The Auditory Cortex Discussion Questions

The Auditory Cortex Discussion Questions
Order 59880192
The Auditory Cortex Discussion Questions
his question is about the auditory cortex.
(a) A difference in intensity of a sound at each ear is essential for localizing the
source of a sound in space.
(b) It is impossible to localize a sound in space when one ear is deaf.
(c) A time delay between the arrival of a sound at each ear is one way in which
the direction of a sound can be localized.
(d) Neurones of the auditory relay nuclei in the pons, mid-brain and thalamus
all receive excitatory inputs from both the ipsilateral and contralateral
cochleas.
(e) The auditory cortex is necessary for discrimination of the temporal patterning
of sounds (i.e. tunes).
119 A subject with head tilted nose downward by about 30 degrees with reference
to the normal upright position, is rotated in a chair toward the right, at 30 revs/min
for one minute. The movement of the chair is then stopped. The rotation can
be either with the eyes open (in the light) or with eyes closed (in the dark). The
potential changes recorded between two electrodes placed 1 cm beyond the
lateral edge of each eye are used to record eye movements. The questions relate
to this experiment.
~U-LT
Direction of
J slow drift
1 2
TIME (sec)
Record of nystagmus with eyes open, in the light.
(a) Throughout the rotation with the eyes open you would expect to record
nystagmus with a slow horizontal drift to the right and a fast flick to the left.
(b) At the start of rotation with the eyes shut, you would expect to record
nystagmus, with a slow horizontal drift to the right and a fast flick to the left.
(c) After spinning at a constant angular velocity for about 30 seconds with the
eyes shut, you would no longer expect to record nystagmus.
(d) A subject showing no nystagmus when rotated in the dark could have suf¬
fered damage of the Vlllth nerve.
(e) It is the stimulation of the otolith organs in the labyrinths that would produce
the nystagm
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