Reflex Audiometry by Neonates
The reflex pattern elicited by sound can be divided into the following
types of reflexes (Relke and Frey 1966). The sound intensity is 75 –
90dB.
Breathing Reflex
The breathing rhythm is changing when the sound is heard
and should stabilise after 5-10 seconds.
Auropalpebral Reflex (APR)
The open eyelids will be closed fast and clear.
Moving Reflex
The neonatal child will move heavily after a quiet period.
Crying Reflex (Scream)
The face of the child will indicate discomfort and shortly after
followed by weeping or a scream.
Astonishment Reflex
Crying and body movements stop momentarily as if the child is
asking: “What is going on”?
Waking up Reflex
The breathing rate is accelerating; the child starts moving,
wakes up and opens the eyes.
Maturation of Auditory Response
Newborn to 2 months of age
Arousal from sleep. MRL
2
in
quiet surroundings 50-70 dB.
MRL in noisy surroundings: 90
d
2
Minimum response level, dB HL. The MRL levels are recorded in sound cabins. In
noisy surroundings the levels will have to be correspondingly higher.
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