My collaborators and I have a new paper out in Applied Psycholinguistics. This study examines word processing in Finnish speakers in order to explore questions about the factors that influence the speed of lexical recognition. Finnish provides a unique opportunity to investigate stem allomorphy, which is variation in word stems across different forms of the word, such as foot and feet in English. Finnish has rich stem allomorphy, with some words consisting of 3 or 4 stem allomorphs.
In a previous paper, Nikolaev et al. (2014) showed that words with higher stem allomorphy were recognized more quickly than words with lower stem allomorphy. However, there was a confound with allomorphy in that words with higher stem allomorphy tend to come from an unproductive inflectional class (in other words, new words are not created using those word forms) while words with lower stem allomorphy tend to come from a productive inflectional class. In the newly published study, we sought to disentangle the effects of stem allomorphy and inflectional productivity by including a third type of words which has low stem allomorphy but comes from an unproductive class.
The results replicated Nikolaev et al. (2014), showing that participants recognized words with higher stem allomorphy faster than words with lower stem allomorphy. Furthermore, we ruled out the potential contribution of productivity of inflectional class as a predictor of word recognition speed.
This study provided the basis for two follow-up studies. In the first, we compared healthy older adults and people with Mild Cognitive Impairment and Alzheimer’s dementia to determine whether the factors affecting word recognition (including stem allomorphy) change in pathological aging. This paper is currently under a second round of reviews at Cortex. The second study examines cortical structure in the same older adult groups and their relation to the processing of stem allomorphy differences. This paper is currently in preparation.
For a free PDF of the article, click here.