Daragh E. Sibley

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Empirical work and models of visual word recognition have traditionally focused on group-level performance. Despite the emphasis on the prototypical reader, there is clear evidence that variation in reading skill modulates word recognition performance. In the present study, we examined differences among individuals who contributed to the English Lexicon(More)
We employed brain-behavior analyses to explore the relationship between performance on tasks measuring phonological awareness, pseudoword decoding, and rapid auditory processing (all predictors of reading (dis)ability) and brain organization for print and speech in beginning readers. For print-related activation, we observed a shared set of skill-correlated(More)
The forms of words as they appear in text and speech are central to theories and models of lexical processing. Nonetheless, current methods for simulating their learning and representation fail to approach the scale and heterogeneity of real wordform lexicons. A connectionist architecture termed the sequence encoder is used to learn nearly 75,000 wordform(More)
Four pairs of connectionist simulations are presented in which quasi-regular mappings are computed using localist and distributed representations. In each simulation, a control parameter termed input gain was modulated over the only level of representation that mapped inputs to outputs. Input gain caused both localist and distributed models to shift between(More)
Two primary methods have been used in studies of word reading: small-scale factorial studies and larger scale “megastudies” involving thousands of words. We conducted comparisons between the two, using the standard frequency X regularity interaction in word naming as test case. Whereas the effect replicates across small-scale studies, somewhat different(More)
Sibley, Kello, Plaut, and Elman (2008) proposed the sequence encoder as a model that learns fixed-width distributed representations of variable-length sequences. In doing so, the sequence encoder overcomes problems that have restricted models of word reading and recognition to processing only monosyllabic words. Bowers and Davis (in press) recently claimed(More)
The purpose of the study was to investigate relationships among maternal age, maternal prenatal attachment, perception of birth experience, and maternal role attainment. The sample consisted of Black and Caucasian low-income women. Twenty adolescents, 16 years and younger, and 32 adult pregnant women, 21 years and older, completed Cranley's (1981) Prenatal(More)
Two connectionist models are reported that simulated the defining features of the double dissociation between phonological and surface dyslexia in word reading. One model was a feed-forward, three-layer perceptron, and the other included recurrent connections. Neither model contained an architectural separation of sublexical and lexical processes, nor of(More)
Researchers have extensively documented how various statistical properties of words (e.g., word frequency) influence lexical processing. However, the impact of lexical variables on nonword decision-making performance is less clear. This gap is surprising, because a better specification of the mechanisms driving nonword responses may provide valuable(More)