Processing Preference Toward Object-Extracted Relative Clauses in Mandarin Chinese by L1 and L2 Speakers: An Eye-Tracking Study

Transcranial photobiomodulation on the left inferior frontal gyrus enhances Mandarin Chinese L1 and L2 complex sentence processing performances

This study investigated the causal enhancing effect of transcranial photobiomodulation (tPBM) over the left inferior frontal gyrus (LIFG) on syntactically complex Mandarin Chinese first language (L1) and second language (L2) sentence processing performances. Two (L1 and L2) groups of participants (thirty per group) were recruited to receive the double-blind, sham-controlled tPBM intervention via LIFG, followed by the sentence processing, the verbal working memory (WM), and the visual WM tasks. Results revealed a consistent pattern for both groups: (a) tPBM enhanced sentence processing performance but not verbal WM for linear processing of unstructured sequences and visual WM performances; (b) Participants with lower sentence processing performances under sham tPBM benefited more from active tPBM. Taken together, the current study substantiated that tPBM enhanced L1 and L2 sentence processing, and would serve as a promising and cost-effective noninvasive brain stimulation (NIBS) tool for future applications on upregulating the human language faculty.

Subject Advantage in L1-English Learners' Production of Chinese Relative Clauses

This study investigated whether L1-English Chinese learners show a subject preference in their oral production of Chinese relative clauses (RCs) and whether they show animacy effects. We conducted a picture-based elicited production experiment that compared subject and object RCs, varying the object animacy between animate and inanimate. The results from thirty learners showed more targetlike performance in subject RCs than in object RCs, both at group and individual levels, regardless of object animacy. Error analyses revealed that more object RCs were converted into subject RCs than vice versa. These results point toward a clear subject preference despite conflicted findings in previous research on RCs in Chinese as a foreign language. Animacy influenced subject and object RCs alike: both types were easier to produce when featuring an inanimate object. We suggested similarity-based interference or distribution-based effects to account for this finding.

Use of Memory-Load Interference in Processing Spoken Chinese Relative Clauses

The processing advantage of Subject-gapped relative clause (SRC) versus Object-gapped relative clause (ORC) has been advocated by competing processing accounts. Using a self-paced listening paradigm, this study investigates what Chinese RC online processing asymmetry looks like under concurrent memory load manipulation. Both On-line listening times and Post-online measures of Chinese SRCs and ORCs are estimated and compared. The on-line results show that ORCs and SRCs demonstrate no differential processing patterns under the interfering conditions. At the relativizer-DE marker region, under 0-digt-load, SRCs show processing advantage, while under 5-digit-load condition, SRCs display greater listening times than ORCs. Furthermore, the Post-online RTs and accuracy of post-sentence comprehension and digit recalls show that processing of SRCs had worse performance. These results lead to the conjecture that there may be no intrinsic processing asymmetry in Chinese RCs, and underscore the necessity that future studies in exploring the processing metrics of sentence complexity should consider the working memory involvement.

Is There a Processing Preference for Object Relative Clauses in Chinese? Evidence From ERPs

A consistent finding across head-initial languages, such as English, is that subject relative clauses (SRCs) are easier to comprehend than object relative clauses (ORCs). However, several studies in Mandarin Chinese, a head-final language, revealed the opposite pattern, which might be modulated by working memory (WM) as suggested by recent results from self-paced reading performance. In the present study, event-related potentials (ERPs) were recorded when participants with high and low WM spans (measured by forward digit span and operation span tests) read Chinese ORCs and SRCs. The results revealed an N400-P600 complex elicited by ORCs on the relativizer, whose magnitude was modulated by the WM span. On the other hand, a P600 effect was elicited by SRCs on the head noun, whose magnitude was not affected by the WM span. These findings paint a complex picture of relative clause processing in Chinese such that opposing factors involving structural ambiguities and integration of filler-gap dependencies influence processing dynamics in Chinese relative clauses.

Ambiguity in the processing of Mandarin Chinese relative clauses: One factor cannot explain it all

This study addresses the question of whether native Mandarin Chinese speakers process and comprehend subject-extracted relative clauses (SRC) more readily than object-extracted relative clauses (ORC) in Mandarin Chinese. Presently, this has been a hotly debated issue, with various studies producing contrasting results. Using two eye-tracking experiments with ambiguous and unambiguous RCs, this study shows that both ORCs and SRCs have different processing requirements depending on the locus and time course during reading. The results reveal that ORC reading was possibly facilitated by linear/temporal integration and canonicity. On the other hand, similarity-based interference made ORCs more difficult, and expectation-based processing was more prominent for unambiguous ORCs. Overall, RC processing in Mandarin should not be broken down to a single ORC (dis)advantage, but understood as multiple interdependent factors influencing whether ORCs are either more difficult or easier to parse depending on the task and context at hand.

An Event Related Field Study of Rapid Grammatical Plasticity in Adult Second-Language Learners

The present study used magnetoencephalography (MEG) to investigate how Spanish adult learners of Basque respond to morphosyntactic violations after a short period of training on a small fragment of Basque grammar. Participants (n = 17) were exposed to violation and control phrases in three phases (pretest, training, generalization-test). In each phase participants listened to short Basque phrases and they judged whether they were correct or incorrect. During the pre-test and generalization-test, participants did not receive any feedback. During the training blocks feedback was provided after each response. We also ran two Spanish control blocks before and after training. We analyzed the event-related magnetic- field (ERF) recorded in response to a critical word during all three phases. In the pretest, classification was below chance and we found no electrophysiological differences between violation and control stimuli. Then participants were explicitly taught a Basque grammar rule. From the first training block participants were able to correctly classify control and violation stimuli and an evoked violation response was present. Although the timing of the electrophysiological responses matched participants' L1 effect, the effect size was smaller for L2 and the topographical distribution differed from the L1. While the L1 effect was bilaterally distributed on the auditory sensors, the L2 effect was present at right frontal sensors. During training blocks two and three, the violation-control effect size increased and the topography evolved to a more L1-like pattern. Moreover, this pattern was maintained in the generalization test. We conclude that rapid changes in neuronal responses can be observed in adult learners of a simple morphosyntactic rule, and that native-like responses can be achieved at least in small fragments of second language.