SPTH2101 Chap.3 Phonological Patterns and PCC
Phonological Patterns and PCC
Pattern analysis starts by comparing the adult target with the heard child production and describing the feature change. The tutorial materials name weak syllable deletion, final consonant deletion, cluster reduction, velar and palatal fronting, stopping, deaffrication, gliding, voicing, devoicing and assimilation. A single token is an instance; a productive pattern requires recurrence across relevant opportunities.
PCC adds a quantitative summary by dividing correct consonants by all consonant opportunities and multiplying by one hundred. The worksheet also supplies interpretation bands. Those bands describe a defined sample and do not identify which contrasts were lost, why the errors occurred or whether the sample is representative.
This chapter therefore keeps the numerator, denominator, opportunity distribution, language context and intelligibility visible beside the final percentage.
What this chapter covers
- 01
Adult target and child production comparison
- 02
Place, manner and voicing changes
- 03
Recurring phonological patterns across opportunities
- 04
PCC numerator, denominator and recomputation
- 05
Worksheet severity bands and boundary wording
- 06
Error distribution after a percentage is calculated
Worked example · free
Calculate and disaggregate PCC
- +1Verify that forty-two correct plus eighteen incorrect equals sixty opportunities.
- +1Calculate forty-two divided by sixty, multiplied by one hundred, to obtain seventy percent.
- +1Place seventy percent in the worksheet's mild-moderate band.
- +1Inspect final-position targets because most errors occur there.
- +1Keep diagnosis open until pattern, context, language and sample reliability are integrated.
Key terms
- PCC
- Percent consonants correct, computed from correct consonants divided by all consonant opportunities in a defined sample.
- Cluster reduction
- Production of fewer consonants than the adult target contains in a consonant cluster.
- Fronting
- Replacement of a sound produced further back in the mouth with one produced further forward.
- Stopping
- Replacement of a fricative or affricate target with a stop production.
- Assimilation
- Change in one sound that makes it more like another sound within the word.
Phonological Patterns and PCC FAQ
How many examples make a pattern?
The materials do not provide one universal count. Report the number of relevant opportunities and the number showing the change, then sample across words, positions and contexts. One token is an instance. A broader pattern claim needs recurrence and an adequate opportunity set.
Can two children have the same PCC but different profiles?
Yes. One child might show a concentrated loss of final consonants while another shows scattered cluster and substitution errors. Their percentages may match, but contrast loss, intelligibility, consistency, language context and intervention priorities can differ substantially.
What happens at a severity-band boundary?
Use the exact wording printed in the course worksheet and show the unrounded result. The sheet says above 85% for mild, so a value at the boundary should be flagged rather than silently pushed upward. Preserve the calculation for review.
Why can two children with the same PCC need different follow-up?
PCC preserves the proportion of correct consonants, not the distribution or communicative effect of the errors. One sample may show a consistent structural change in frequent words while another contains scattered changes in complex clusters. Compare position, opportunity count, consistency, language expectations, intelligibility and sample format after calculating the percentage.
Those details determine the hypothesis and next elicitation, so the shared score cannot serve as a diagnosis or complete treatment priority.
Exam move
Build a two-column drill with adult targets on the left and child forms on the right. Before naming a process, write the place, manner, voicing or structural change. Then count the relevant opportunities. For PCC practice, always reconstruct correct plus incorrect equals total, calculate the percentage and apply the worksheet band without premature rounding.
Finish every problem by describing the error distribution and the additional sample needed. This prevents the quantitative result from replacing phonological analysis. Sort invented target-production pairs into structural changes, place changes, manner changes, voicing changes and assimilation, then justify every label from the transcription rather than from the spelling of the word.
Add distractors in which a final sound changes voicing but is not deleted, or a fricative changes place but does not become a stop. For each proposed pattern, write the numerator and denominator of relevant opportunities, word positions sampled and whether the change recurs in single words and connected speech.
Compute PCC from raw counts without a calculator first, then reverse-check the result by multiplying the proportion by the total. Apply the tutorial bands exactly as printed and flag an edge value instead of silently repairing ambiguous boundary wording. Construct two cases with equal PCC but different error distributions, and explain why their functional consequences and next assessments differ.
Repeat one calculation after excluding an uncertain transcription and state how that scoring decision changes the result. In a bilingual scenario, verify whether each target belongs to the relevant language and dialect before calling it incorrect. Close every practice response with three layers: the arithmetic result, the dominant error distribution and the observation that would most change the interpretation.
This keeps a transparent summary measure inside the larger phonological analysis.
