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Late Talkers: Do Good Predictors Oy Outcome Exist?

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Late Talkers: Do Good Predictors Oy Outcome Exist? DEVELOPMENTAL DISABILITIES RESEARCH REVIEWS 17:141-150(2011) LATE TALKERS: DO GOOD PREDICTORS OY OUTCOME EXIST? Leslie Rescorla* Department of Psychology, Bryn Mawr College, Bryn Mawr, Philadelphia Both small-scale and epidemiological longitudinal studies of early Although distinct diagnostic groups within the population language delay indicate that most late talkers attain language scores in the of young children manifesting expressive language delay are easily average range by age 5, 5, or 7. However, late talker groups typically obtain delineated, their relative percentages are less well documented. significantly lower scores than groups with typical language histories on most language measures into adolescence. These findings support a One study that did address this issue was conducted by Busch- dimensional account of language delay, whereby late talkers and typically mann et al. [2008], who studied 100 German 2-year-olds with developing peers differ quantitatively on a hypothetical language ability delayed expressive language identified in pediatric practices. Of spectrum. Variation in language ability is presumed to derive from variation these 100 children (65% boys), 78 were late talkers, 18 had lan- in skills subserving language, such as auditory perception/processing, word guage delay associated with cognitive impairment, and four had retrieval, verbal working memory, motor planning, phonological discrimi- nation, and grammatical rule learning. Expressive language screening at autism. These three groups did not differ in gender, birth posi- 18-35 months can serve an important public health function by identifying tion, or maternal education. Family history of language children whose expressive delay is secondary to autism spectrum disorder, impainnent was reported for 40% of the language-delayed group intellectual disability, hearing impairment, receptive language delay, or de- but for only 4% of a typically developing group. Of the 78 late mographic risk. Finally, the review suggests that demographic risk associ- ated with low SES may become more important as a causal factor in talkers, 61 had an expressive delay only, whereas 17 had recep- language delay as children get older. © 2013 Wiley Periodicals, inc. tive/expressive delay. The late talkers with receptive/expressive Dev Disabil Res Rev 2011; 17:141-150. delay had lower nonverbal IQs than the typically developing chil- dren, whereas the late talkers with expressive delays only did not. For children whose language delay is secondary to ASD or Key words: late talkers, outcomes, predictors ID, developmental progress tends to be slow and language may never reach nonnal levels. Outcomes also vary among late talkers. The purpose of this article is to review the literature on outcomes delay in expressive language is one of the most com- of late talkers with the aim of determining what, if any, variables mon reasons that young children are referred for are reliable predictors of outcome. We wul review two kinds of Aevaluation [Whitehurst and Fischel, 1994; Rescorla studies: (a) small-scale longitudinal studies of late talker and com- and Lee, 2000]. As noted by the US Preventive Services Task parison samples and (b) large-scale epidemiological studies of Force [2006], "Speech and language delay affects 5% to 8% of young children. The review encompasses children identified with preschool children, often persists into the school years, and language delays between 18 and 35 months of age. In the small- may be associated with lowered school performance and psy- scale studies, late talkers are typically a weU-defined group that chosocial problems" (p. 497). excludes children with hearing impairment, neurological disor- Because expressive language delay, like a fever, is a ders, ASD, and ID, and, in some studies, even children with symptom found in many conditions, children who are slow to receptive language delays. In the large-scale epidemiological stud- talk are a heterogeneous group. Expressive language delay is ies, children whose language delay is secondary to a more pdmary often secondary to another disorder [Whitehurst and Fischel, condition may not be excluded or even differentiated. 