Phonological Activation in Multi-syllabic Sord Recognition

Previous studies have reported that semantic richness facilitates visual word recognition (see, e.g., Buchanan, Westbury, & Burgess, 2001; Pexman, Holyk, & Monfils, 2003). We compared three semantic richness measures--number of semantic neighbors (NSN), the number of words appearing in similar lexical contexts; number of features (NF), the number of features listed for a word's referent; and contextual dispersion (CD), the distribution of a word's occurrences across content areas-to determine their abilities to account for response time and error variance in lexical decision and semantic categorization tasks. NF and CD accounted for unique variance in both tasks, whereas NSN accounted for unique variance only in the lexical decision task. Moreover, each measure showed a different pattern of relative contribution across the tasks. Our results provide new clues about how words are represented and suggest that word recognition models need to accommodate each of these influences.

Automatic activation of phonology in visual word recognition has been well documented. It has been attributed, at least in part, to the sequential development of speech and literacy which results in the tendency for children to match orthographical input to phonological representation at the early stages of literacy development (e.g., Bosman & De Groot, 1996; Davis, Castles, & Iakovidis, 1998; Goswami, 1993). In contrast to the development of speech prior to literacy in first language (L1) acquisition, second language (L2) learners typically learn to speak and read at the same time. This raises the question of whether phonology is also automatically activated in L2 reading. This issue was investigated in this study by exploring the pseudohomophone effect in L2 reading using a lexical decision task. The role of learners’ L1 was also examined by including both alphabetic and non-alphabetic learners of English as L2. A strong pseudohomophone effect was found in reaction time among native English speakers and alphabetic non-native speakers. Non-alphabetic learners, however, showed a pseudohomophone effect in error rate but not in reaction time. The findings were discussed in terms of how learning experiences and L1 background affect phonological activation in visual L2 word recognition.

Aging, alzheimer's disease, and word recognition: A review of the recent literature

Sereno, O'Donnell, and Sereno (2009) reported that words are recognized faster in a lexical decision task when their referents are physically large than when they are small, suggesting that "semantic size" might be an important variable that should be considered in visual word recognition research and modelling. We sought to replicate their size effect, but failed to find a significant latency advantage in lexical decision for "big" words (cf. "small" words), even though we used the same word stimuli as Sereno et al. and had almost three times as many subjects. We also examined existing data from visual word recognition megastudies (e.g., English Lexicon Project) and found that semantic size is not a significant predictor of lexical decision performance after controlling for the standard lexical variables. In summary, the null results from our lab experiment--despite a much larger subject sample size than Sereno et al.--converged with our analysis of megastudy lexical decision performance, leading us to conclude that semantic size does not matter for word recognition. Discussion focuses on why semantic size (unlike some other semantic variables) is unlikely to play a role in lexical decision.

This study examined how lexical properties, such as word frequency, word length, and morphological features, affect the word recognition of Korean Hangul among adult readers. Ninety-four native Korean students performed a lexical decision task on disyllabic and trisyllabic words and nonwords. Results of cross-classified and hierarchical linear modeling showed a significant frequency effect but null effects of word length and their interactions on word recognition. The null syllable effect might be contributable to the block structure of syllables, which does not require syllabic decomposition in recognition. Given that Chinese-derived Sino-Korean words account for about 70% of the Korean lexicon, morphological features embedded in the word were examined in order to further understand the morphological undercurrent of multisyllabic word recognition. Word type (bound-morphemic words vs. compound words), word origin (native or semi-native words vs. Chinese-derived words), and morphemic transparency (opaque morpheme vs. transparent morpheme) were significant predictors of the speed of visual word recognition. An analysis of frequency split showed that compound words and morpheme transparency facilitated word recognition for high frequency words, while the number of morphemes within the word, Korean native and semi-native words, and morphemic transparency facilitated word recognition for low frequency words. These results suggest that high and low frequency words function differently according to morphological information available within the multisyllabic word in visual word recognition in Hangul.

This study examines the factors affecting word recognition in a language with a consistent system to map letters into sounds; Spanish. The influence of semantics on the recognition of words in languages with inconsistent mappings, such as English, is well documented. Not much is known for other languages. A lexical decision task and two category verification tasks with varying levels of semantic complexity were used. In contrast to English, none of the semantic variables entered into the analyses had a significant impact on lexical decision latencies or errors. Imageability showed an influence on responses to both category verification tasks while the effect of connectivity was marginally significant in the category verification task with the greatest semantic complexity. Results indicate that word recognition decisions can be made without the involvement of central components of the semantic system. The role of semantics in word recognition in languages with consistent spelling systems will be discussed.

