SLHS 21500 Lecture Notes - Lecture 1: Psychoacoustics, Computer Keyboard, Psychophysics
25 Aug 2016
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Department
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Professor
ā¢ Psychoacoustics:
ā¢ behavioral measurement of perception
ā¢ psycho: perception
ā¢ acoustics: sound
ā¢ psychophysics: more general
ā¢ How to do psychoacoustic research?
ā¢ have to have a question
ā¢ have to know acoustics
ā¢ have to know techniques to measure perception
ā¢ have to know auditory physiology
ā¢ may have to do quantitative (computer) modeling
ā¢ Question comes from Physiology
ā¢ background:
ā¢ Sensory Systems Adapts:
ā¢ touch
ā¢ taste
ā¢ smell
ā¢ vision: pupillary reļ¬ex
ā¢ feedback loop
ā¢ adjusts the dynamic range (range in which you can detect
changes)
ā¢ Humans have to communicate in background noise
ā¢ mating pressure
ā¢ food pressure
ā¢ predators
ā¢ The auditory system adapts too
ā¢ The auditory system has a feedback loop
ā¢ activating the feedback loop turns down the ampliļ¬cation by the
OHCs, this is called the medial olivocochlear reļ¬ex (MOCR)
ā¢ What is the MOCR (feedback loop) doing perceptually?
ā¢ some evidence from animals that the MOCR may help detection in
background noise
ā¢Lab
ā¢ there are numerous effects in audition that could be consistent with activation
of MOCR
ā¢ one of these is overshoot or the temporal effect
ā¢ behaviorally it is easier to hear a signal in competing sound if the competing
sound has been on for a while
ā¢ Where to start?
ā¢ read literature from physiology
ā¢ read literature from psychoacoustics
ā¢ go to scientiļ¬c meetings and keep up with the current research
ā¢ see something that may be connected and ļ¬gure out an experiment
and try to put it together
ā¢ Approach:
ā¢ donāt have a way to know for sure if MOCR is activated
ā¢ the MOCR should decrease ampliļ¬cation
ā¢ see if the auditory system behaves as if the ampliļ¬cation has been
decreased after the sound is presented
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