1994; Rescorla and Lee, 2000]. Late talkers may have a vocal tract malformation or a hearing loss that interferes with lan- OUTCOMES FROM SMALL-SCALE guage development. Other young children with delayed LONGITUDINAL STUDIES OF LATE TALKERS language may have a neurological disorder or general intellec- tual disability (ID). StiU other children who are slow to talk Preschool Outcome Studies of Late Talkers have autism spectrum disorder (ASD), in which case delayed In one of the first studies of late talkers, Fischel et al. [1989] language is accompanied by deficits in social relatedness, play, reported on 22 children identified with specific expressive and behavior. Children may also be slow to talk because they experience severe deprivation, neglect, or abuse. We hence- forth use the term late talkers to refer to children 18- to 35- *Correspondence to: Leslie Rescorla, Bryn Mawr College, 101 N. Merion Avenue, month-old who are slow to talk in the absence of any of these Bryn Mawr, PA 19010. E-mail: [email protected] other conditions presumed to be primary. Some late talkers Received 11 SepteEiiber 2012; Accepted 5 October 2012 have an expressive delay only, whereas others are delayed in View this article online in Wiley Online Library (wileyonlinelibrary.com) receptive language as well. DOI: 10.1002/ddrr.1108 © 2013 Wiley Periodicals, inc. language delay at 24-38 months. The late measures but not on receptive language children who scored >20th percendle. talkers scored more than two standard measures. A subsample of 34 late talkers Mean vocabulary scores were vastly dif- deviadons (SDs) below average on the (20 DR and 14 NDR) was idendfied ferent between the two groups at 18 Expressive One-Word Picture Vocabu- based on scores 1 SD below the mean on months (20 vs. 121 words, d = 1.9), lary Test [EOPVT; Gardner, 1981] and age 2 expressive language. By 42 months, and sdU very different by 30 months had mean vocabulades of <20 words. only the DR late talkers were sdU (419 vs. 569 words, d = 1.0). By 30 Five months later, 35% of the group had delayed in expressive and recepdve lan- months, 14 of the 36 late taUcers still scores in the average range on the guage. For the full sample of 200 scored <20th percentile on the CDI EOPVT (>85), with outcome predicted children, parental educadon and history (39% = delayed), whereas 22 scored by vocabulary size and proportion of con- of dyslexia, symbolic play and vocabulary above this cutoff (61% = late bloomers). sonants to vowels at intake. By age ^'^/z, comprehension at 14 months, expressive Of the 18 children delayed at 30 88% scored above 85 on the EOPVT; language at 24 months, and receptive months, 14 had been late talkers at 18 95% were in this range by 5'/2 [White- language at 30 months were all signifi- months and four had been typicaUy hurst etaL, 1992]. cant predicton of expressive language developing (9% of the typical group Thai et al. [1991] reported that outcome at age y/2 years, explaining were delayed at 30 months). These out- four of 10 late talkers idendfied at age 2 48% of the total vadance. comes yielded sensidvity of 78%, who were still delayed 1 year later (i.e., Rescoda et al. [2000] reported specificity of 66%, positive predictive the "truly delayed") had also been age 3 and age 4 outcomes for 34 late value of 39%, and negadve predictive delayed at age 2 in recepdve language talkers with normal receptive language value of 88%. and recognitory gestures. In contrast, the and nonverbal ability idendfied at 24— Femald and Marchman [2012] six "late bloomers" had been comparable 31 months. At age 3, 41% of the late reported that 18-month-old late talken to typically developing compadson chil- talkers scored above the 10th percentile had lower accuracy and speed scores than dren in receptive language and had made on MLU and 34% scored above the typicaUy developing children on looking- extensive use of gestures to compensate 10th percentile on the Index of Pro- while-listening (LWL), an online prefer- for communication. For a different ducdve Syntax [IPSyn; Scarborough, endal looking lexical processing task in sample. Thai et al. [2005] reported 1990]. At age 4, the percentages were the child listens to sentences such as age 4 outcomes of 20 children who 71 ahd 29%. For the same 34 late talk- "where is the doggy?" while a picture of scored <10th percentile in expressive ers, Rescoda et al. [1997] reported that the named referent and a foil are flashed vocabulary on the Communicative the percentage scodng in the normal on a screen. Faster reacdon dme and Development Inventory [CDI; Fenson range at age 3 (>16th percentile) was greater accuracy predicted steeper accel- et al., 1993] at 16 months. Although the 79% on the EOPVT, 58% on the Rey- eradon in vocabulary growth in the late late talker group scored in the normal nell Expressive Language Scale talker group from 18 to 30 months. range on language and cognitive tests, [ReyneU, 1977], 35% on MLU, and Adding reacdon dme as a predictor they scored significandy lower than a 24% on the IPSyn. Thus, granimadcal increased posidve predicdve value to group of 44 compadson children with skills showed the most persistent delays. 55% versus 39% using CDI score alone. typical language (TL) histodes. The late Rescoda et al. [2000] used regres- Vocabulary plus accuracy yielded a posi- talkers also scored lower than the com- sion analyses to identify significant dve predicdve value of 52%. Femald and padson children on a nonword repetition predictors of outcome. Expressive z- Marchman [2012] also noted that March- task, particularly for longer sdmuH. score accounted for 21-34% of the var- man and Femald [2008] had reported Feldman et al.
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