The influence of the place-value structure of the Arabic number ...

variable standard the strictly decomposed model produced the data that fitted the empirical
data best. However, not only did the decomposed model produce the most realistic data
pattern, its RT estimates also reflected specific characteristics previously assumed to be
determined by the holistic part of the hybrid model. In this context, regression analysis
showed that a predictor representing a measure of (logarithmic) overall distance between the
to-be-compared numbers accounted for a reliable part of the variance even though there is no
unitary representation of overall distance in the strictly decomposed model. Interestingly, the
inclusion of such a predictor was one reason for Nuerk, Weger, & Willmes (2001; Nuerk and
Willmes, 2005) to propose a holistic number magnitude representation apart from
representations coding the magnitudes of its constituting digits. Taken together, analysing the
computational model data implies that the standard effects of numerical cognition on
symbolic digital input can be accounted for by a model proposing the strictly decomposed
representation of units, tens, hundreds, etc.
After having summarized the most important aspects of the individual studies
presented in the current thesis, these so far separate lines of evidence shall be consolidated
and discussed in the General Discussion section.
294