The results of behavioral audiometry can reflect both the state of peripheral hearing and the ability of the auditory center. Therefore, it is considered to be a “true hearing test”, which is more meaningful for predicting the wearing effect of hearing aids.
Behavioral audiometry for different age groups:
It is also possible to select a test method suitable for him according to the individual difference of the tester.
Applicable groups: Applicable to0 ~ 6Infant child
OBJECTIVE: To stimulate infants and young children with sounds to observe the behavioral responses of infants and young children to sound stimulation under unconditioned conditions.
Definition: stimuli appear → observe changes in auditory behavior of infants and young children → assess the hearing status of infants; can only be used as a primary indicator of normal hearing or suspected hearing loss, requiring objective test to confirm the results
Test environment: sound insulation room
Subject Status: Make sure the child stays awake or sleeps less well when testing.3The ideal state of the month is between light sleep&Quiet and awake state
Testers and practices
1.As soon as possible, establish a close relationship with children, attract children, let them pay attention to the toys in front of them, so that they are in a quiet state, but not too invested;
2.Give the tester an opportunity to give a sound;
3.Give children appropriate encouragement;
4.Record relevant information, such as the frequency component of the stimulating sound of the vocal toy and the intensity of the stimulating sound, the side of the sound, the side of the reaction, and accurately describe the situation and reaction mode of the child’s turning movement;
Controls the intensity and frequency of the stimulus, and determines whether the response of the subject is an auditory response. Pay attention to the reaction of the child. If the child does not respond to the stimuli, give it again until the reaction occurs.
Use the high-frequency stimuli and low-frequency stimuli to measure each ear, repeat and randomly use the non-stimulus control method – give four effective stimuli, randomly1This ineffective stimulus was examined as a control.
Finally, the most intensive signal is used to elicit a startle response. This signal may scare the child to cry, and the parents need to explain it before giving the sound.
Test distance: the distance between the sounding toy and the test ear and the sound level meter microphone is equal.30 ~ 45cmAnd at the same level, the sound source is placed behind the ear of the child, ensuring that it is outside the child’s field of vision
Suitable position for children: The best posture is to sit on a high chair and feel comfortable. You can turn your body from one side to the other at will; you can sit on your mother’s lap and the mother gently holds the child’s waist, but the mother should not be right. reaction;
Children under four months can be in a light sleep state.
Parents should not move, don’t give tips
Inducing the observer position: opposite the test subject, guided by a toy
Tester location: behind the parent side, using equipment or toys to make a sound
Stimulating sound selection
Frequency-calibrated sounding toys, portable evaluators, narrowband noise, broadband noise, language (especially familiar sounds)
(Clinical children’s behavioral audiometry commonly used sound toys frequency reference:
The main frequency of the drum is about250 ~ 500Hz, belonging to the low frequency sounding object;
The frequency of the wooden fish is about800 ~ 1000Hz, belonging to the intermediate frequency of the sounding object;
The main frequency of the triangular iron is about6000Hz, belonging to high frequency sounding material)
Be careful to stand next to the size of the sound
Giving time: the duration of the sound is3 ~ 5s, giving the sound interval at least lasting10s
Observe the response of children with stimuli
Pediatric reactions: closed eyes (eyelid reaction) or whole body shaking (MoorReflex), etc. are more common, some babies are suddenly stimulated by sound during sleep.
Head or eyeball turning direction
Open your eyes (awakening reflex)
Stop or make a sound
Temporary deep breath
Sucking reflex (stops sucking or making “ah” sound)
Respiratory rate change
MoorReflection: born0 ~ 3Normal hearing of children50~60dB(A)The sound will be expressed as open eyes, full body shaking, two-handed fists, and forearm flexion and extension.
Record and explain: record the frequency component of the vocal toy stimuli and the intensity of the stimuli, give the sound side, the reaction side, and accurately describe the child’s turning movement and reaction mode;
Behavior observation and listening
Should not be used to: screen hearing; estimate the starting hearing threshold; determine the target value of the hearing aid – this must be obtained through ABR and ASSR; this may assist in interpreting ABR results