Abstract
Across languages, certain phonological patterns are preferred to others (e.g., blog > lbog). But whether such preferences arise from abstract linguistic constraints or sensorimotor pressures is controversial. We address this debate by examining the constraints on doubling (e.g., slaflaf, generally, XX). Doubling demonstrably elicits conflicting responses (aversion or preference), depending on the linguistic level of analysis (phonology vs. morphology). Since the stimulus remains unchanged, the shifting responses imply abstract constraints. Here, we ask whether these constraints apply online, in eye movements. Experiment 1 shows that, in bare phonological forms, doubling is dispreferred, and correspondingly it elicits shorter fixations. Remarkably, when doubling signals morphological plurality, the aversion shifts into preference, in Experiment 2. Our results demonstrate for the first time that the constraints on doubling apply online. These findings are consistent with the hypothesis that phonological knowledge arises, in part, from an abstract linguistic source.