The role of language proficiency and statistical learning in on-line comprehension of syntax among bilingual adult readers

Statistical learning (SL) is the ability to identify co-occurring regularities from the environment, and has been implicated in learning across a range of skills, including language. This research project investigated whether there are associations between SL and on-line sentence processing in L1 Chinese L2 English bilinguals, and sought to examine whether second language proficiency mediated the relationship between visual SL and L2 language processing. To this end, two studies were conducted. In Study 1, sixty Chinese-English bilinguals completed a self-paced reading task in Mandarin and English, which tested participants’ on-line processing of subject and object relative clauses (RCs). They also completed a nonlinguistic visual SL task and a battery of additional measures measuring L2 English proficiency and general cognitive abilities. The results revealed that only nonverbal intelligence predicted L1 Chinese RCs processing, and neither visual SL capacity nor L2 proficiency predicted L2 English RCs processing. One possible explanation is that SL is partially modality-specific. Therefore, an auditory SL task was employed in addition to visual SL task in Study 2. In Study 2, fifty-two native Mandarin-speaking adults completed tests of visual and auditory SL, a self-paced reading task measuring the online processing of Mandarin relative clauses, and measures of general cognitive abilities. The results showed that auditory SL capacity independently predicted reading times in the self-paced reading task. Visual SL was also related to language processing, although the effect was marginal. The findings from Study 2 suggest that individual differences in adults’ capacity for SL are associated with on-line processing of Chinese

Applying pause analysis to explore cognitive processes in the copying of sentences by second language users

Pause analysis is a method that investigates processes of writing by measuring the amount of time between pen strokes. It provides the field of second language studies with a means to explore the cognitive processes underpinning the nature of writing. This study examined the potential of using free handwritten copying of sentences as a means of investigating components of the cognitive processes of adults who have English as their Second Language (ESL). A series of one pilot and three experiments investigated possible measures of language skill and the factors that influence the quality of the measures. The pilot study, with five participants of varying English competence, identified copying without pre-reading to be an effective task and ‘median’ at the beginning of words to be an effective measure. Experiment 1 (n=20 Malaysian speakers) found jumbled sentences at the letter and word levels to effectively differentiate test-taker competence in relation to grammatical knowledge. Experiment 2 (n=20 Spanish speakers) investigated the jumbling effects further, but found that participants varied their strategy depending on the order of the sentence types. As a result, Experiment 3 (n= 24 Malaysian speakers) used specific task instructions to control participant strategy use, so that they either attended to the meaning of the sentences, or merely copied as quickly as possible. Overall, these experiments show that it is feasible to apply pause analysis to cognitively investigate both grammar and vocabulary components of language processing. Further, a theoretical information processing model of copying (MoC) was developed. The model assists in the analysis and description of (1) the flow of copying processes; (2) the factors that might affect longer or shorter pauses amongst participants of varying competence level; and (3) sentence stimuli design

The Effects of Neurocognitive Aging on Sentence Processing

Across the lifespan, successful language comprehension is crucial for continued participation in everyday life. The success of language comprehension relies on the intact functioning of both language-specific processes as well as domain-general cognitive processes that support language comprehension in general. This two-sided nature of successful language comprehension may contribute to the two diverging observations in healthy aging: the preservation and the decline of language comprehension on both the cognitive and the neural level. To date, our understanding of these two competing facets is incomplete and unclear. While greater language experience comes with increasing age, most domain-general cognitive functions, like verbal working memory, decline in healthy aging. The here presented thesis shows that when the electrophysiological network relevant for verbal working memory is already compromised at rest, language comprehension declines in older adults. Moreover, it could be shown that, as verbal working memory capacity declines with age, resources may be- come insufficient to successfully encode language-specific information into memory, yielding language comprehension difficulties in old age. Age differences in the electrophysiological dynamics underlying sentence encoding indicate that the encoding of detailed information may increasingly be inhibited throughout the lifespan, possibly to avoid overloading the verbal working memory. However, limitations in verbal working memory could be attenuated by the use of language-specific constraints. That is, semantic and syntactic constraints can be used to establish relations between words which reduces the memory load from individual word information to information about word group. Here, it was found that older adults do not benefit from the use of syntactic constraints as much as younger adults while the benefit of using semantic constraints was comparable across age. Overall, the here presented thesis suggests that previous findings on language comprehension in healthy aging are not contradictory but rather converge on a simultaneous combination of selective preservation and decline of various language-specific processes, burdened by domain-general neurocognitive aging

The effects of age and expertise on discourse processing

The paradoxical nature of adult development is that it is marked by a decline in processing capacity but an increase in knowledge. A specialized formulation of increased knowledge that can occur throughout the lifespan is expertise. Because discourse processing is both a method of acquiring domain expertise and is facilitated by domain expertise, the nature of this interrelationship is central to successful aging. However, the processes through which expertise facilitates discourse processing are virtually unexplored within the cognitive aging literature. Four experiments investigating this issue are presented. The first experiment investigated age differences in on-line reading strategies of readers with high and low recall using passages in which expertise was induced by giving high-knowledge subjects titles to passages that were otherwise incoherent. In Experiment 2, age differences in parsing mechanisms underlying discourse processing of high- and low-knowledge listeners were examined using speech segmentation methodology. Experiment 3 was conducted to examine age differences in the effects of task demands on the reading strategies of high- and low-knowledge adults. Lastly, in Experiment 4, age differences in discourse processing strategies were investigated in the real-world domain of cooking

More is more in language learning:reconsidering the less-is-more hypothesis

The Less-is-More hypothesis was proposed to explain age-of-acquisition effects in first language (L1) acquisition and second language (L2) attainment. We scrutinize different renditions of the hypothesis by examining how learning outcomes are affected by (1) limited cognitive capacity, (2) reduced interference resulting from less prior knowledge, and (3) simplified language input. While there is little-to-no evidence of benefits of limited cognitive capacity, there is ample support for a More-is-More account linking enhanced capacity with better L1- and L2-learning outcomes, and reduced capacity with childhood language disorders. Instead, reduced prior knowledge (relative to adults) may afford children with greater flexibility in inductive inference; this contradicts the idea that children benefit from a more constrained hypothesis space. Finally, studies of childdirected speech (CDS) confirm benefits from less complex input at early stages, but also emphasize how greater lexical and syntactic complexity of the input confers benefits in L1-attainment

Some shortcomings of long-term working memory

Within the framework of their long-term working memory theory, Ericsson and Kintsch (1995) propose that experts rapidly store information in long-term memory through two mechanisms: elaboration of long-term memory patterns and schemas and use of retrieval structures. They use chess players’ memory as one of their most compelling sources of empirical evidence. In this paper, I show that evidence from chess memory, far from supporting their theory, limits its generality. Evidence from other domains reviewed by Ericsson and Kintsch, such as medical expertise, is not as strong as claimed, and sometimes contradicts the theory outright. I argue that Ericsson and Kintsch’s concept of retrieval structure conflates three different types of memory structures that possess quite different properties. One of these types of structures—generic, general-purpose retrieval structures—has a narrower use than proposed by Ericsson and Kintsch: it applies only in domains where there is a conscious, deliberate intent by individuals to improve their memory. Other mechanisms, including specific retrieval structures, exist that permit a rapid encoding into long-term memory under other circumstances