CANS Testing Exam Questions With Verified Answers

CANS Testing Exam Questions With Verified Answers What are the 4 categories of CANS dysfunction tests? - answer1. Dichotic speech tests 2. Binaural interaction tests 3. Temporal ordering tests 4. Monaural low redundancy speech tests On what physiologic premise are dichotic speech tests based? - answerOn the physiologic premise that contralateral pathways are more numerous and robust than ipsilateral pathways Which means that if we use monaural stimulation, the information can be processed equally well by both ipsilateral and contralateral pathways. But in dichotic stimulation situations, the weaker ipsilateral pathways are believed to be suppressed by the stronger contralateral pathways. In dichotic testing, where do we expect the deficit to be if one hemisphere is compromised? - answerat the contra ear Where do we expect the deficit to be if the compromised hemisphere is the person's language- dominant hemisphere? - answerWe may see bilateral deficits or a deficit at the contra ear. What type of lesion are dichotic tests sensitive to? - answerAll dichotic tests are sensitive to cortical lesions, but, generally, they don't tend to be sensitive to brainstem lesions. What are the 5 types of dichotic speech tests? - answer1. Dichotic digits 2. Dichotic CVs 3. Dichotic rhymes 4. Staggered spondaic words 5. Competing sentences Explain how the dichotic digits test works. - answerPresent 4 digits simultaneously (2 to each ear) at 50 dB SL relative to spondee threshold. Patient repeats back all the digits they hear. Derive a % correct for each ear and compare to norms. What are the norms for dichotic digits? - answer11 years old or older: abnormal = 90% at either ear What result would you expect on dichotic digits for a person with a right temporal lobe lesion? - answer90% correct for the left ear Why would you expect a bilateral deficit in a dichotic speech test for patients with left temporal lobe lesions? - answerMost people's left hemisphere is the language-dominant hemisphere, and they have to use language to report their answers. When would a left hemisphere lesion maybe no show a bilateral deficit in dichotic speech tests? - answerIf the lesion is deep within the left hemisphere,a s they tend to affect the corpus callosum. Explain how the dichotic CVs test works. - answerPresent CVs dichotically at 50 dB SL relative to spondee thresholds; can be presented simultaneously or in lead-lag fashion. Patient repeats what they heard. Derive a % correct for each ear and compare to norms. What are the norms for dichotic CVs? - answerAbnormal adult performance = 43% for either ear in simultaneous condition OR 90% for either ear in lead-lag condition Is simultaneous or lead-lag presentation more difficult for dichotic CVs? - answersimulatenous What is lead-lag fashion? - answerWhen you are presenting stimuli dichotically, you introduce one to one ear slightly before the other CV is introduced to the other ear. What are some commonly used CVs in dichotic CVs? - answerba, pa, ta, ka, ga, da Explain how dichotic rhymes works. - answerPresent 30-50 pairs of monosyllabic words that begin with a stop consonant and differ only in the initial consonant (i.e., bat, cat) at 50 dB SL relative to spondee thresholds. Patient repeats what they hear. Derive a % correct for each ear and compare to norms. What are the norms for dichotic rhymes? - answerAbnormal adult performance = 30% for either ear 70% for the right ear 60% fofr the left ear Differences between ears 34% What happens when you present dichotic rhymes in a dichotic fashion? - answerStimuli tend to become fused to the listener, and normal listeners only perceive one word. What ear advantage do normal listeners have for dichotic rhymes, and what does this means? - answerThere's a slight right ear advantage, which means that they tend to hear the word presented to the right ear slightly more often than they do the word that is presented to the left ear. What is dichotic rhymes sensitive to? - answerTend to be sensitive to interhemispheric lesions, like at the corpus callosum or auditory commissure What type effect would an interhemispheric pathway lesion have on a person? - answerThey would have trouble transferring information from one side of the brain to the other. Explain how staggered spondaic words works. - answerPresent 40 pairs of spondee words in an overlapping, staggered fashion, so that the first half of the first word and last half of the second word are in a non-competing condition. Derive a % correct for each ear and compare to norms. What are the norms for SSW? - answerAbnormal adult performance = 90% correct in either ear What does SSW tend to tease out? - answerContralateral ear deficits where the hemisphere that is impacted is lesioned in the temporal lobe, specifically involving the primary auditory areas. Explain how competing sentences test works? - answerPresent 25 pairs of simple sentences (5-7 words long) dichotically, with the target sentence softer (35 dB SL relative to spondee threshold) than the competing sentence (50 dB SL relative to spondee threshold). 5 sentences are for practice, 10 where target sentence is in the right ear, and 10 where target sentence is in the left ear. Patient repeats the target sentence. Derive a % correct for each ear and compare to norms.