Weiyi Ma

Word Learning in Infant- and Adult-Directed Speech

Infant-directed speech (IDS), compared with adult-directed speech (ADS), is characterized by a slower rate, a higher fundamental frequency, greater pitch variations, longer pauses, repetitive intonational structures, and shorter sentences. Despite studies on the properties of IDS, there is no direct demonstration of its effects for word learning in infants. This study examined whether 21- and 27-month-old children learned novel words better in IDS than in ADS. Two major findings emerged. First, 21-month-olds reliably learned words only in the IDS condition, although children with relatively larger vocabulary than their peers learned in the ADS condition as well. Second, 27-month-olds reliably learned the words in the ADS condition. These results support the implicitly held assumption that IDS does in fact facilitate word mapping at the start of lexical acquisition and that its influence wanes as language development proceeds.

Imageability predicts the age of acquisition of verbs in Chinese children

Verbs are harder to learn than nouns in English and in many other languages, but are relatively easy to learn in Chinese. This paper evaluates one potential explanation for these findings by examining the construct of imageability, or the ability of a word to produce a mental image. Chinese adults rated the imageability of Chinese words from the Chinese Communicative Development Inventory (Tardif et al., in press). Imageability ratings were a reliable predictor of age of acquisition in Chinese for both nouns and verbs. Furthermore, whereas early Chinese and English nouns do not differ in imageability, verbs receive higher imageability ratings in Chinese than in English. Compared with input frequency, imageability independently accounts for a portion of the variance in age of acquisition (AoA) of verb learning in Chinese and English.

Twenty-Five Years Using the Intermodal Preferential Looking Paradigm to Study Language Acquisition What Have We Learned?

The intermodal preferential looking paradigm (IPLP) has proven to be a revolutionary method for the examination of infants’ emerging language knowledge. In the IPLP, infants’ language comprehension is measured by their differential visual fixation to two images presented side-by-side when only one of the images matches an accompanying linguistic stimulus. Researchers can examine burgeoning knowledge in the areas of phonology, semantics, syntax, and morphology in infants not yet speaking. The IPLP enables the exploration of the underlying mechanisms involved in language learning and illuminates how infants identify the correspondences between language and referents in the world. It has also fostered the study of infants’ conceptions of the dynamic events that language will express. Exemplifying translational science, the IPLP is now being investigated for its clinical and diagnostic value.

Enhanced functional connectivity and increased gray matter volume of insula related to action video game playing

Research has shown that distinct insular subregions are associated with particular neural networks (e.g., attentional and sensorimotor networks). Based on the evidence that playing action video games (AVGs) facilitates attentional and sensorimotor functions, this study examined the relation between AVG experience and the plasticity of insular subregions and the functional networks therein that are related to attentional and sensorimotor functions. By comparing AVG experts and amateurs, we found that AVG experts had enhanced functional connectivity and grey matter volume in insular subregions. Furthermore, AVG experts exhibited increased functional connectivity between the attentional and sensorimotor networks, and the experience-related enhancement was predominantly evident in the left insula, an understudied brain area. Thus, AVG playing may enhance functional integration of insular subregions and the pertinent networks therein.

Dissociation of tone and vowel processing in Mandarin idioms.

Using event-related potentials, this study measured the access of suprasegmental (tone) and segmental (vowel) information in spoken word recognition with Mandarin idioms. Participants performed a delayed-response acceptability task, in which they judged the correctness of the last word of each idiom, which might deviate from the correct word in either tone or vowel. Results showed that, compared with the correct idioms, a larger early negativity appeared only for vowel violation. Additionally, a larger N400 effect was observed for vowel mismatch than tone mismatch. A control experiment revealed that these differences were not due to low-level physical differences across conditions; instead, they represented the greater constraining power of vowels than tones in the lexical selection and semantic integration of the spoken words. Furthermore, tone violation elicited a more robust late positive component than vowel violation, suggesting different reanalyses of the two types of information. In summary, the current results support a functional dissociation of tone and vowel processing in spoken word recognition.

Human emotions track changes in the acoustic environment.

