Sensation and Perception - PowerPoint PPT Presentation

1 / 24
About This Presentation
Title:

Sensation and Perception

Description:

Sensation and Perception Chapter 4 ... Subliminal Persuasion Derren Brown and Subliminal Advertising Backmasking!! Secret messages hidden in musical lyrics? – PowerPoint PPT presentation

Number of Views:93
Avg rating:3.0/5.0
Slides: 25
Provided by: Micha975
Category:

less

Transcript and Presenter's Notes

Title: Sensation and Perception


1
Sensation and Perception
  • Chapter 4

2
Defining Sensation and Perception
  • Sensation
  • The detection of physical energy emitted or
    reflected by physical objects.
  • It occurs when energy in the external environment
    or the body stimulates receptors in the sense
    organs.
  • Perception
  • The process by which the brain organizes and
    interprets sensory information.

3
Ambiguous Figure
  • Colored surface can be either the outside front
    surface or the inside back surface
  • Cannot simultaneously be both
  • Brain can interpret the ambiguous cues two
    different ways

4
(No Transcript)
5
Sensation Perception Processes
Sense receptors Specialized cells that convert
physical energy in the environment or the body to
electrical energy that can be transmitted as
nerve impulses to the brain.
6
Sensory Overload
  • Overstimulation of the senses.
  • Lets play an observation game!
  • Can use selective attention to reduce sensory
    overload.
  • Selective attention
  • The focusing of attention on selected aspects of
    the environment and the blocking out of others.
  • Inattentional blindness
  • Cocktail-party effect
  • Change blindness people
  • Change blindness card trick

7
Measuring Senses
  • Absolute threshold
  • Difference threshold
  • Signal-detection theory

8
Absolute Threshold
  • The smallest quantity of physical energy that can
    be reliably detected by an observer.

9
Absolute Sensory Thresholds
  • Vision
  • A single candle flame from 30 miles on a dark,
    clear night
  • Hearing
  • The tick of a watch from 20 feet in total quiet
  • Smell
  • 1 drop of perfume in a 6-room apartment
  • Touch
  • The wing of a bee on your cheek, dropped from 1
    cm
  • Taste
  • 1 tsp. Sugar in 2 gal. water

10
Pledge of Allegiance
  • I pledge allegiance

11
  • to the flag

12
  • of the United States of America

13
  • and to the republic

14
  • for which it stands

15
  • one nation under God

16
  • indivisible

17
  • with liberty

18
  • and justice for all

19
JND
  • Each slide of the Pledge of Allegiance increased
    the font size. (28 to 45)
  • Did you notice?

20
Stimulus Discrimination
  • Just Noticeable Difference (JND)
  • The smallest amount of change in a stimulus that
    can be detected half the time.
  • Webers Law
  • JND is proportional to the magnitude of the
    stimulus
  • The larger the stimulus the larger the change
    must be to be noticed!!
  • Light, Weight or Tone?

21
Subliminal Persuasion
  • Derren Brown and Subliminal Advertising

22
Backmasking!!
  • Secret messages hidden in musical lyrics?
  • Lets find out!!
  • Jeffmilner.com

23
Signal-Detection Theory
  • A psychophysical theory that divides the
    detection of a sensory signal into a sensory
    process and a decision process. (expectations,
    experience, anticipation)

Stimulus is Present Stimulus is Absent
Response Present Hit False Alarm
Response Absent Miss Correct Rejection
24
Sensory Adaptation and Deprivation
  • Adaptation
  • The reduction or disappearance of sensory
    responsiveness when stimulation is unchanging or
    repetitious.
  • Prevents us from having to continuously respond
    to unimportant information.
Write a Comment
User Comments (0)
About PowerShow.com