Intro/Frequency Selectivity
what is this participant's percentage correct?
hits: 60%
misses: 40%
false alarms: 20%
correct rejections: 80%
70%
what is the unit we use to quantify equal loudness contours?
phon scale
what determines the pitch we perceive in complex signals?
the fundamental frequency
what are the three main cues we use to localize sounds?
ITDs, ILDs, and spectral cues
what methods do we use to estimate the width of our auditory filters?
psychoacoustic tuning curves and notched noise method
a sound that is 70 phons is how many sones louder than a sound that is 40 phons?
8 sones
true or false: temporal theory and place theory together fully explain how we process pitch
false, we know the CANS plays a role because when we play dichotic stimuli we experience a different sound
spectral cues are helpful for localization in what plane?
vertical
in terms of frequency, what makes a masker most effective?
when the masker is similar in frequency to the target tone
what is the name of the concept that describes our brain summing loudness up until a certain duration
temporal integration
**BONUS 100 points: what is the cut off duration?**
what are harmonics?
multiples of the fundamental frequency
using ITDs for localization is best for what frequencies? what about ILDs?
ITDs are best for low frequencies and ILDs are best for high frequencies
3 interval 2 alternative forced choice
fill in the blank: when the bandwidth of a sound increases, there is no increase in loudness if it is within the _________
critical band
beyond the critical band, we experience an increase in loudness
what are some limitations of place theory?
even when harmonics are present we only hear one pitch
the same place of stimulation can evoke different pitch perceptions (like when we modulate the amplitude of a signal)
what concept describes the phenomena that masking has less of an effect if it is in a different physical spot than our signal?
spatial release from masking
when creating a psychoacoustic tuning curve, what variable changes? what stays the same?
the frequency and level of your tone stays the same, while the masker frequency and level changes
what is loudness recruitment?
when the loss of OHCs results in a decreased dynamic range, but high level sounds still sound high in level so there is a rapid increase in loudness
frequency selectivity is worse due to imprecise phase locking and broader auditory filters leading to poor pitch perception
how is lateralization different than localization
lateralization is "within your head" between ears, while localization is in the environment around you