Neurologic objective, noninvasive test of auditory brainstem function in response to auditory (click) stimuli. It’s a set of seven positive waves recorded during the first 10 milli seconds after a click stimuli. They are labeled as I - VII. Also called Jewet bumps.

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12. SPIRAL
GANGLION
COCHLEAR
NUCLEI
SUP OLIVARY
COMPLEX
LATERAL
LEMINISCUS
INFERIOR
COLLICULUS
MEDIAL
GENICULATE
BODY
AUDITORY
CORTEX
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13. Processing at different levels
Generates electrical activity
Monitored by surface electrode
Graphic recording presents a waveform with discrete peaks
Depends on the functional integrity of the pathway
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18. Click sounds –
stimulates basal part
earlier than apex
Velocity of travelling
wave higher in the
basal part.
BM at base is more taut
& narrow.
Strong neural
synchrony at the basal
part (high frequency
part)
Larger
component of
BERA response.
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32. P3
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41. Wave Site of Neural Generator
I Cochlear nerve (distal end)
II Cochlear nerve ( proximal end)
III Cochlear nucleus
IV Superior Olivary Complex
V Lateral Leminiscus & Inferior
Colliculus
VI & VII Not definitely known
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43. 1 2 3 4 5 6 7 1 2 3 4 5 6 7
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45. 1 2 3 4 5 6 7 1 2 3 4 5 6 7
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47. 1 2 3 4 5 6 7 1 2 3 4 5 6 7
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48. 1 2 3 4 5 6 7
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56. Below 2.2 millisec
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73. Parameter measured Normal value (ms) Criteria for
abnormality (ms)
I to III IPL 2 More than 2.4
III to V IPL 2 More than 2.4
I to V IPL 4 More than 4.4
Interaural difference
of wave V
Less than 0.3 More than 0.3
Morphology of wave V Present Absent
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123. Large AN arising
from I/L 8th nerve
compressing
brainstem on C/L
side.
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