Orthographic constraints and frequency effects in complex word identification

Item does not contain fulltextIn an experimental study we explored the role of word frequency and orthographic constraints in the reading of Dutch bisyllabic words. Although Dutch orthography is highly regular, several deviations from a one-to-one correspondence occur. In polysyllabic words, the grapheme E may represent three different vowels: /ε /, /e/, or /œ /. In the experiment, skilled adult readers were presented lists of bisyllabic words containing the vowel E in the initial syllable and the same grapheme or another vowel in the second syllable. We expected word frequency to be related to word latency scores. On the basis of general word frequency data, we also expected the interpretation of the initial syllable as a stressed /e/ to be facilitated as compared to the interpretation of an unstressed /œ /. We found a strong negative correlation between word frequency and latency scores. Moreover, for words with E in either syllable we found a preference for a stressed /e/ interpretation, indicating a lexical frequency effect. The results are discussed with reference to a parallel dual-route model of word decoding.11 p

Learnability of graphotactic rules in visual word identification

Item does not contain fulltextBesides phonotactic principles, orthographies entail graphotactic rules for which the reader must convert a phonological representation on the basis of spelling adaptation rules. In the present study, the learnability of such rules will be investigated with reference to Dutch. Although Dutch orthography can be considered highly regular, there are graphotactic rules that change letter sequences in plural noun formation. In a lexical decision experiment, the acquisition and use of such rules were examined. Participants were groups of 31 children from Grade 3 and 34 children from Grade 6, and 25 adults. The results showed that both children and adults are significantly less accurate and slower in recognizing plural word forms which undergo vowel change as a consequence of pluralization. It is concluded that graphotactic rules in Dutch orthography complicate Dutch word identification from an early stage of development and continue to play a complicating role in the word identification process of adult readers. In the discussion it is shown that current models fail to fully explain the processing of graphotactic rules in visual word identification.11 p

Units of analysis in reading Dutch bisyllabic pseudowords

Item does not contain fulltextTwo experiments were carried out to explore the units of analysis used by children to read Dutch bisyllabic pseudowords. Although Dutch orthography is highly regular, several deviations from a one-to-one correspondence occur. In polysyllabic words, the grapheme e may represent three different vowels: /ε/, /e/, or /∂/. In Experiment 1, Grade 6 elementary school children were presented lists of bisyllabic pseudowords containing the grapheme e in the initial syllable representing a content morpheme, a prefix, or a random string. On the basis of general word frequency data, we expected the interpretation of the initial syllable as a random string to elicit the pronunciation of a stressed /e/, the interpretation of the initial syllable as a content morpheme to elicit the pronunciation of a stressed /ε/, and the interpretation as a prefix to elicit the pronunciation of an unstressed /∂/. We found both the pronunciation and the stress assignment for pseudowords to depend on word type, which shows morpheme boundaries and prefixes to be identified. However, the identification of prefixes could also be explained by the correspondence of the prefix boundaries in the pseudowords to syllable boundaries. To exclude this alternative explanation, a follow-up experiment with the same group of children was conducted using bisyllabic pseudowords containing prefixes that did not coincide with syllable boundaries versus similar pseudowords with no prefix. The results of the first experiment were replicated. That is, the children identified prefixes and shifted their assignment of word stress accordingly. The results are discussed with reference to a parallel dual-route model of word decoding

Predictors of aortic growth in uncomplicated type B aortic dissection from the Acute Dissection Stent Grafting or Best Medical Treatment (ADSORB) database

Background: The high-risk patient cohort of uncomplicated type B aortic dissections (uTBADs) needs to be clarified. We compared uTBAD patients treated with best medical treatment (BMT), with and without aortic growth, from the Acute Dissection Stent Grafting or Best Medical Treatment (ADSORB) trial database. Furthermore, we looked for trends in outcome for aortic growth and remodeling after BMT and thoracic endovascular aortic repair (TEVAR) and BMT (TEVAR+BMT). Methods: BMT patients with available baseline and a 1-year follow-up arterial computed tomography scan were identified. True lumen and false lumen diameter was assessed at baseline and at follow-up. Patients with false lumen growth (group I) and without false lumen growth (group II) were compared. Predictors of false lumen and total lumen (aortic) growth were identified. Lastly, BMT outcomes were compared with BMT+TEVAR for false lumen thrombosis and change in false lumen and total aortic diameter in four sections: 0 to 10 cm (A), 10 to 20 cm (B), 20 to 30 cm (C), and 30 to 40 cm (D) from the left subclavian artery. Results: The dissection was significantly longer in group I than in group II (43.2 \ub1 4.9 cm vs 30.4 \ub1 8.8 cm; . P = .002). The number of vessels originating from the false lumen at baseline was identified as an independent predictor of false lumen growth (odds ratio, 22.1; 95% confidence interval, 1.01-481.5; . P = .049). Increasing age was a negative predictor of total aortic diameter growth (odds ratio, 0.902; 95% confidence interval, 0.813-1.00; . P = .0502). The proximal sections A and B showed complete thrombosis in 80.6% in the BMT+TEVAR group compared with 9.5% in the BMT group. In these sections, changes from patent to partial or partial to complete thrombosis were observed in 90.3% of the TEVAR+BMT group vs 31.0% in the BMT group. In sections C and D, the change in thrombosis was 74.1% for the TEVAR+BMT group vs 20.6% for the BMT group. The false lumen diameter increase at section C was larger in the BMT group. Total lumen diameter decreased in sections A and B in the TEVAR+BMT group compared with an increase in the BMT group (-4.8 mm vs +2.9 mm, and -1.5 mm vs +3.8 mm, respectively). Sections C and D showed minimal and comparable expansion in both treatment groups. Conclusions: The new imaging analysis of the ADSORB trial patients identified the number of vessels originating from the false lumen as an independent predictor of false lumen growth in uTBAD patients. Increasing age was a negative predictor of aortic growth. Our analysis may help to identify which uTBAD patients are at higher risk and should receive TEVAR or be monitored closely during follow-up