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ERIC Number: EJ825161
Record Type: Journal
Publication Date: 2009-Jan
Pages: 6
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0278-7393
Additive and Interactive Effects of Stimulus Degradation: No Challenge for CDP+
Ziegler, Johannes C.; Perry, Conrad; Zorzi, Marco
Journal of Experimental Psychology: Learning, Memory, and Cognition, v35 n1 p306-311 Jan 2009
S. O'Malley and D. Besner (2008) showed that additive effects of stimulus degradation and word frequency in reading aloud occur in the presence of nonwords but not in pure word lists. They argued that this dissociation presents a major challenge to interactive computational models of reading aloud and claimed that no currently implemented model is able to simulate additive effects in these conditions. In the current article, it is shown that the connectionist dual process model (CDP+) can simulate these effects because its nonlexical route is thresholded. The authors present a series of simulations showing that CDP+ can not only simulate the precise dissociation observed by O'Malley and Besner but more generally can produce additive effects for a wide range of parameter combinations and different sets of items. The nonlexical route of CDP+ was not modified post hoc to deal with the effects of stimulus quality, but it had been thresholded for principled reasons before it was known that these effects existed. Together, the effects of stimulus quality on word frequency do not challenge CDP+ but rather provide unexpected support for its architecture and processing dynamics.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A