NCED Advanced Diagnostics & Troubleshooting 2 — Questions and Answers
Question 1: A student scores significantly higher on a test of reading fluency than on a test of reading comprehension. Which diagnostic hypothesis best explains this pattern?
- Phonological processing deficit
- Hyperlexia or language comprehension deficit (Correct answer)
- Visual processing disorder
- Working memory impairment only
Correct answer: Hyperlexia or language comprehension deficit
Strong decoding with weak comprehension is characteristic of hyperlexia or a language comprehension disorder, where word recognition is intact but meaning extraction is impaired.
Question 2: When interpreting a Cattell-Horn-Carroll (CHC) profile, a diagnostician notices low scores in Gs (processing speed) and Gsm (short-term memory) with average scores in Gf and Gc. This pattern most likely impacts:
- Abstract reasoning and vocabulary acquisition
- Timed tasks and multi-step instruction following (Correct answer)
- Long-term retrieval and visual-spatial reasoning
- Reading decoding and phonological awareness
Correct answer: Timed tasks and multi-step instruction following
Deficits in processing speed (Gs) and short-term memory (Gsm) directly affect performance on timed tasks and the ability to hold and execute multi-step instructions.
Question 3: A diagnostician is evaluating a student who shows scatter across subtests of a cognitive battery with no clear pattern. The most appropriate next step is to:
- Conclude the test is invalid and re-administer in one week
- Examine behavioral observations and consider supplemental testing to clarify the profile (Correct answer)
- Average all scores and report a single composite
- Diagnose intellectual disability based on subtest variability
Correct answer: Examine behavioral observations and consider supplemental testing to clarify the profile
Subtest scatter warrants careful clinical interpretation, review of behavioral observations, and supplemental assessment rather than averaging or premature diagnosis.
Question 4: Which error analysis technique is most useful for distinguishing a phonological deficit from an orthographic deficit in a student with poor spelling?
- Counting total number of misspelled words
- Analyzing whether errors are phonetically plausible or violate sound-symbol correspondence (Correct answer)
- Comparing spelling to reading fluency scores only
- Administering a vocabulary test
Correct answer: Analyzing whether errors are phonetically plausible or violate sound-symbol correspondence
Phonetically plausible errors (e.g., 'bote' for 'boat') suggest orthographic knowledge gaps, while phonologically implausible errors point to phonological processing deficits.
Question 5: A bilingual student's scores on a norm-referenced English language test fall in the below-average range. The MOST critical step before interpreting this as a learning disability is to:
- Re-administer the test in six months
- Evaluate language proficiency and performance in the student's primary language (Correct answer)
- Compare scores to the full standardization sample only
- Recommend ESL services immediately without further testing
Correct answer: Evaluate language proficiency and performance in the student's primary language
Determining whether low scores reflect limited English proficiency versus an intrinsic processing disorder requires assessing skills in the student's dominant language.
Question 6: During a reading diagnostic, a student correctly reads nonsense words but struggles with irregular sight words. This pattern most strongly suggests a deficit in:
- Phonological decoding
- Orthographic memory/lexical storage (Correct answer)
- Rapid automatized naming
- Phonemic awareness
Correct answer: Orthographic memory/lexical storage
Intact nonsense word reading indicates phonological decoding is functional, while difficulty with irregular sight words points to a weakness in orthographic memory or lexical storage.
Question 7: A diagnostician suspects test anxiety is inflating a student's low scores. Which approach provides the BEST evidence to evaluate this hypothesis?
- Discard all scores below the 25th percentile
- Compare performance on low-stakes informal tasks to standardized scores and review behavioral observations (Correct answer)
- Administer only non-verbal tests
- Request a physician's note about anxiety
Correct answer: Compare performance on low-stakes informal tasks to standardized scores and review behavioral observations
Comparing informal, low-stakes performance to standardized results while documenting behavioral observations helps isolate the role of anxiety from genuine cognitive deficits.
NCED Advanced Diagnostics & Troubleshooting 2
A student scores significantly higher on a test of reading fluency than on a test of reading comprehension.
Which diagnostic hypothesis best explains this pattern?