L2 interpretation of negative polar questions: Evidence from online experiments

This paper studies Korean L2 English learners’ responses to negative polar questions (NPQs – i.e., negative yes-no questions), focusing on the differences between EFL learners (those learning English as a foreign language in Korea) and ESL learners (those learning English as US residents). The paper first considers differences in the syntax and semantics of Korean and English NPQs, differences that may lead to misinterpretations when questions are translated from one language to the other. The paper then describes a series of experiments comparing Korean EFL and ESL learners’ responses to English polar questions, focusing on measuring participants’ response times (RTs) and unexpected responses (UERs) to distinct classes of these

The effects of focus on scope relations between quantifiers and negation in Korean

This paper addresses the effects of focus-marking (i.e. nun-marking) on the scope of quantified expressions in Korean negation constructions and shows how these inform the analysis of Korean negation constructions generally. Specifically, highlighting the "Rigid Scope" properties of Korean (in contrast with English), focus-marking in Korean negation constructions eliminates quantifier/negative scope ambiguities. In all cases but one, a focus-marked element has scope over all others. The anomalous case involving contrastive focus of object universal quantifiers brings the semantics of quantifiers into opposition with the semantics of contrastive focus

Subjacency effects on overt wh-movement in wh-in-situ languages: Evidence for nominal structure

This paper investigates whether overt wh-movement in Korean, a wh-in-situ language, triggers Subjacency violations in the same set of bounding configurations as English. Yoon (2013) and Jung (2015) showed that Korean wh-islands display Subjacency effects, and we ask whether the Complex NP and Coordinate Structure Constraints are also observed. We find that they are not. We propose that this is because Korean nominal expressions need not project DP. Our analysis supports previous accounts of Korean nominal structure (Kim et al. 2010), which suggest (based on optionality of determiners) that “Korean NP structure is non-configurational or lacks the category D.

Negative Polar Questions and Answers in English and Korean

The meaning of positive polar questions (PPQs) is relatively straightforward, so the truth conditions of PPQs can be decided easily. In contrast, the meaning of negative polar questions (NPQs) may vary, and simple yes-no answers to NPQs have seemingly unpredictable interpretations. For example, a simple yes answer to a PPQ like ‘Did you have lunch today?’ is easily interpreted as ‘I ate lunch.’ In contrast, the same yes answer to an NPQ like ‘Did you not eat lunch today?’ is not obvious out of context. Why are NPQs more ambiguous than PPQs? Based on our empirical observations of the difference in degree of ambiguity between PPQs and NPQs, it is assumed that the negation in NPQs somehow affects truth-conditions syntactically, semantically, and pragmatically. Traditionally, the answering pattern of NPQs is categorized into two distinct systems: polarity-based and truth-based. Following this typology, it has been widely received that a yes answer to ‘Didn’t you eat lunch today?’ denotes ‘I ate lunch’ in polarity-based languages, whereas it denotes ‘I didn’t eat lunch’ in truth-based languages. A major part of this dissertation is devoted to proposing that the traditional dichotomy is only an apparent one and that the superficial “typological” distinctions posited for them are, in fact, attributable to the distinct structures of negation in each language, the potential for ambiguity in some of these, and to the relative complexity and frequency of negation structures in each language. Furthermore, the inherent ambiguity of NPQs raises several intriguing questions regarding the discrepancy between L1 and L2 interpretations. The distinguished linguistic features of NPQ structures consequently affect the predominant interpretation of NPQs in a language. The existence of cross-linguistic differences between L1-L2 might cause severe misunderstanding if L2 learners do not have sufficient proficiency to understand the delicate nuance of various PQs in the target language. The final chapter of this dissertation, as a supplement to the main chapters of the dissertation, will introduce some teachability and learnability issues on the L2 acquisition of NPQs and establish research agendas for future studies

The syntax and semantics of negative questions and answers in Korean and English

Differences in Korean and English negative polarity questions (NPQs) are revealed by the interpretation of simple yes-no answers to them. Yes-no answers to NPQs have seemingly unpredictable interpretations (Claus et al. 2017, Holmberg 2013, Kim 2017, Krifka 2017, Kramer & Rawlins 2009, Ladd 1981, Sudo 2013). However, one clearly observable fact is that yes-no answers to English and Korean NPQs can have opposite interpretations. This study: (i) compares the interpretation of positive and negative polarity questions (PPQs and NPQs) in English and Korean; (ii) examines the structure of negation in each language and its interaction with NPQs; and (iii) reports on an online experiment which gathered native speaker interpretations of NPQs in each language under context-free conditions