Significance Emotions function to optimize adaptive responses to biologically significant events. In the auditory channel, humans are highly attuned to emotional signals in speech and music that arise from shifts in the frequency spectrum, intensity, and rate of acoustic information. We found that changes in acoustic attributes that evoke emotional responses in speech and music also trigger emotions when perceived in environmental sounds, including sounds arising from human actions, animal calls, machinery, or natural phenomena, such as wind and rain. The findings align with Darwin’s hypothesis that speech and music originated from a common emotional signal system based on the imitation and modification of sounds in the environment. Emotional responses to biologically significant events are essential for human survival. Do human emotions lawfully track changes in the acoustic environment? Here we report that changes in acoustic attributes that are well known to interact with human emotions in speech and music also trigger systematic emotional responses when they occur in environmental sounds, including sounds of human actions, animal calls, machinery, or natural phenomena, such as wind and rain. Three changes in acoustic attributes known to signal emotional states in speech and music were imposed upon 24 environmental sounds. Evaluations of stimuli indicated that human emotions track such changes in environmental sounds just as they do for speech and music. Such changes not only influenced evaluations of the sounds themselves, they also affected the way accompanying facial expressions were interpreted emotionally. The findings illustrate that human emotions are highly attuned to changes in the acoustic environment, and reignite a discussion of Charles Darwin’s hypothesis that speech and music originated from a common emotional signal system based on the imitation and modification of environmental sounds.

Electroencephalogram variations in the α band during tempo-specific perception.

As an interdisciplinary research field, music perception involves various disciplines, such as neuroscience, psychology, and even physics. As research on music perception offers us a window into the mechanism of the brain, this study examined Chinese nonmusicians’ electroencephalogram &agr;-band activity elicited by tempo variation. This study is the first to demonstrate electrophysiological evidence for the tempo-specific timing hypothesis by showing significant changes in the &agr;-band spectral power during tempo perception. Furthermore, results showed that a larger tempo transformation gave rise to a greater change in &agr;-band spectral power than a smaller tempo transformation.

The flexibility of partial information transmission in the auditory channel: The role of perceptual discriminability

A stimulus contains multiple attributes. Under certain circumstances, some information can be transmitted to the next cognitive stage before the processing of other information. An examination of partial information transmission is essential in improving our understanding of the mechanism of information processing. By manipulating two attributes, namely, pitch and intensity, this study examined whether the transmission speed of an attribute could be influenced by its perceptual discriminability. Using a choice go/no-go paradigm, this study presented adults with two pieces of pure tones and measured their LRPs. Results showed that pitch and intensity were transmitted earlier as partial information in the high pitch- and intensity-discriminability conditions, respectively. Thus, this study demonstrated that the transmission speed of a certain attribute could be modulated by its perceptual discriminability.

How Cognitive Plasticity Resolves the Brain's Information Processing Dilemma

A key unresolved question in cognitive science is whether the brain uses asynchronous or synchronous patterns of information transmission. Using an auditory learning task combined with electrophysiological recordings, we reveal for the first time that cognitive plasticity during learning transforms an asynchronous into a synchronous transmission pattern to achieve rapid, error-free performance. We also present a new model showing how the brain may resolve its information processing and transmission dilemma.

How Does Meaning Specificity Affect Verb Learning and Extension

Although verbs are in general harder to learn than nouns, children’s early vocabularies do contain some verbs (e.g., Fenson et al. 1994). Furthermore, children’s early vocabularies contain a much higher proportion of verbs in Chinese than in English (e.g., Tardif et al. 2008). One explanation for Chinese children’s relative verb advantage is the high input frequency of verbs in child-directed speech (Tardif, Shatz & Naigles 1997). Another explanation is the high imageability of early Chinese verbs (Ma, Golinkoff, Hirsh-Pasek, McDonough & Tardif 2009). “Imageability” refers to a word’s capability to generate a mental image (Paivio, Yuille & Madigan 1968). Words learned early are more imageable than words learned later, independent of form class and language (e.g., Gilhooly & Logie 1980). But what about verb meaning is imageability tapping? High imageability may reflect the specificity of verb meaning such that verbs with narrower meanings may be easier to learn than verbs with broader meanings, as the correlational results suggest. This is the first experimental test of the imageability hypothesis: Would children more readily learn more specific than less specific verb meanings when all other factors were controlled? Forty-seven English-speaking three-year-olds participated in this study. Using video display, participants learned two novel verbs (twilling and clooming). In the training, participants watched two video clips illustrating each verb. For each participant, one novel verb served as a narrow verb, and the other verb as a broad verb. A narrow verb referred to two actions with slightly different manners, and a broad verb referred to two actions with more variable