The American Academy of Audiology Guidelines for the Diagnosis, Treatment and Management of
Children and Adults with Central Auditory Processing Disorder 2010 state:
“Behavioral test batteries for diagnosis of (C)APD should include both speech and nonspeech (non-verbal) tasks that assess different levels and regions of the CANS and a variety of auditory mechanisms or processes (ASHA, 2005b). These procedures may include, but are not limited to, assessment of the following auditory processes: sound localization and lateralization, auditory discrimination, auditory temporal processing, auditory pattern processing, dichotic listening, auditory performance in competing acoustic signals, and auditory performance with degraded acoustic signals.”
The CRW test is a measure of the ability to cope with degraded signals. The test uses speech materials that have been compressed and reverberated and requires the listener to “fill in” the missing information. This skill is needed for complex listening situations, as with hearing in the presence of background noise.
The FPT is a temporal ordering task that measures the ability to perceive and recognise tonal patterns. This task requires the testee to listen to, identify and name the pattern of three sounds presented to each ear (e.g. high-low-low). Deficits in temporal processing (perception of small changes in sound over time) are manifested by difficulties hearing subtle changes in stress, rhythm and intonation of speech, which may result in problems hearing or spelling similar words or with understanding the intent and subtleties of language. Temporal processing is critical to a wide variety of everyday listening activities.
The DDT test is a test of binaural integration requiring integration of information from both sides of the brain. During this test, two pairs of numbers are presented simultaneously, (one number in each ear) requiring a total of four numbers to be repeated. This test can give an indication of the ability to cope with competing speech information.
The RGDT is a test of temporal resolution that measures the ability to detect brief silent intervals in tonal material. Temporal resolution is necessary to perceive the subtle rapid changes of sounds within words for good speech discrimination.
The DST test is a screening test to evaluate rote, short term memory. The DST requires the client to repeat a pattern of numbers. Short term memory is important for basic language skills such as learning sounds of new words and building vocabulary.
The LISN-S test assesses the ability to understand speech in the presence of noise coming from different directions, or auditory stream segregation. Auditory cues such as the location of the sounds, or pitch of the speakers’ voices, help this process of segregation
| Test Condition
| Low-cue SRT
|| ...when no spatial or vocal cues are available to help the
listener distinguish the speaker’s voice from the distracter story
| Talker Advantage
|| ...to use vocal cues to distinguish the speaker’s sentences from the distracter stories
|Spatial Advantage||...to use differences in the physical location of the target and distracters to perceive the sentences|
|High-cue SRT|| ...when both spatial and vocal cues are available to help the listener distinguish the speaker’s voice from the distracter story voices
| Total Advantage
||...to use cues in the environment to help distinguish one voice from other voices|