meng chaos

• What is the absolute threshold in psychophysics?

  The smallest amount of stimulus energy needed
• What does the relative threshold refer to in psychophysics?

  The just noticeable difference in sensation
• What is the difference limen in psychophysics?

  The amount of change needed for JND
• What must the stimulus in a difference limen test be?

  Presented above absolute threshold
• Can you name an auditory-based detection task?

  Identifying a tone's presence
• Who is considered the founder of psychophysics?

  Gustav Theodor Fechner
• What did Fechner contribute to psychophysics?

  Formalized the concept of a threshold
• What does Weber-Fechner's Law state?

  JND is a constant proportion of stimuli
• How does stimulus intensity affect sensation according to Weber's Law?

  Greater intensity requires greater changes for sensation
• What is the point of subject equality (PSE)?

  Where a variable stimulus is judged equal
• How does the PSE relate to musicians and non-musicians?

  They may judge tones differently
• What is the just noticeable difference (JND)?

  Smallest difference a sensory system can detect
• What does a high precision in JND indicate?

  JND is small
• What does the psychometric function measure?

  Probability of correctly judging a sound
• What happens to the probability of sound detection as sound level increases?

  Probability of correct judgment increases
• What is the threshold in a psychometric function?

  Often the half point on the function
• What does psychophysics study?

  Interaction of physical stimuli with sensory systems
• What is the method of adjustment in psychophysics?

  Participant adjusts stimulus until detected
• What is a key factor in the method of adjustment?

  Starting value should be above or below threshold
• What are the pros of the method of adjustment?

  Quick and easy to understand
• What are the cons of the method of adjustment?

  Potential for participant bias
• How does the method of limits work?

  Tester controls intensity, changes it trial by trial
• What is a key advantage of the method of limits?

  Stimulus duration is under tester's control
• What is a disadvantage of the method of limits?

  Initial trials may not contribute to threshold
• What does the method of constant stimuli involve?

  Randomly presenting stimuli near the threshold
• What is a disadvantage of the method of constant stimuli?

  Time-consuming for threshold determination
• What does the adaptive method in psychophysics do?

  Converges to different probability correct as threshold
• What is the interval in a yes/no response paradigm?

  Where a signal may or may not be present
• What is the N-alternative forced choice paradigm?

  Participants choose which interval contains a signal
• What is a major problem in psychophysics?

  Determining how sensory response grows with stimulus
• What is the pitch discrimination task?

  Judging if pairs of tones are the same
• What does the psychometric function indicate?

  Relationship between stimulus intensity and detection