meng 1

• What are physical dimensions in psychophysics?

  Measurable characteristics of physical stimuli
• How is frequency measured in psychophysics?

  In hertz (Hz)
• What is the measurement unit for frequency?

  Hertz (Hz)
• Why are physical dimensions important in psychophysics?

  • They relate to perceptual experiences
  • They provide a basis for objective measurement
• How is the intensity of radiation related to the wavelength for the hottest star?

  Intensity peaks at shorter wavelengths
• What are the three fundamental properties of physical stimuli?

  Frequency, intensity, and wavelength
• How is intensity measured in psychophysics?

  In decibels (dB)
• What is the title of the image?

  Magnitude estimation
• How does the temperature of a star relate to the peak wavelength of its emitted radiation, as depicted in the image?

  Higher temperature, shorter peak wavelength
• What does intensity refer to in psychophysics?

  Amount of energy in a stimulus
• What does wavelength indicate in psychophysics?

  Distance between peaks in a wave
• Which star, based on the image, emits radiation at a wavelength between the hottest star and the coolest star?

  The sun
• What is the measurement unit for wavelength?

  Meters (m)
• What does the graph illustrate about wavelength and electromagnetic radiation?

  It shows how wavelength affects type and intensity
• How do physical dimensions influence perceptual dimensions?

  They directly influence pitch, loudness, and color
• How is wavelength measured in psychophysics?

  In nanometers (nm)
• How is loudness defined in perceptual dimensions?

  Perceived intensity of a sound
• What is the stimulus for loudness?

  Sound waves measured in decibels
• How do the three stimulus attributes relate to the stimulus intensity?

  • As stimulus intensity increases, brightness, apparent length, and estimated length also increase.
  • The relationships are nonlinear, with the curves showing the specific functional forms.
• How do frequency, intensity, and wavelength relate to physical stimuli?

  • Frequency: Measured in Hertz (Hz), affects pitch
  • Intensity: Measured in Decibels (dB), affects loudness
  • Wavelength: Measured in meters (m), affects color
• Which type of star emits radiation at the lowest intensity across the wavelengths shown in the image?

  The coolest star
• How is pitch defined in perceptual dimensions?

  Highness or lowness of a sound
• What is the purpose of magnitude estimation according to the image?

  To have subjects rate some aspect of a stimulus on a scale (e.g., 1-10)
• What perceptual dimension corresponds to wavelength?

  Color
• How does wavelength determine electromagnetic radiation?

  It affects the type and intensity at frequency
• What are perceptual dimensions?

  Subjective aspects of sensory experiences
• How is brightness defined in perceptual dimensions?

  Perceived intensity of light
• What is the measurement unit for intensity?

  Decibels (dB)
• What perceptual effect is associated with frequency?

  Pitch
• Why can't perceptual dimensions be directly measured by instruments?

  They are subjective and require personal ratings
• What are perceptual dimensions in psychophysics?

  Subjective characteristics of sensory experience
• What is the relationship between physical and perceptual dimensions in psychophysics?

  • Physical dimensions: frequency, intensity, wavelength
  • Perceptual dimensions: pitch, loudness, color
  • As physical dimensions increase, perceptual dimensions increase
• If a subject rates a stimulus as a 7 on a brightness scale, what would the corresponding stimulus intensity be according to the graph?

  Approximately 60
• What perceptual effect is associated with wavelength?

  Color
• What perceptual dimension corresponds to intensity?

  Loudness
• How are perceptual dimensions estimated?

  Through subjective scaling methods
• What is the stimulus for brightness?

  Light waves measured in candelas
• How do the curves for apparent length and estimated length differ in their relationship to stimulus intensity?

  The curve for apparent length is steeper than the curve for estimated length
• Why are perceptual dimensions considered subjective?

  They can vary among individuals
• What perceptual dimension corresponds to frequency?

  Pitch