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| The line between what we can and cannot hear |
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| The lowest SPL needed to detect the sound |
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| Minimum audible field, pressure is measured when the listener is absent |
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| Minimum audible pressure, the pressure right against the ear drum using headphones |
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| Differences found in MAP and MAF is a matter of... |
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| 6-cc coupler, the volume of the ear canal |
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| 2-cc coupler, ear simulator |
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| Why MAF is lower than MAP |
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| When the listener is present, the sound pressure at the ear drum will be boosted from resonance, HRTF, etc. |
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| The lower the sensitivity |
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| High Spontaneous Firing Rates |
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| Low Spontaneous Firing Rates |
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| Intermediate Firing Rates |
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| Related to the behavioral threshold as the BT is not using passive neurons to do the detection |
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| Rely on the most sensitive neurons for the detection |
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| Corresponds to hearing loss, this is our threshold |
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| Sound level expressed with reference tot he standard threshold curve |
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| Sensory Neuro Hearing Loss |
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| Ranges from 60 dB at 125 Hz to 30 dB at 8000 Hz |
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| 120-130 dB SPL, the longer the duration, threshold begins to decrease |
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| Pain threshold minus absolute (Hearing) threshold |
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| A reference, for every increase of ten fold in duration, there will be a 10 dB decrease in threshold. Only continues for 250 msec. |
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| Trade t he signal power for duration, if you decrease one, you can increase the other. Otherwise known as time-intensity trade |
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| Listener controls the stimulus and adjusts it until a response criterion is met |
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| Experimenter controls stimulus and reverses direction of variable when listener changes judgement |
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| Method of Constant Stimuli |
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| Experimenter preselects several stimuli and present them in random order for a listener response. Also called Psychometric function, threshold is defined as 50% |
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| Head shadows contribute this difference in what we hear |
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| Occur for sounds that have short wavelengths |
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| What we will hear from the opposite ear when we have headphones on |
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| This region is most sensitive for frequncies, which creates the bowled curve to the MAF and MAP frequency curve |
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| Scientific study of human perception of sensory stimuli, how a stimulu leads to a change in perception |
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| First text on psychophysics, JND corresponds to a constant difference in the internal variable |
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| Easier to detech from the standard stimulus than a lower pitch |
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| How many Hz the threshold is above the standard stimulus |
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| We are not very accurate at being able to discriminate between intensities |
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| Our threshold gets better if we... |
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| Measures the gap between the duration of two tones |
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| Amplitude modulation is a key property of speech stimuli, we are sensitive to slow modulation. |
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| Interference of signal detection by the presence of another sound, measured by the amount of threshold shift caused by the masker |
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| Threshold moves up, or becomes elevated |
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| Masked Threshold minus the absolute threshold |
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| The activity of the neurons that responded to the signal is now overwhelmed by the masker |
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| The masker reduces the response of the neuron to the signal to the spontaneous level |
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| Indicates loss in OHCs and sensitivity loss |
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| Source for the nonlinearity of the inner ear |
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| Prevents the potential off-frequency listening in measuring the filter shape, can measure the auditory filter within |
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| 10% of the center frequency. Measure of the bandwidth of a filter. |
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