Previous studies have reported facilitatory effects of semantic richness on word recognition (e.g., Yap et al., 2012). These effects suggest that word meaning is an important contributor to lexical decision task (LDT) performance, but what are the effects of repeated LDT practice on these semantic contributions? The current study utilized data from the British Lexicon Project (BLP) in which 78 participants made lexical decision judgments for 28,730 words over 16 h. We used linear mixed effects to detect practice-driven changes in the explanatory variance accounted for by a set of lexical predictors that included numerous indices of relative semantic richness, including imageability, the number of senses and average radius of co-occurrence (ARC). Results showed that practice was associated with decreasing effects of predictors such as word frequency and imageability. In contrast, ARC effects were only slightly diminished with repeated practice, and effects of the number of senses and the age of acquisition were unaffected by practice. We interpret our results within a framework in which variables may dynamically influence lexical processing and the post-lexical decision making mechanisms that also contribute to LDT performance.

A common view in the reading literature is that words are often recognized by recourse to phonological recoding. The question addressed here concerns whether phonological recoding can be controlled, or whether it is computed (a) even when it is completely irrelevant to the task, and (b) can only hurt performance. Two Stroop type experiments are reported in which participants used a key press to indicate the print colour of an (irrelevant) letter string that sounded like a colour (e.g., BLOO). The sound of the colour word was always incongruent with the required response. Colour identification performance was impaired by the irrelevant letter strings relative to two baseline conditions. These results and others are consistent with the conclusion that a phonological code is computed under a variety of circumstances. The hypothesis that skilled readers transform print on the page into phonology in order to recognize words has been intensively pursued over the last several decades. Many investigators favor a single route model in which phonological coding is a necessary preliminary to visual recognition (e.g., Carello, Turvey, & Lukatela, 1992; Frost, 1998; Lukatela & Turvey, 1991, 1994; Perfetti, Zhang, & Berent, 1992; Pexman & Lupker, 1995; Van Orden et al. 1992; Van Orden, Pennington & Stone, 1990). Other investigators argue in favor of the co-existence of a reading routine that activates lexical/semantic knowledge without prior phonological computation. This orthographic route operates in parallel with the phonological route (e.g., Baluch & Besner, 1991; Besner & Smith, 1992; Buchanan & Besner, 1993; Carr & Pollatsek, 1985; Coltheart, Curtis, Atkins, & Haller, 1993; Coltheart & Rastle, 1994; Davelaar, Coltheart, Jonasson & Besner, 1978; Herdman & Beckett, 1996; Paap, Noel & Johansen 1992; Plaut, McClelland, Seidenberg & Patterson, 1996; Waters & Seidenberg, 1985). How Controllable Is Phonological Computation? One consequence of the persistent report of phonological effects in visual recognition (e.g., spelling-sound regularity, homophone, and pseudohomophone effects) is a wide spread interest in a related but distinct issue that is the focus of the present investigation. That is, to what extent can the computation of a phonological code be thought of as a controllable set of processes given a printed input, as distinct from the issue of whether it is possible to exert any control over whether the products of phonological coding are used in making decisions about a response? Clearly, failing to find an effect of a phonological manipulation in some task speaks more directly to the latter issue than it does to the former because it might not be possible to control whether a phonological code is computed, but possible to control whether the products of such coding are used in formulating a response. In that vein, some investigators emphasize that there are stimulus and contextual manipulations which encourage participants to rely on the products of a nonphonological pathway in tasks like perceptual identification, naming, lexical decision, and semantic categorization (e.g., Baluch & Besner, 1991; Besner, Twilley, McCann, & Seergobin, 1990; Davelaar, et al., 1978; Hawkins et al., 1976; Hudson & Bergman, 1985; Jared & Seidenberg, 1991; Paap et al., 1992; Seidenberg, Peterson, MacDonald, & Plaut, 1996; Tabossi & Laghi, 1992; Verstaen, Humphreys, Olson, & D'Ydewalle, 1996; Waters & Seidenberg, 1985). Other investigators take a stronger line and argue that the computation of phonology is obligatory, and even automatic (among many others, see Carello, Turvey, & Lukatela, 1992; Frost, 1997; Glushko, 1979; Katz & Frost, 1992; Lukatela & Turvey, 1994; Perfetti et al., 1992; Van Orden et al., 1992). For example: ...effect of phonological primes suggests a leading role in visual perception for a fast acting, automatic, assembled phonology. …

Most empirical work investigating the role of syllable frequency in visual word recognition has focused on the Spanish language, in which syllable frequency seems to produce a classic dissociation: inhibition in lexical decision tasks but facilitation in naming. In the present study, two experiments were run in German, using identical stimulus materials, in a lexical decision task and a naming task. In both tasks, there was an inhibitory effect for words with a high-frequency first syllable. This pattern of results, suggesting a stronger weight of lexical access in the naming process in German than in Spanish, is discussed with regard to the issue of stress assignment in the two languages and within the framework of word production models. Items, mean response latencies, and accuracy rates per item for both experiments can be downloaded from www.psychonomic.org/archive.

