Selective Attention Selective Attention Can lead to accidents
Choosing to pay attention to something
Someone give me an example
EX: cocktail party effect
When at a party talking to someone you tune out the music and everything going on around you to focus on who you are talking to
Concept enforces why listening to music while reading is dumb
Can lead to accidents

7. Selective Inattention
Inattentional blindness
When you are focusing so much on one aspect you become blind to other details
EX: when watching a movie and you don’t see the east eggs
Change blindness
Failing to notice change in the environment
EX: asking an officer or directions and failing to notice that it is a different officer
Change deafness = failing to notice change in sound
Choice blindness = failing to notice that your choice has changes
Choice-choice blindness = deny that you could fail to notice that your choice has changed
Pop-out
Stimuli that draws out attention
You can’t help but notice it

8. Thresholds Psychophysics Thresholds
EX: how loud a noise is and how we experience the noise.. Do we even notice it, can we even hear it
Thresholds
Absolute thresholds
Signal-detection theory
Subliminal stimulation
Difference thresholds

9. Absolute Thresholds Absolute threshold
The minimum amount of stimulation needed to experience (any sense) half the time
50% of the time
what is that level where you detect a stimuli and what level do you not detect
This recognition defines your personal absolute threshold
Thresholds vary with age
EX: hearing test

10. Signal Detection Signal-detection theory
a theory about how and when we will detect a stimuli amid background noise
It is determined by a person’s experience, expectations, motivation, and alertness
Flip- It

11. Subliminal Stimulation
Subliminal (below threshold)
Unconsciously sense stimuli… the unheard messages
Priming
Exposing you to things unconsciously so that when asked a questions later you choose that thing
Subliminal persuasion
Can one be manipulated with hidden persuasion… research says no

12. Difference Thresholds
add a pound to 10 lbs and you’ll notice, add 1 lb to 100lbs and you probably won’t notice
AKA just noticeable difference (JND)
Weber’s Law
to notice the difference between 2 things they have to differ by a certain percentage
The percentage varies depending on the thing
Examples?

13. Sensory Adaptation Sensory Adaptation
Diminished sensitivity as a consequence of constant stimulation
EX: when listening to really loud music for a while you don’t think it is loud anymore

14. Today Questions? Begin tonight’s HW
HW= Perceptual Organization & Perceptual Interpretation: Perceptual Adaptation