Relate size increase to seeing

• What are the two possible responses given by the perceiver in the image?

  "Yes" and "No"
• What is the absolute threshold?

  The minimum stimulus energy for detection
• What are the four possible outcomes shown in the image?

  Hit, Miss, False alarm, Correct rejection
• How does psychophysics measure sensory experiences?

  By conducting experiments to quantify experiences
• How does psychophysics help determine visibility of light?

  By finding brightness needed for perception
• How does psychophysics assist in understanding sound perception?

  By determining loudness required for hearing
• How do absolute threshold and difference threshold differ?

  • Absolute threshold: minimum stimulus to detect something
  • Difference threshold: smallest change to notice a difference
• Why is the absolute threshold important in detection tasks?

  It determines the minimum stimulus needed for detection
• How are the four possible outcomes in the image related to the perceiver's response and the actual stimulus?

  • Hit: Perceiver responds "Yes" and the stimulus is present
  • Miss: Perceiver responds "No" and the stimulus is present
  • False alarm: Perceiver responds "Yes" and the stimulus is absent
  • Correct rejection: Perceiver responds "No" and the stimulus is absent
• What are the key aspects of psychophysics?

  • Sensory Perception: How we perceive sensations
  • Physical Stimuli: Factors triggering our senses
  • Measurements: Quantifying sensory experiences through experiments
• What is the label for the comparison that is selected 75% of the time?

  Comparison selected 75% of the time
• What is the relationship between physical stimuli and sensory perception in psychophysics?


  Physical stimuli trigger and shape sensory experiences
• What is the name of the response given by the perceiver in the image?

  Perceiver's response
• What does a "miss" mean in a detection task?

  Failing to detect a present stimulus
• What does the psychometric function represent in relation to JND?

  Stimulus change needed for correct responses
• What are the four possible outcomes in a detection task?

  1. Hit: Correctly reporting stimulus present
  2. Miss: Failing to detect present stimulus
  3. False alarm: Reporting stimulus when absent
  4. Correct rejection: Correctly reporting stimulus absent
• What does "correct rejection" indicate in a detection task?

  Correctly reporting the stimulus is absent
• What does a JND indicate in practical terms?

  Amount needed to notice a stimulus change
• What is the relationship between absolute threshold and difference threshold?

  • Absolute threshold indicates initial detection
  • Difference threshold indicates change detection
• What is the purpose of this image?

  To illustrate a scientific concept or pattern
• How does one JND relate to response accuracy?

  Moves from 50% to 75% correct responses
• How is absolute threshold measured in a hearing test?

  By finding the quietest sound detectable
• What does JND stand for in perception?

  Just noticeable difference
• What is the significance of detecting a stimulus 50% of the time?

  It defines the absolute threshold for detection
• What are the key differences between the two types of comparisons shown?

  • Comparison size (radius in pixels)
  • Proportion of time the comparison is selected (25% vs 75%)
• What is the definition of psychophysics?

  Study of senses and physical stimuli interaction
• How could this pattern be used to illustrate a scientific concept?

  This pattern could be used to illustrate the phases of the moon or the progression of a solar eclipse.
• What are the two types of comparisons shown in the graph?

  • Comparison selected 25% of the time
  • Comparison selected 75% of the time
• What happens when the stimulus magnitude increases beyond $\delta \phi$?


  We perceive a change in sensation
• What is the just noticeable difference (JND)?

  Smallest change in a stimulus detected
• What is the pattern shown in the image?

  The image shows a sequence of yellow circles of increasing size.
• Why is JND important in perception?

  It helps understand sensory thresholds
• How does the arrangement of the circles contribute to the overall meaning of the image?

  The progression in size suggests a cyclical or sequential process
• What question does the JND concept prompt regarding cookies?

  How much bigger must a cookie be?
• What is the difference between the comparison size when selected 25% of the time and 75% of the time?

  • Comparison size when selected 25% of the time: 5 pixels
  • Comparison size when selected 75% of the time: 12 pixels
  • Difference: 12 - 5 = 7 pixels
• How does the size of the triangles relate to JND?

  Each triangle must grow to be noticeable
• How does the spacing between triangles illustrate JND in size perception?

  • Shows relationship between size increase and perception
  • Demonstrates how size changes become noticeable
• What is the Just Noticeable Difference (JND) in size perception?

  The smallest amount of size change you can see
• What does the phrase "That cookie grew a little bit!" signify in terms of JND?

  It indicates a detectable size change
• What does psychophysics primarily study?

  How physical stimuli are perceived by senses