Peter A. de Villiers

A cross-sectional study of the acquisition of grammatical morphemes in child speech.

Speech samples were taken from 21 children aged 16–40 months covering a wide range of mean utterance length. Presence or absence of 14 grammatical morphemes in linguistic and nonlinguistic obligatory contexts was scored. Order of acquisition of the morphemes was determined using two different criteria. The rank-orderings obtained correlated very highly with a previously determined order of acquisition for three children studied longitudinally. Age did not add to the predictiveness of mean length of utterance alone for grammatical development in terms of which morphemes were correctly used. The approximately invariant order of acquisition for the fourteen morphemes is discussed in terms of three possible determinants of this order. Frequency of use in parental speech showed no correlation with order of acquisition, but grammatical and semantic complexity both correlated highly with acquisition order.Speech samples were taken from 21 children aged 16-40 months covering a wide range of mean utterance length. Presence or absence of 14 grammatical morphemes in linguistic and nonlinguistic obligatory contexts was scored. Order of acquisition of the morphemes was determined using two different criteria. The rank-orderings obtained correlated very highly with a previously determined order of acquisition for three children studied longitudinally. Age did not add to the predictiveness of mean length of utterance alone for grammatical development in terms of which morphemes were correctly used. The approximately invariant order of acquisition for the fourteen morphemes is discussed in terms of three possible determinants of this order. Frequency of use in parental speech showed no correlation with order of acquisition, but grammatical and semantic complexity both correlated highly with acquisition order.

Development of the use of word order in comprehension

Thirty-three children aged between 19 and 38 months were presented with six reversible active and six reversible passive sentences and were required to act them out. For each child, mean length of utterance was calculated from a sample of spontaneous speech. Mean length of utterance was a more consistent predictor of performance than chronological age. Seven children with a mean length of utterance between 1.0 and 1.5 morphemes per utterance were unable to use the word order information in either type of sentence for comprehension. More developed children could comprehend reversible active sentences but not reversible passives. Children with a mean length of utterance between 3.0 and 3.5 morphemes per utterance systematically reversed the meaning of the reversible passives. The results are discussed in relation to previous studies of word order comprehension and studies of word order in production.Thirty-three children aged between 19 and 38 months were presented with six reversible active and six reversible passive sentences and were required to act them out. For each child, mean length of utterance was calculated from a sample of spontaneous speech. Mean length of utterance was a more consistent predictor of performance than chronological age. Seven children with a mean length of utterance between 1.0 and 1.5 morphemes per utterance were unable to use the word order information in either type of sentence for comprehension. More developed children could comprehend reversible active sentences but not reversible passives. Children with a mean length of utterance between 3.0 and 3.5 morphemes per utterance systematically reversed the meaning of the reversible passives. The results are discussed in relation to previous studies of word order comprehension and studies of word order in production.

Fish as a Natural Category for People and Pigeons1

Publisher Summary This chapter describes and compares the result of three experiments, one on human subjects and the other on pigeons, and draws conclusions about categorization in light of the results. The chapter establishes rankings of the photographs for human subjects, using reaction time to quantify the discriminability or acceptability of the fish or non-fish in a collection of 35-mm slides. Twelve human subjects responded to 160 underwater photographs to indicate whether they saw a fish or not. Four pigeons rapidly learned to sort underwater photographs being seen for the first time according to the presence or absence of fish in them. For a quasi-concept, a set of instances sorted according to the presence or absence of fish divided randomly, with as many fish in the negative class as in the positive. Pigeons learned to sort 80 stimuli into two categories. They learned quicker when the categories corresponded to fish versus non-fish than when the same stimuli divided into two arbitrary categories. Seven out of seven pigeons in two experiments learned to sort underwater photographs on the basis of the presence or absence of fish.

Early judgments of semantic and syntactic acceptability by children.

Judgments of the acceptability of correct, word order reversed, and semantically anomalous sentences were elicited from 2- and 3-year-old children in a game played with hand puppets. All of the sentences used were simple imperatives and each child was asked to correct those he called wrong. Performance on the judgment task was correlated with each childs mean length of utterance and with his comprehension of reversible active and passive sentences. Only the linguistically most advanced children were able to make a significant number of appropriate judgments and corrections of reversed word order imperatives. Less developed children could appropriately judge and correct semantically anomalous but not incorrect word order imperatives. The importance of semantic as opposed to syntactic factors in childrens judgments of the acceptability of sentences is stressed.Judgments of the acceptability of correct, word order reversed, and semantically anomalous sentences were elicited from 2- and 3-year-old children in a game played with hand puppets. All of the sentences used were simple imperatives and each child was asked to correct those he called “wrong”. Performance on the judgment task was correlated with each childs mean length of utterance and with his comprehension of reversible active and passive sentences. Only the linguistically most advanced children were able to make a significant number of appropriate judgments and corrections of reversed word order imperatives. Less developed children could appropriately judge and correct semantically anomalous but not incorrect word order imperatives. The importance of semantic as opposed to syntactic factors in childrens judgments of the acceptability of sentences is stressed.

