sensation and perception chapters 5 & 6. some basic questions how do we sense the world?
TRANSCRIPT
Sensation and Perception
Chapters 5 & 6
Some Basic Questions
How do we sense the world?
Some Basic Questions
How do we sense the world? How do we perceive color?
Some Basic Questions
How do we sense the world? How do we perceive color? How do we perceive motion?
Some Basic Questions
How do we sense the world? How do we perceive color? How do we perceive motion? How do we perceive size and shape?
Some Basic Principles
Sensation Detecting physical energy from the environment and
encoding it as neural signals
Perception Select, organize, and interpret our sensations How our mind interprets what our senses detect
Sensation and Perception do not always cooperate
Sensation Bottom-Up Processing
analysis that begins with the sense receptors and works up to the brain’s integration of sensory information
Top-Down Processing information processing guided by higher-level
mental processes as when we construct perceptions drawing on
our experience and expectations
Sensation Our
sensory and perceptual processes work together to help us sort out complext processes
Sensation- Thresholds
Absolute Threshold minimum stimulation needed to detect a
particular stimulus 50% of the time Difference Threshold
minimum difference between two stimuli required for detection 50% of the time
just noticeable difference (JND)
Difference Threshold
Weber’s Law- to perceive as different, two stimuli must
differ by a constant minimum percentage light intensity- 8% weight- 2% tone frequency- 0.3%
Are these two colors the same?
Are these two colors the same?
Are these two colors the same?
Are these two colors the same?
Are these two colors the same?
Sensation- Thresholds
Subliminal When stimuli are
below one’s absolute threshold for conscious awareness
0
25
50
75
100
Low Absolutethreshold
Medium
Intensity of stimulus
Percentageof correctdetections
Subliminal stimuli
Subliminal Advertising
Subliminal Messages
Do subliminal messages work in songs?
Lets find out!
Sensation- Thresholds Signal Detection Theory
predicts how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise)
assumes that there is no single absolute threshold
detection depends partly on person’s experience expectations motivation level of fatigue
Can you spot the “C”
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOCOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
Can you spot the “N”
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
Can you spot the “R”?
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
Sensory adaptation- diminished sensitivity as a consequence of
constant stimulation