The impact of inverted text on visual word processing: An fMRI study

There is a strong relationship between reading and articulation (Lervåg & Hulme, 2009; Pan et al., 2011). Given the tight coupling of these processes, innovative approaches are needed to understand the intricacies associated with print-speech connections. Here we ran a series of tightly controlled experiments to examine the impact of mouth perturbations on silent reading. We altered the mouth, via somatosensory feedback, in several ways: (a) a large lollipop in the mouth (E1), (b) a candy stick (bite bar) held horizontally between the teeth (E2), and (c) lidocaine that served to numb the mouth (E3). Three tasks were completed: (a) picture categorization, (b) "spell" lexical decision (Spell-LDT; "does the letter string spell a real word, yes or no?"), and (c) "sound" lexical decision (Sound-LDT; "does the letter string sound like a real word, yes or no?"). Participants (N = 97; E1 = 27; E2 = 32; E3 = 38) completed each of the tasks two times: once with a somatosensory perturbation (lollipop, bite bar, or lidocaine) and once without. For each experiment, a linear mixed effects analysis was run. Overall, we found that the lollipop (E1) and lidocaine (E3) had some specific effects on word recognition (e.g., for "no" responses), particularly in the Spell-LDT, whereas the bite bar (E2) had no effect on word recognition. The picture categorization task was not impacted by any perturbations. These findings provide evidence that sensorimotor information is connected to reading. We discuss how these findings advance our understanding of a print-to-speech framework. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Lexical decision tasks have been used to study both shifts of attention and semantic processing in Parkinson's Disease (PD). Whereas other laboratories have reported normal levels of semantic priming among PD patients, our laboratory has reported abnormally large levels. In this study, two experiments were performed to determine the influence of task structure on the extent of semantic priming during lexical decision-making and pronunciation tasks among PD patients and neurologically healthy controls. In Experiment 1, the effect of Prime Dominance (the ratio of category to neutral trials) on lexical decision-making was studied. Although equal numbers of word and nonword trials were presented, half of the PD patients and controls were studied under Category Prime Dominance (category : neutral prime ratio of 2:1) and half were studied under Neutral Prime Dominance (category : neutral prime ratio of 1:2). In Experiment 2, PD and control participants were studied on lexical decision-making and pronunciation tasks where twice as many words as nonword trials were presented, consistent with other studies from our laboratory. In Experiment 1, we found no group differences in the magnitude of priming and no effect of Prime Dominance. Moreover, the findings were similar in pattern and magnitude to results published by Neely (1977). In Experiment 2, we observed larger priming effects among PD patients than among controls, but only on the lexical decision (LD) task. These results support the hypothesis that abnormally large category-priming effects appear in LD studies of PD patients when the number of word trials exceeds the number of nonword trials. Furthermore, increased lexical priming in PD appears to be due to processes operating during the decision-making period that follows presentation of the lexical target.

This study examined the effect of neighborhood size on the recognition of Japanese katakana words. Neighbors of a given katakana word were defined in two ways; kana-level neighbor is a katakana word that can be constructed by changing one letter of the target word preserving the other letter positions, and phoneme-level neighbor is a katakana word that can be created by changing one phoneme (consonant or vowel) preserving the other phoneme positions of the target. In Experiment 1, 30 university students participated in a lexical decision task and numbers of kana-level neighbor were manipulated. The result showed that the number of kana-level neighbor had an inhibitory effect on lexical decision of low familiarity katakana words. In Experiment 2, 30 university students participated in a lexical decision task and numbers of phoneme-level neighbor were manipulated. The result showed that the number of phoneme-level neighbor had no effect on lexical decision of katakana words. These results suggest that neighbors affect each other on their orthographic representation in the recognition of low familiarity Japanese katakana words.

During a lexical decision task, lexical decision making can be distinguished from lexical retrieval. Lexical decision making is independent of stimulus modality and not reflected in the decision times, whereas the opposite holds for lexical retrieval. In neuroimaging studies investigating lexical decision tasks with either visual or auditory stimuli these two processes have so far been confused. Therefore, it is not clear whether the activation of Broca's region, consisting of the left Brodmann's area (BA) 44 and BA 45, reported in such studies really reflects lexical decision making. The present event-related fMRI study investigated the role of Broca's region in lexical decision by analyzing brain activation that is independent of stimulus modality or decision times. Twenty-two healthy participants performed lexical decisions on visual and auditory real words and pseudo-words. The left BA 44 was conjointly activated during visual and auditory lexical decisions as compared to rest indicating the modality-independent involvement of BA 44 in lexical decision tasks in general. To identify brain activation related to lexical decision making rather than lexical retrieval the decision times were entered as covariates into the fMRI analysis. In this analysis, the left BA 44 was activated for visual and for auditory lexical decision making. These results indicate that the left BA 44 as a distinct sub-part of Broca's region plays an important role in lexical decision making independently of stimulus modality and decision times.

To what extent does semantic information play a functional role in visual word recognition? Theories of word recognition vary in the importance assigned to semantic information in visual lexical decision, with past research suggesting that the nature of the foils is a crucial determinant of semantic reliance. Here, we explored the conditions under which semantic variables influence lexical decision. Normal readers performed visual lexical decision tasks in which imageability and semantic priming were manipulated, with nonword foils varying systematically in their orthographic and phonological similarity to the real words. The effects of imageability and semantic priming increased in magnitude as nonword foils became progressively more wordlike. These findings provide a clear illustration of the flexible use of semantic information to support normal visual word recognition.