Interacoustics PA5 - Auditory Behaviour Index for Infants

PA5 Operation Manual
Page 11
Auditory Behaviour Index for Infants
Age
Reaction on
noisemaker
(approx.
dB SPL)
Reaction
on warbled
pure tones
(dB HL)
Reaction
on Speech
(dB HL)
Expected
Response
0–6 weeks
50-70 dB
78 dB (+ 6)
40-60 dB
Eye-widening,
eye-blink, stirring
or arousal from
sleep, startle.
6-16 weeks
50-60 dB
70 dB (+ 10)
40 dB (+ 2)
Eye-widening,
eye-shift, eye
blink, quieting:
beginning
rudimentary
head turn by four
month.
4-7 months
40-50 dB
51 dB (+ 9)
21 dB (+ 8)
Head turn on
lateral plane
towards sound:
listening attitude.
7-9 months
30-40 dB
45 dB (+ 15)
15 dB (+ 7)
Direct
localisation of
sounds to side,
indirectly below
ear level.
9-13 months
25-30 dB
38 dB (+ 8)
8 dB (+ 7)
Direct
localisation of
sounds to side,
directly below
ear level
indirectly above
ear level
13-16 months
25-30 dB
32 dB (+ 10)
5 dB (+ 5)
Direct
localisation of
sounds.
16-21 months
25 dB
25 dB (+ 10)
5 dB (+ 1)
Same.
21-24 months
25 dB
26 dB (+ 10)
5 dB (+ 2)
Same.
Stimulus as
PA5
(From Northern and Downs: Hearing in Children) Copyright © 1974 the
Williams and Wilkins company. By permission of publisher and author).