Midterm Psychophysics Flashcards
Psychoacoustics
Perception of a physical characteristic of sound
Method of limits
Tester controls the stimulus
Start above or below the suspected threshold
Based on response inc or dec stimulus
Method of adjustments
Subject has control of the stimulus
Bekesy Audiometry- hold button down when hear stimulus & let go when they don’t
Method of constant stimuli
Test many trials in random order
Masking
The process by which the threshold of one signal is altered by the presence of another signal
Monotic
Stimulus going to one ear
Diotic
The same stimulus to both ears
Dichotic
Both ears being stimulated by different signals
What type of masker will mask a HF
LF
What type of masker will not mask a LF
HF
Critical band
Point at which you can’t mask anymore
Psychophysics
Deals with how we perceive stimuli that affects the senses
Experiments are set up to narrow down options to answer questions by using…
No open ended questions
Specific stimuli & responses
Only one aspect of stimulus is manipulated
Subject responds in predetermined fashion
What 2 things are experiments looking for
Absolute limen
Difference limen
Experimenters must distinguish between
What is heard-sensory capabilities
How responses are made- response proclivity
Auditory sensitivity
Amount if sound pressure required for a “normal” person to just detect the presence of a stimulus
Who created the audibility curve
Sivian & whit 1993
Minimum audible pressure
Obtain 0
Measure pressure at drum
Minimum audible field
Obtain 0 in soundfield
Measure pressure at drum
Missing 6 dB
MAF is more sensitive than MAP by 6 dB
- covering canal for MAP traps LF body sounds
- Pinna and EAC amplifies between 1.6 and 6kHZ with a peak around 3kHz
- 2 ears working together inc sensitivity
Upper level of audibility
Intensities in which there are feelings of vibration or pain
Tullio
Inc in pressure start pushing on vestibules causing dizziness
Terminal threshold
Generally around 130-140 dBSPL
Results of Reisz 1928 jnd study
LF jnd= 1-2 dB
HF jnd= 0.1 dB
