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Research suggests that novel word learning tasks engage both verbal short-term memory (STM) and lexical processing, and may serve as a potential treatment for word processing and functional language in aphasia (e.g., Gupta, Martin, Abbs, Schwartz, Lipinski, 2006; Tuomiranta, Grönroos, Martin, & Laine, 2014). The purpose of this study was to gain support for the hypotheses that novel word learning engages verbal STM and lexical access processes and can be used to promote improvements in these abilities in treatment of aphasia. We used a novel word learning task as a treatment with three participants: KT, UP, and CN, presenting with different types and severities of aphasia and predicted that treatment would result in (1) acquisition of trained novel words (2) improved verbal STM capacity and (3) improved access to and retrieval of real words. Twenty novel words were trained for 1 hour x 2 days/week x 4 weeks. Language and learning measures were administered pre- and post-treatment. All three participants showed receptive learning and some improvement on span tasks, while UP and CN demonstrated some expressive learning. KT also improved in performance on the Peabody Picture Vocabulary Test and the Philadelphia Naming Test. UP showed significant improvement on proportion Correct Information Units (CIUs) in discourse. CN showed some minimal improvement in narrative production for proportion CIUs and proportion of closed class words. These findings support that novel word learning treatment, which engages verbal STM processes and lexical retrieval pathways, can improve input lexical processing. Theoretically, this study provides further evidence for models that propose common mechanisms supporting novel word learning, short-term memory, and lexical processing. / Communication Sciences

Sensitive and responsive parenting promotes adaptive outcomes for children. Within the domain of language development, responsiveness has been examined through the effects of temporal and semantic contingency on children’s vocabularies. The term adaptive contingency can be used to characterize the process whereby dyads co-construct common ground, establishing a co-dependence of both timing and meaningfulness. This dissertation examined the role of adaptive contingency in early verb learning by examining the learning consequences when timing is manipulated but meaning is held constant (Study 1) and when meaningfulness is manipulated but timing is held constant (Study 2). In a previous study, toddlers learned novel action words when teaching was uninterrupted, but failed to do so when caregivers were interrupted while teaching by a cell phone call from the experimenter (Reed, Hirsh-Pasek, & Golinkoff, in preparation). Study 1 explored how the timing of interruptions differentially affects word learning. Experimenters blind to study hypotheses taught two-year old toddlers novel words, and learning was assessed via the Intermodal Preferential Looking Paradigm (IPLP). During the teaching period, experimenters responded to text messages, momentarily disrupting the teaching. The timing of these interruptions occurred (1) in the middle of an utterance, such that the label and demonstration of its action referent were decoupled, (2) before the “label + action referent” event occurred, or (3) after (the control condition). At test, only children in the after condition learned the novel words. Study 2 examined whether word learning would be disrupted when teaching interactions were interrupted by an event that breaks the shared focus (e.g., a cell phone call) but not when the interruption shifts the shared context (e.g., when a lighted display suddenly shines). Novel words were learned in one of three experimental conditions (light display to shift attention, cell phone call to break attention, no interruption control), and learning was again assessed via the IPLP. Only toddlers in the shift condition learned the novel words. This dissertation contributes to the growing recognition that the quality of interactions with caregivers affects children’s language trajectories (e.g., rich and diverse vocabulary, Rowe, 2012; fluent and connected bouts of sustained joint attention, Hirsh-Pasek et al., in press). Utilizing ecologically valid interruptions, the two studies together illuminate how the social context can support or hinder early verb learning. / Psychology

Short-term memory (STM) has demonstrated to be affected by serial order, involving the use of rhythm and entrainment to stimuli. However, less is known of the extent of this relationship and language learning, and the literature focuses on words rather than sentences. Moreover, the literature lacks an exploration of whether this relationship has a correlation with MMN responses. We had 30 participants (21 female) complete two sentence repetition tasks, a temporal rhythm accuracy task, and two temporal order judgment tasks. We also recorded the electroencephalograms (EEG) from 24 of the participants (17 female) while they listened to syllables differing by time of presentation and differing by consonant and vowel. We then correlated performance on these tasks to performance on a foreign-word learning (FWL) task. We hypothesized that the STM tasks would predict performance in the FWL task, and we explored whether temporal accuracy and word learning correlated with MMN responses to early stimuli. We found that only the foreign sentence repetition task significantly predicted performance in the FWL task. We also did not find any significant correlations with MMN responses and temporal accuracy and word learning abilities. Findings show that with previous exposure to a novel language, the prosodic pattern of the foreign language is stored temporarily in STM, which enhances learning of the foreign words. Further exploration is needed to understand the relationship of temporal order and language learning with cortical responses. / Thesis / Master of Science (MSc) / Spoken language is driven by rhythm and keeping track of this rhythm allows us to keep track of the order in which sounds in language are presented. Remembering the order of items requires the use of short-term memory. The better one is at repeating back the order of items, the better they are at learning new words. This thesis investigates the relationship between various short-term memory tasks (English nonword sentence repetition task, foreign sentence repetition task, temporal rhythm accuracy task, auditory judgment task, visual judgment task) and foreign-word learning. This thesis also explores whether there is a correlation between one’s brain responses to differing stimuli and a person’s ability to track the timing and order of items, as well as a person’s ability to learn new words. The results reveal that only the foreign sentence repetition task, using the same foreign language as the word learning task, significantly predicts one’s ability to accurately learn foreign words. The results did not show any significant interaction between one’s neural responses and rhythm or word learning. These results suggest that the ability to maintain the order of items in memory aids word learning, but further exploration is required with regards to non-verbal stimuli and neural responses. It is important to investigate individual differences in repetition tasks that require short-term memory, as this will aid in understanding normal language development and language acquisition.

