Introduction

The above quotes from Chomsky and Sampson exemplify the controversial status of speakers’ intuitions, i.e. introspection data, in modern linguistics: while speakers’ intuitions form the prime data source for Chomskyan generative linguists, researchers like Sampson deny that introspection can yield any scientific data. As Schütze (1996) has shown, many points of criticism with respect to introspection data are in fact warranted (such as, e.g., that linguists often produce theory and data at the same time). However, he also pointed out that the vast majority of these problems have to do with the fact that this data type is often elicited in an unscientific way. If collected in carefully constructed experimental settings, on the other hand, introspection can yield data that meets the standard criteria for scientific data (Schütze 1996; Cowart 1997). In particular, Magnitude Estimation, an experimental paradigm originally employed in psychophysics (Stevens 1975), has been argued to offer a way to gather and interpret introspection data in a valid, reliable and objective way (cf. Bard, Robertson and Sorace 1996; Keller 2000; Sorace and Keller 2005).