Implantable acousto-optic window for monitoring ultrasound-mediated neuromodulation in vivo

Significance: Ultrasound has recently received considerable attention in neuroscience because it provides noninvasive control of deep brain activity. Although the feasibility of ultrasound stimulation has been reported in preclinical and clinical settings, its mechanistic understanding remains limited. While optical microscopy has become the "gold standard" tool for investigating population-level neural functions in vivo, its application for ultrasound neuromodulation has been technically challenging, as most conventional ultrasonic transducers are not designed to be compatible with optical microscopy. Aim: We aimed to develop a transparent acoustic transducer based on a glass coverslip called the acousto-optic window (AOW), which simultaneously provides ultrasound neuromodulation and microscopic monitoring of neural responses in vivo. Approach: The AOW was fabricated by the serial deposition of transparent acoustic stacks on a circular glass coverslip, comprising a piezoelectric material, polyvinylidene fluoride-trifluoroethylene, and indium-tin-oxide electrodes. The fabricated AOW was implanted into a transgenic neural-activity reporter mouse after open craniotomy. Two-photon microscopy was used to observe neuronal activity in response to ultrasonic stimulation through the AOW. Results: The AOW allowed microscopic imaging of calcium activity in cortical neurons in response to ultrasound stimulation. The optical transparency was similar to 40 % over the visible and near-infrared spectra, and the ultrasonic pressure was 0.035 MPa at 10 MHz corresponding to 10 mW / cm(2). In anesthetized Gad2-GCaMP6-tdTomato mice, we observed robust ultrasound-evoked activation of inhibitory cortical neurons at depths up to 200 mu m. Conclusions: The AOW is an implantable ultrasonic transducer that is broadly compatible with optical imaging modalities. The AOW will facilitate our understanding of ultrasound neuromodulation in vivo. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License.Y

Ultrasonocoverslip: In-vitro platform for high-throughput assay of cell type-specific neuromodulation with ultra-low-intensity ultrasound stimulation

Brain stimulation with ultra-low-intensity ultrasound has rarely been investigated due to the lack of a reliable device to measure small neuronal signal changes made by the ultra-low intensity range. We propose Ultrasonocoverslip, an ultrasound-transducer-integrated-glass-coverslip that determines the minimum intensity for brain cell activation. Brain cells can be cultured directly on Ultrasonocoverslip to simultaneously deliver uniform ultrasonic pressure to hundreds of cells with real-time monitoring of cellular responses using fluorescence microscopy and single-cell electrophysiology. The sensitivity for detecting small responses to ultra-low-intensity ultrasound can be improved by averaging simultaneously obtained responses. Acoustic absorbers can be placed under Ultrasonocoverslip, and stimuli distortions are substantially reduced to precisely deliver user-intended acoustic stimulations. With the proposed device, we discover the lowest acoustic threshold to induce reliable neuronal excitation releasing glutamate. Furthermore, mechanistic studies on the device show that the ultra-low-intensity ultrasound stimulation induces cell type-specific neuromodulation by activating astrocyte-mediated neuronal excitation without direct neuronal involvement. The performance of ultra-low-intensity stimulation is validated by in vivo experiments demonstrating improved safety and specificity in motor modulation of tail movement compared to that with supra-watt-intensity

Improving collection efficiency in two-photon endoscopy with reflective waveguiding

Two-photon endoscopy based on a gradient-index lens has been widely utilized for studying cellular behaviors in deep-lying tissues with minimal invasiveness in vivo. Although the efficient collection of emitted light is critical to attain high-contrast spatiotemporal information, the intrinsic low numerical aperture of the endoscopic probe poses a physical limitation. We report a simple solution to overcome this limit by incorporating a reflective waveguide ensheathing the endoscopic probe, which improves the collection efficiency by approximately two-fold. We describe its principle, fabrication procedure, optical characterization, and utilities in biological tissues. © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement11sciescopu