Hearing Science 3

What is the perception variable that is corresponding to the stimulus variable of frequency?
a. loudness

Pitch

What does frequency difference limen measure?

Discrimination threshold for pitch

Frequency difference limen is the lowest and pitch discrimination is the best for sounds ...

Lower than 4kHz

What pitch perception mechanism is working for pure tones that are higher than 4kHz?

Rate-place code

What pitch perception mechanism is working for pure tones that are lower than 4kHz?

Phase-Locking

T/F: According to Rate-place code in pitch perception of pure tones, a neuron fires fastest when
the frequency of the sound is equal to the characteristic frequency of the neuron.

True

The lowest component of a complex tone is called what?

Fundamental

In the phenomenon of missing fundamental, what pitch is heard with the complex tone?

The pitch of the fundamental

T/F: Pitch of complex tones is perceived by the mechanisms of phase locking to the wave of lower
harmonics and to the envelope of higher harmonics.

True

The ability to hear out one component in a complex sound depends on the listener's ....

Frequency Resolution
Frequency Selectivity
Auditory Filter Width

A bandpass filter _____ sounds have frequency close to the center frequency of the filter and
within the passband, and _____ sounds have frequency that is outside of and passband and is
further away from the center frequency of the filter.

Passes, blocks

The physiology mechanism of auditory filter is based on

Basilar membrane's tonotopic mapping

Basilar membrane' tonotopic mapping means: each location on the basilar membrane
responds to a limited range of ________

Frequency

If someone has wider auditory filters, their frequency resolution is _______, and they tend to
have _____ difficulty with hearing speech in noise.

poorer, more

One of the reasons for those who are older and/or have hearing loss to have more difficulty
with speech understanding in background noise is _________

They have wider auditory filter

Frequency resolution is the ability to separate one sound from complex sounds with multiple
________. Temporal resolution is the ability to separate one sound from another in _______.

Frequency, time

If we change the duration of a pure tone of 1k Hz from 500ms to 1 second, it will
sound__________

No change in loudness but longer in duration

T/F: If your absolute threshold for a 500-ms 1kHz tone is 10dB SPL, you can detect a 100-ms 1kHz
tone played at 10dB SPL.

False

According to the results from Small, Brandt and Cox (1962), which of the following
statements is true about audibility and duration? (Look at study guide for picture)

Cannot be determined, depending on the original duration of the sound

In signals shorter than 200 ms, as duration _____, absolute threshold ______.

Decreases, increases

In signals longer than 300 ms, what is the relationship between duration and absolute
threshold?

No relationship

The masking effect when the signal is presented before the masker is called
________________.

Backward masking

The duration window is approximately 200 ms for forward masking and 25 ms for backward
masking. Which of these signals is not masked by the noise?

Played 100 ms before onset of noise maker

T/F: One consequence of poor temporal resolution is more forward masking in speech
perception, this happens when soft consonant is before louder vowel and masked by the vowel

False

According to the data from the gap detection test, our auditory system can detect
amplitude change (i.e., small gap in noise) in the scale of ________

2-4ms

In amplitude modulation detection, what result indicates better performance?

Listener can detect shallower modulation

In Temporal Modulation Transfer Function, which statement is correct about the
relationship between modulation threshold (in depth) and modulation rate?

Shallow Modulation can be detected when modulation rate is slow

Deep Modulation can be detected when modulation rate is fast

Shallow Modulation cannot be detected when modulation rate is fast