Example Questions for Exam II.

OK, let's see the correct answers.

CD202, R. Lutfi		Exam I. Physical Acoustics			10/31/95

1.) The function of the stapedial muscle and the tensor tympani is

	a. To enhance spectral contrasts

	b. To protect the inner ear from damage due to high intensity sound.

	c. To provide directionally-dependent filtering.

	d. None of the above


2.) Efferent nerve fibers carry information

	a. from the ear to the brain

	b. from the brain to the ear

	c. both a and b above

	d. none of the above


3. ) Which of the following structures is part of the inner ear?

	a. the inner and outer hair cells

	b. the organ of Corti

	c. the basilar membrane

	d. all of the above


4.)  If a driving force is applied to the apex of the cochlea a traveling wave
is created

	a. along the basilar membrane traveling from base to apex

	b. along the basilar membrane traveling from apex to base

	c. along the tectorial membrane traveling up and down

	d. across the entire length of the cochlea


5.) The effective stimulus (input) for a primary auditory nerve fiber is

	a. an all of none spike response

	b. a mechanical shearing created by the tectorial membrane

	c. a graded synaptic potential

	d. none of the above


6.) Which of the following structures functions as a directionally-dependent
filter?

	a. The ossicular chain

	b. The pinnae

	c. The inner ear. 

	d. None of the above.


7.) Even at the level of the hair cell there is both convergence and divergence
of inputs.  This means

	a. many afferent fibers synapse on a single hair cell

	b. a single afferent fiber synapses on many hair cells

	c. there is a one-to-one correspondence of hair cell and nerve fiber

	d. both a and b above



8.) Low frequency sounds cause vibration of the basilar membrane

	a. near the base where the membrane is the stiffest.

	b. near the apex where the membrane is most compliant.

	c. across most of the length of the membrane

	d. could be any of the above


9.) What evidence suggests a place code for frequency analysis?

	a. Iso-rate functions indicate that nerve fibers have 'best' frequencies.

	b. The central auditory system is tonotopically organized.

	c. Nerve spikes are synchronized to epochs of the time waveform.

	d. a and b above.


10.) Which of the following is a feature of the central auditory nervous
system

	a. Lateral inhibition

	b. Cross-correlation

	c. Plasticity

	d. All of the above


11.) Which of the following is true of effernt nerve fibers?

	a. about 80% synapse on the outer hair cells

	b. there are two types, inner spiral and tunnel radial

	c. they may serve to regulate the response of the inner ear to sound

	d. all of the above are true


12.) Which of the following is most likely to create permanent loss of
hearing?

	a. use of earplugs

	b. exposure to brief intense sounds

	c. exposure to intense sounds over long periods of time

	d. exposure to high frequency sound