monday october 18 th 2010
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Monday, October 18 th , 2010. Objective: Develop an understanding of our senses review of where we are going this unit What is Sensation and Perception View a movie to review where we are going Do Now: Write down our senses and each one’s purpose

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monday october 18 th 2010

Monday, October 18th, 2010

Objective: Develop an understanding of our senses

review of where we are going this unit

What is Sensation and Perception

View a movie to review where we are going

Do Now:

Write down our senses and each one’s purpose

What do you think sensation and perception mean?

Hand in your Project!

Sensation – what occurs when a stimulus activates a receptor
  • Perception – the organization of sensory information into meaningful experiences
Sensation and Perception
    • Sensation and Perception
      • Sensory processing and adaptation
      • Vision
      • The Other Senses:
        • Hearing
        • Touch
        • Taste
        • Smell
      • Perception
      • Subliminal Messages
      • What is real?
tuesday october 19 th
Tuesday, October 19th

Today’s Goals

    • discussion of our senses
    • discuss terms used in discussing our sensations
    • Experiment to understand absolute threshold
  • Do Now
      • What are our 6 senses?
  • Homework
      • Evaluating our senses
how many senses do we have
How many senses do we have?
  • The five we always remember, but we really do have a 6th sense….not seeing dead people, but our sense of balance.
what is the difference
What is the difference?



absolute threshold
Absolute Threshold
  • The weakest amount of a stimulus necessary to produce a sensation 50% of the time.
difference threshold
The smallest change in a physical stimulus that can be noticed half the time.

Do you notice another book in your bag if you already have 5 in it?

Difference Threshold
signal detection theory
Signal detection theory
  • Study of people’s tendencies to make correct judgments in detecting the presence of stimuli. Combines concept of ability to detect with one’s own judgments.


EXAMPLES OF THE SIGNAL DETECTION THEORYThe Classic Radar Operator Example The Shower/Phone Example The Eye Exam
weber s law
Weber’s Law
  • The larger or stronger a stimulus, the larger the change required for a person to notice that anything has happened to it.
  • This increase in a stimulus need to produce a just-noticable difference is constant:

dR = C * R

  • "equal relative increments of stimuli are proportional to equal increments of sensation."
is the room too dark well to see the same level of improvement
Is the Room too Dark? Well, to see the SAME level of improvement…
  • 1 candle x 10 = 10 candles
  • 10 candles x 10 = 100 candles
  • And for the same improvement again,
  • 100 candles x 10 = 1000 candles!

Also, handout homework – rank your senses

why are we doing this
Why are we doing this?
  • Rationale – Psychology is often considered a “hard” (versus “easy” science) because of the complexity of measuring concept of interest. Although one would think that physical stimuli would be easily measured, psychological reaction to a stimuli is not so easily measured. Today, we will evaluate the concept of absolute threshold in order to understand why this is so hard to precisely determine, as well as to further understand how one studies sensation and perception.
  • To determine absolute threshold of the sugar water using two different methods
    • Method of limits – using ascending on descending order
    • Method of Constant Stimuli – using
  • Break into groups of four
    • subject (blindfolded)
    • Experimenter (hands water to subject)
    • Recorder (Puts results on the worksheet)
    • Math wiz (averages a chart)
  • Supplies
    • blindfold
    • 10 small cups (labeled 1-10)
    • Fill each small cup with samples from the larger cups.
    • calculator

Procedure 1 (method of limits) – give subject sips in ascending and descending 4 times; average and report mean. Record response of subject.

  • Procedure 2 – Give sips according to preset random order. Record responses
  • Finish any final calculations and report results