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Understanding more on audiograms and sound...
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Hearing Loss Spectrum
| This chart shows the various levels of hearing los |
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| CLICK TO ENLARGE |
This audiogram chart shows the categories of degrees of hearing loss. Each section shows the degrees of hearing loss, starting from the top which is normal hearing to the bottom which is a profound loss. Remember, an audiogram plots and shows the softest sound one can hear at the various frequencies (pitch) and at various loudness levels. It is possible and quite likely that one may fall into more than one category of hearing loss or deafness. Someone may have a mild to moderate loss or a moderate to profound loss depending on where each sound, according to the various loudness and frequency levels, is plotted.
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Sources of Sound/Noise
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SOURCES |
INTENSITY (dB) |
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Whispered Voice |
20-30 |
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Urban Home, Average Office |
40-60 |
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Average Male Conversation |
60-65 |
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Noisy Office, Low Traffic Street |
60-80 |
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Jet Transports (Cabin) |
60-88 |
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Small Single Plane (Cockpit) |
70-90 |
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Public Address (PA) Systems |
90-100 |
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Busy City Street |
80-100 |
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Single Rotor Helicopter (Cockpit) |
80-102 |
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Power Lawn Mower, Chain Saw |
100-110 |
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Snowmobile, Thunder |
110-120 |
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Rock Concert |
115-120 |
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Jet Engine (Proximity) |
130-160 |
This lists common sounds and their level of loudness as recorded in decibels (dB).
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Below lists the behaviors that should be expected at certain ages (Gleason, 1999; Northern & Downs, 1991).
This list is especially helpful when you aren't quite sure what to expect as your child develops. If your infant's hearing was not tested at birth or later, this chart is a useful guide to use as a reference in determining if your child may possibly have a hearing loss. However, the best and most accurate way to really know if your child has a hearing loss is to have an infant hearing screening test conducted on your child.
Expected Auditory Behaviors in Infancy
ONE MONTH
- Responds to sounds, such as a bell
- Listens to familiar words
- Turns head to locate sound
THREE MONTHS
- Turns to voices and may quiet to familiar voices
- Stirs or awakens to a nearby, loud sound
- Coos and babbles
SIX MONTHS
- Responds by turning head to sound or voice
- Engages in vocal play
- Imitates sounds
- Vocalizes for social contact
NINE MONTHS
- Responds differentially to friendly and angry voices
- Imitates speech sounds
- Vocalizes recognition
- Babbling acquires inflection
TWELVE MONTHS
- Listens to familiar words
- Turns head to locate sound
- Responds to own name
- Ceases activity in response to parent's voice
- Stirs or awakens to nearby sound
- Understands a few familiar words and phrases
- Responds to music and singing
- Says one word, such as dada or mama
- Vocalizes emotions
- Imitates sounds and words
- Increases type and amount of babbling, and points while babbling
EIGHTEEN MONTHS
- Comes when called
- Responds to no
- Follows simple commands
- Uses 4 to 10 words other than mama and dada
TWENTY-FOUR MONTHS
- Comprehends simple questions
- Follows directions
- Responds to rhythm of music
- Shows understanding of many phrases
- Plays with objects that make sounds
- Has a vocabulary of 50 words or more
- Combines words
- Uses voice for expressing needs
- Gives first name
- Points to a named body part
- Names a picture or object
- Uses vocal inflection
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| ONE MONTH--Responds to sounds such as a bell |
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| THREE MONTHS: Stirs or awakens to a nearby, loud sound |
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| TWELVE MONTHS: Responds to music |
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| TWENTY-FOUR MONTHS: Plays with objects that make sounds |
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