Research suggests that children are only able to flexibly apply more than one label (e.g. mouse and animal) in one situation with one conversational partner after they pass standard false belief tasks. Both abilities have been attributed to the understanding of perspective. The aim of the studies was to extend previous research to examine the disambiguation effect, children’s tendency to select an unfamiliar object in the presence of another but familiar object as referent for a novel word. Theoretical considerations suggest this effect initially results from a lack of understanding perspective. Five studies were conducted in Scotland and Austria, involving 243 children between the ages of 2.5 and 6.5. Studies 1 to 3 compared the standard disambiguation task with a task in which a strong pragmatic cue indicates the familiar object is the correct referent. Performances on these tasks were compared with performances on the false belief task, the alternative naming task, as well as tests of executive functioning. Studies 4 and 5 extended these methods to examine bilingual children’s metacognitive abilities in relation to word learning. Children become able to suspend the disambiguation effect when presented with strong pragmatic cues at the same time as they pass false belief and alternative naming tasks (Experiment 1). This can neither be attributed to impulsivity or the ability to inhibit a response, nor order effects of pragmatic cues and novel words (Experiment 2). Children’s ability to apply two labels to one object in a correction task also related to their perspectival understanding. Previous findings that suggested that younger children could produce multiple labels in a misnaming paradigm were not replicated (Experiment 3 a, b). The developmental change in children’s metalinguistic behaviour was demonstrated to follow the same trajectory in monolinguals, bilinguals and children exposed to another language (Experiment 4 and 5). Bilinguals show a marginally better ability to recall novel foreign language labels. The disambiguation effect is the result of cognitive immaturity in young children. Older children show a change in behaviour at the same time as they present more metacognitive maturity. Common development with theory of mind and metalinguistic abilities is attributed to an understanding of perspective.

Data are presented in seven chapters that address the reciprocal relationship between oral vocabulary and reading development. Chapter 2 explores exception word reading in poor comprehenders longitudinally, finding deficits that are pervasive over a period of two years. The results support the hypothesis that weak oral vocabulary skills are causally related to poor exception word reading in this group. In Chapter 3, orthographic and semantic skills in poor comprehenders are investigated in a word learning paradigm. This chapter provides evidence that poor comprehenders have more difficulty learning and retaining semantic information than orthographic information. A similar paradigm is described in Chapter 4 to investigate predictors of orthographic and semantic learning. In a large group of typically developing readers, this demonstrates that decoding is the strongest predictor of orthographic learning while existing oral vocabulary knowledge is the strongest predictor of semantic learning. In Chapters 5 and 6 orthographic and semantic skills in poor comprehenders and children with dyslexia are compared using standard off-line tasks (Chapter 5) and an online word learning experiment (Chapter 6). These chapters indicate similarities as well as differences in the reading and language profiles of these groups. Chapter 7 adopts a different approach by using a word learning study to investigate the benefit of teaching new oral vocabulary in the presence of orthography.

The preferential looking paradigm was used to investigate how toddlers integrate recently learned grammatical cues with well-established social cues in a novel word-learning scenario. To test this we examined children’s ability to decipher the referent of a novel noun using the grammatical information from a plural cue and social information from an eye-gaze cue. Experiment 1 is the first study showing that children as young as 24 months of age can rely on plural markings alone to infer the referent of a novel noun. Preliminary results of Experiment 2 suggest that when the plural cue is presented alongside contradicting information from a gaze direction cue, children still map the novel word to the grammatically cued object. Taken together, these results suggest that by the time children reach their second birthday, even newly learned grammatical information, such as plural markings, might already outweigh established social cues.

The preferential looking paradigm was used to investigate how toddlers integrate recently learned grammatical cues with well-established social cues in a novel word-learning scenario. To test this we examined children’s ability to decipher the referent of a novel noun using the grammatical information from a plural cue and social information from an eye-gaze cue. Experiment 1 is the first study showing that children as young as 24 months of age can rely on plural markings alone to infer the referent of a novel noun. Preliminary results of Experiment 2 suggest that when the plural cue is presented alongside contradicting information from a gaze direction cue, children still map the novel word to the grammatically cued object. Taken together, these results suggest that by the time children reach their second birthday, even newly learned grammatical information, such as plural markings, might already outweigh established social cues.