Mora or more? The phonological unit of Japanese word production in the Stroop color naming task

In English, Dutch, and other European languages, it is well established that the fundamental phonological unit in word production is the phoneme; in contrast, recent studies have shown that in Chinese it is the (atonal) syllable and in Japanese the mora. The present study investigated whether this cross-language variation in the size of the unit of word production is due to the type of script used in the language (i.e., alphabetic, morphosyllabic, or moraic). Capitalizing on the multiscriptal nature of Japanese, and using the Stroop color naming task, we show that the overlap in the initial mora between the color name and the written distractor facilitates color naming independent of script type. These results confirm the mora as the phonological unit of word production in Japanese, and establish the Stroop color naming task as a useful task for investigating the fundamental (or "proximate") phonological unit used in speech production

Word processing in languages using non-alphabetic scripts: The cases of Japanese and Chinese

This thesis investigates the processing of words written in Japanese kanji and Chinese hànzì, i.e. logographic scripts. Special attention is given to the fact that the majority of Japanese kanji have multiple pronunciations (generally depending on the combination a kanji forms with other characters). First, using masked priming, it is established that upon presentation of a Japanese kanji multiple pronunciations are activated. In subsequent experiments using word naming with context pictures it is concluded that both Chinese hànzì and Japanese kanji are read out loud via a direct route from orthography to phonology. However, only Japanese kanji become susceptible to semantic or phonological context effects as a result of a cost due to the processing of multiple pronunciations. Finally, zooming in on the size of the articulatory planning unit in Japanese it is concluded that the mora as a phonological unit best complies with the observed data pattern and not the phoneme or the syllabl

Orthographic properties of distractors do influence phonological Stroop effects: Evidence from Japanese Romaji distractors

In attempting to understand mental processes, it is important to use a task that appropriately reflects the underlying processes being investigated. Recently, Verdonschot and Kinoshita (Memory & Cognition, 46,410-425, 2018) proposed that a variant of the Stroop task-the "phonological Stroop task"-might be a suitable tool for investigating speech production. The major advantage of this task is that the task is apparently not affected by the orthographic properties of the stimuli, unlike other, commonly used, tasks (e.g., associative-cuing and word-reading tasks). The viability of this proposal was examined in the present experiments by manipulating the script types of Japanese distractors. For Romaji distractors (e.g., "kushi"), color-naming responses were faster when the initial phoneme was shared between the color name and the distractor than when the initial phonemes were different, thereby showing a phoneme-based phonological Stroop effect (Experiment1). In contrast, no such effect was observed when the same distractors were presented in Katakana (e.g., "< ") pound, replicating Verdonschot and Kinoshita's original results (Experiment2). A phoneme-based effect was again found when the Katakana distractors used in Verdonschot and Kinoshita's original study were transcribed and presented in Romaji (Experiment3). Because the observation of a phonemic effectdirectly depended on the orthographic properties of the distractor stimuli, we conclude that the phonological Stroop task is also susceptible to orthographic influences

Phonological encoding in Vietnamese: An experimental investigation

In English, Dutch, and other Germanic languages the initial phonological unit used in word production has been shown to be the phoneme; conversely, others have revealed that in Chinese this is the atonal syllable and in Japanese the mora. The current paper is, to our knowledge, the first to report chronometric data on Vietnamese phonological encoding. Vietnamese, a tonal language, is of interest as, despite its Austroasiatic roots, it has clear similarities with Chinese through extended contact over a prolonged period. Four experiments (i.e., masked priming, phonological Stroop, picture naming with written distractors, picture naming with auditory distractors) have been conducted to investigate Vietnamese phonological encoding. Results show that in all four experiments both onset effects as well as whole syllable effects emerge. This indicates that the fundamental phonological encoding unit during Vietnamese language production is the phoneme despite its apparent similarities to Chinese. This result might have emerged due to tone assignment being a qualitatively different process in Vietnamese compared to Chinese

Acquisition of Word Spellings and Meanings during Reading in Nonnative Chinese Speakers