On this, that, and the other: Nonegocentrism in very young children

Abstract The development of comprehension and production of spatial deictic terms “this/that”, “here/there”, “my/your”, and “in front of/behind” was investigated in the context of a hide-and-seek game. The first three contrasts are produced according to the speakers perspective, so comprehension requires a nonegocentric viewpoint. The contrast “in front of/behind” is produced relative to the hearer, i.e., production is nonegocentric. The subjects were 39 children, rangin in age from 2.5–4.5 years, and 18 college undergraduates. The 2.5-year-old children were best at those contrasts which do not require a shift in perspective. The 3- and 4-year-old children were adept at switching to the speakers perspective for comprehension of the terms requiring this shift, i.e., were nonegocentric. Four-year-olds were also capable of nonegocentric production of “in front of/behind”.

Enhancing Early Child Care Quality and Learning for Toddlers at Risk: The Responsive Early Childhood Program.

Despite reports of positive effects of high-quality child care, few experimental studies have examined the process of improving low-quality center-based care for toddler-age children. In this article, we report intervention effects on child care teachers behaviors and childrens social, emotional, behavioral, early literacy, language, and math outcomes as well as the teacher-child relationship. The intervention targeted the use of a set of responsive teacher practices, derived from attachment and sociocultural theories, and a comprehensive curriculum. Sixty-five childcare classrooms serving low-income 2- and 3-year-old children were randomized into 3 conditions: business-as-usual control, Responsive Early Childhood Curriculum (RECC), and RECC plus explicit social-emotional classroom activities (RECC+). Classroom observations showed greater gains for RECC and RECC+ teachers responsive practices including helping children manage their behavior, establishing a predictable schedule, and use of cognitively stimulating activities (e.g., shared book reading) compared with controls; however, teacher behaviors did not differ for focal areas such as sensitivity and positive discipline supports. Child assessments demonstrated that children in the interventions outperformed controls in areas of social and emotional development, although childrens performance in control and intervention groups was similar for cognitive skills (language, literacy, and math). Results support the positive impact of responsive teachers and environments providing appropriate support for toddlers social and emotional development. Possible explanations for the absence of systematic differences in childrens cognitive skills are considered, including implications for practice and future research targeting low-income toddlers.

Hearing-impaired students learning new words from written context

Normally hearing students acquire most of their reading vocabulary from printed context, but little is known about this process in hearing-impaired students. Two studies, therefore, investigated hearing-impaired students ability to derive lexical and syntactic information about unknown words embedded in short passages of text. The passages varied in their informativeness about the meaning of the unknown words. Ability to derive at least a partial meaning for a word in context was determined both by the type of context and the reading comprehension levels of the students. However, there was no relationship between reading comprehension scores and ability to determine the form class of the words in context. The results are related to the importance of integrating semantic information into a meaning schema for the passage in order to acquire new meanings for unknown words and to the local strategies adopted by poorer readers when attempting to answer comprehension questions. Implications for explaining, and trying to ameliorate, the well-documented vocabulary limitations of hearing-impaired students are discussed.

The Role of Language in Theory of Mind Development.

Various arguments are reviewed about the claim that language development is critically connected to the development of theory of mind. The different theories of how language could help in this process of development are explored. A brief account is provided of the controversy over the capacities of infants to read others’ false beliefs. Then the empirical literature on the steps in theory of mind development is summarized, considering studies on both typically developing and various language-delayed children. Suggestions are made for intervention by speech language pathologists to enhance the child’s access to understanding the minds of others.

Deception dissociates from false belief reasoning in deaf children: Implications for the implicit versus explicit theory of mind distinction

Deception is a controversial aspect of theory of mind, and researchers disagree about whether it entails an understanding of the false beliefs of ones opponent. The present study asks whether children with delayed language and delayed explicit false belief reasoning can succeed on explicit deception tasks. Participants were 45 orally taught deaf children with varying language delays aged 4.5-8 years and 45 hearing children aged 3.5-6 years. Participants received a battery of language, executive function, deception, and both verbal and low-verbal false belief tasks. The result reveal a dissociation of deception and false belief tasks: the deaf children are on par with their hearing peers on deception games, but show significant delays in false belief tasks even when the language demands are made minimal. Furthermore, different skills are predictors of success for the two types of task in the deaf children: language, and in particular complement syntax, is the best predictor of false belief reasoning; but executive function skills, especially inhibitory control, are the best predictors of deception. It is argued that deception at this level can be handled by behaviour rules without reference to mental states.

Impacts of a Comprehensive School Readiness Curriculum for Preschool Children at Risk for Educational Difficulties.

This article reports findings from a cluster-randomized study of an integrated literacy- and math-focused preschool curriculum, comparing versions with and without an explicit socioemotional lesson component to a business-as-usual condition. Participants included 110 classroom teachers from randomized classrooms and approximately eight students from each classroom (N = 760) who averaged 4.48 (SD = 0.44) years of age at the start of the school year. There were positive impacts of the two versions of the curriculum on language, phonological awareness, math, and socioemotional outcomes, but there were no added benefits to academic or socioemotional outcomes for the children receiving explicit socioemotional instruction. Results are discussed with relevance to early childhood theory, policy, and goals of closing the school readiness gap.