Corrigendum

This article refers to:

Sound production treatment for acquired apraxia of speech: Effects of blocked and random practice on multisyllabic word production

Wambaugh, J., Nessler, C., Wright, S., Mauszyycki, S., Delong, C. 2015. Sound Production Treatment for Acquired Apraxia of Speech: Effects of Blocked and Random Practice on Multisyllabic Word Production. International Journal of Speech-Language Pathology, 18, 450-464. DOI: 10.3109/17549507.2015.1101161

When the above article was first published online, it contained an error in the analysis of Participant 2’s probe data: one treated item was tallied as a generalisation item and one generalisation item was tallied as a treated item (for the Blocked Phase items). This resulted in incorrect graphing of probe data in Figure 2 and erroneous effect size calculations for Participant 2. The corrections did not result in changes in our interpretation of Participant 2’s results.

This error has now been corrected throughout the article as follows:

Table III. Effect sizes for treatment and follow-up phases: d-Index values.

Practice type phase	P1	P2	P3	P4
Blocked Treatment Phase  Treated Items  Generalisation Items	*6.75 (small)1.35 (negligible)	10.12 (large)2.55 (small)	18.24 (large)0.73 (negligible)	*10.39 (large)4.87 (medium)
Follow-up Phase  Treated Items Generalisation Items	6.75 (small)0.23 (negligible)	6.94 (small)2.55 (negligible)	7.75 (medium)1.87 (negligible)	16.28 (large)1.75 (negligible)
Random Treatment Phase  Treated Items Generalisation Items	cnc (> 50%)1.11 (negligible)	*15.51 (large)1.03 (negligible)	*17.15 (large)0.59 (negligible)	15.11 (large)0.71 (negligible)
Follow-up Phase  Treated Items  Generalisation Items	11.07 (large)1.59 (negligible)	9.5 (medium)1.03 (negligible)	6.94 (small)1.05 (negligible)	9.25 (medium)1.54 (negligible)

*First treatment phase for participant; cnc, could not calculate due to lack of variance.

Bailey et al. (2015) benchmarks for treatment phase: treated items, d = 5.23, small; d = 6.98, medium; d = 9.65, large; generalisation items, d = 2.25, small; d = 3.75, medium; d = 6.66, large.

Bailey et al., (2015) benchmarks for follow-up phase: treated items, d = 5.90, small; d = 7.12, medium; d = 10.19, large; generalisation items, d = 2.59, small; d = 4.23, medium; d = 6.47, large.

short-legendFigure 2.

Participant 2. Effect sizes were greater for items that received SPT-R for treatment and follow-up phases: treatment phase effects = 10.12 (blocked) and 15.51 (random), and follow-up phase effects = 6.94 (blocked) and 9.5 (random).

The authors apologise for this error.