This dissertation explored the acquisition of word spellings (orthographic learning) and word meanings (incidental word learning) during reading in adult nonnative Chinese speakers. Two studies were designed for this dissertation. In Study One, 45 Chinese as a foreign language (CFL) learners at intermediate and advanced proficiency levels participated and completed a character learning experiment in a self-teaching paradigm. Results indicate that CFL learners were able to use the phonetic regularity and semantic transparency of radicals to learn the spellings and pronunciations of new characters after limited exposures to the characters in a story context. In Study Two, 72 CFL learners at novice, intermediate, and advanced proficiency levels were asked to choose the meanings of unfamiliar words presented either in isolation or in sentence context. Results show that CFL learners were more able to infer word meanings in context than in isolation, and such lexical inference ability improved with increasing Chinese proficiency levels. The findings of this dissertation reveal the underlying mechanism of orthographic learning and incidental word learning and yield implications for instruction of Chinese as a foreign language in adult learners

The proximate unit in Korean speech production: Phoneme or syllable?

We investigated the “proximate unit” in Korean, that is, the initial phonological unit selected in speech production by Korean speakers. Previous studies have shown mixed evidence indicating either a phoneme-sized or a syllable-sized unit. We conducted two experiments in which participants named pictures while ignoring superimposed non-words. In English, for this task, when the picture (e.g., dog) and distractor phonology (e.g., dark) initially overlap, typically the picture target is named faster. We used a range of conditions (in Korean) varying from onset overlap to syllabic overlap, and the results indicated an important role for the syllable, but not the phoneme. We suggest that the basic unit used in phonological encoding in Korean is different from Germanic languages such as English and Dutch and also from Japanese and possibly also Chinese. Models dealing with the architecture of language production can use these results when providing a framework suitable for all languages in the world, including Korean

Negative priming of novel shapes in younger and older adults : effects of time lags, stimulus repetition and stimulus luminosity

Three experiments explored the effects of age, stimulus salience, stimulus luminosity, time lags, and stimulus repetition on negative priming (NP) using unfamiliar novel shapes. No differences in NP were observed between younger and older adults, which counters the view that there is a general decline in inhibitory processes as we age (Hasher & Zacks, 1988). Long-term NP with novel shapes did not occur at either a five-minute or a 24-hour time interval, which challenges reports of long-term NP with once-presented novel shapes (Treisman & DeSchepper, 1996). The finding that NP was more likely to occur with stimulus repetition supported contentions about the importance of stimulus repetition (Strayer & Grison, 1999). Other results demonstrated the sensitivity of the NP effect to minor variations in the experimental conditions. Manipulating the relative salience of target and distractor stimuli increased distractor interference, but did not affect NP. However, reducing the luminosity of prime and probe display stimuli eliminated NP and produced facilitation (positive priming) instead. This facilitation occurred despite the repetition of stimuli, which had proven to enhance NP under different conditions. The present study challenges a number of conclusions about the nature of NP, but also suggests ways of bringing a measure of cohesion to apparently contradictory findings

Change blindness: eradication of gestalt strategies

Arrays of eight, texture-defined rectangles were used as stimuli in a one-shot change blindness (CB) task where there was a 50% chance that one rectangle would change orientation between two successive presentations separated by an interval. CB was eliminated by cueing the target rectangle in the first stimulus, reduced by cueing in the interval and unaffected by cueing in the second presentation. This supports the idea that a representation was formed that persisted through the interval before being 'overwritten' by the second presentation (Landman et al, 2003 Vision Research 43149–164]. Another possibility is that participants used some kind of grouping or Gestalt strategy. To test this we changed the spatial position of the rectangles in the second presentation by shifting them along imaginary spokes (by ±1 degree) emanating from the central fixation point. There was no significant difference seen in performance between this and the standard task [F(1,4)=2.565, p=0.185]. This may suggest two things: (i) Gestalt grouping is not used as a strategy in these tasks, and (ii) it gives further weight to the argument that objects may be stored and retrieved from a pre-attentional store during this task