The Mental Lexicon - Volume 12, Issue 2, 2017

Research has shown that, in English, the mapping between a word’s form and its syntactic category is not entirely arbitrary. Though formal differences between lexical categories are subtle, adults are sensitive to them and access this knowledge when retrieving or manipulating grammatical category information. Studies of form typicality have so far exclusively investigated unambiguous (or disambiguated) wordforms. We test the prediction that form typicality also affects visual processing of ambiguous wordforms, with formal features correlating, not with a form’s designation as a particular category, but with a form’s probability of being used as a particular category. Our results indicate that “form discrepancy”, a measure of how well a form’s category usage matches up with its form (i.e. typically nouny forms associated with high probability of usage as a noun), is a significant predictor of lexical decision response time. These data are in line with models in which category is not specified for roots in the lexicon but rather assigned within syntactic or semantic context, and show that distributional information about grammatical category usage is automatically accessed in visual word processing.

Previous work has shown that novel morphologically complex words (henceforth neologisms) leave traces in memory after just one encounter. This study addressed the question whether these traces are abstract in nature or exemplars. In three experiments, neologisms were either primed by themselves or by their stems. The primes occurred in the visual modality whereas the targets were presented in the auditory modality (Experiment 1) or vice versa (Experiments 2 and 3). The primes were presented in sentences in a selfpaced reading task (Experiment 1) or in stories in a listening comprehension task (Experiments 2 and 3). The targets were incorporated in lexical decision tasks, auditory or visual (Experiment 1 and Experiment 2, respectively), or in stories in a self-paced reading task (Experiment 3). The experimental part containing the targets immediately followed the familiarization phase with the primes (Experiment 1), or after a one week delay (Experiments 2 and 3). In all experiments, participants recognized neologisms faster if they had encountered them before (identity priming) than if the familiarization phase only contained the neologisms’ stems (stem priming). These results show that the priming effects are robust despite substantial differences between the primes and the targets. This suggests that the traces novel morphologically complex words leave in memory after just one encounter are abstract in nature.

There is an on-going debate about how the language system handles expressions that may refer to different word senses. Some theories propose derivational operations triggered by a type-mismatch; others assume underspecified lexical representations that engage in sense selection. Previous studies yielded mixed evidence. To further understand the diverse results and to tease apart type conflicts from sense selection, we conducted an ERP study on one type of metonymy using question-answer pairs. We capitalized on the fact that the metonymic relation could be anticipated by a wh-word, yielding a type clash between the wh-word and the predicate that cannot be resolved in the question (Whom did she read? vs. What did she read?) – in contrast to the answer (She read Brecht.). These conditions were contrasted with a non-metonymic reading. The results revealed a pronounced N400 at the verb of the whom-question in contrast to the questions without a type clash, and no reliable differences at the artist’s name in the answer. We therefore argue for an underspecification account for this metonymy-type which is not preceded by the detection of a type conflict. In comparison with other metonymy-types, this substantiates a classification of sense alternations into sense selection and sense creation.

Background: Formulaic expressions, including idioms and other fixed expressions, comprise a significant proportion of discourse. Although much has been written about this topic, controversy remains about their psychological status. An important claim about formulaic expressions, that they are known to native speakers, has seldom been directly demonstrated. This study tested the hypothesis that formulaic expressions are known and stored as whole unit mental representations by performing three perceptual experiments.

Method: Listeners transcribed two kinds of spectrally-degraded spoken sentences, half formulaic, and half novel, newly created expressions, matched for grammar and length. Two familiarity ratings, usage and exposure, were obtained from listeners for each expression. Text frequency data for the stimuli and their constituent words were obtained using a spoken corpus.

Results: Participants transcribed formulaic more successfully than literal utterances. Usage and familiarity ratings correlated with accuracy, but formulaic utterances with low ratings were also transcribed correctly. Phrase types differed significantly in text frequency, but word frequency counts did not differentiate the two kinds of expressions.

Discussion: These studies provide new converging evidence that formulaic expressions are encoded and processed as whole units, supporting a dual-process model of language processing, which assumes that grammatical and formulaic expressions are differentially processed.

Psycholinguistic researchers identify linguistic variables and assess if they affect cognitive processes. One such variable is letter bigram frequency, or the frequency with which a given letter pair co-occurs in an orthography. While early studies reported that bigram frequency affects visual lexical decision, subsequent, well-controlled studies not shown this effect. Still, researchers continue to use it as a control variable in psycholinguistic experiments. We propose two reasons for the persistence of this variable: (1) Reporting no significant effect of bigram frequency cannot provide evidence for no effect. (2) Despite empirical work, theoretical implications of bigram frequency are largely neglected. We perform Bayes Factor analyses to address the first issue. In analyses of existing large-scale databases, we find no effect of bigram frequency in lexical decision in the British Lexicon Project, and some evidence for an inhibitory effect in the English Lexicon Project. We find strong evidence for an effect in reading aloud. This suggests that, for lexical decision, the effect is unstable, and may depend on item characteristics and task demands rather than reflecting cognitive processes underlying visual word recognition. We call for more consideration of theoretical implications of the presence or absence of a bigram frequency effect.